From 6e3e8e9b69fc5a069f6d96f1cd55605f23d07d47 Mon Sep 17 00:00:00 2001
From: Raimon Zamora <jaildoctor@gmail.com>
Date: Wed, 23 Jul 2025 13:51:51 +0200
Subject: [PATCH] =?UTF-8?q?-=20[FIX]=20Corregit=20el=20acces=20als=20port?=
 =?UTF-8?q?=20amb=20OUT=20-=20[NEW]=20Nou=20model=20de=20gesti=C3=B3=20de?=
 =?UTF-8?q?=20mem=C3=B2ria?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 main.cpp             |  27 ++++----
 z80.cpp              |  27 ++++----
 z80analyze.cpp       |  10 +--
 z80debug.cpp         |  54 +++++++--------
 z80dis.cpp           |  46 ++++++-------
 z80mem.cpp           |   2 +
 z80mem.h             |   2 +
 zx_128bankviewer.cpp |   8 ++-
 zx_128mem.cpp        |   2 +
 zx_128mem.h          |   2 +
 zx_128pageviewer.cpp |   4 +-
 zx_48mem.cpp         |   4 +-
 zx_48mem.h           |   2 +
 zx_mem.cpp           | 161 +++++++++++++++++++++++++++++++++++++++++++
 zx_mem.h             |  44 ++++++++++++
 zx_screen.cpp        |  14 ++--
 16 files changed, 315 insertions(+), 94 deletions(-)
 create mode 100644 zx_mem.cpp
 create mode 100644 zx_mem.h

diff --git a/main.cpp b/main.cpp
index 9888863..6011e2d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -12,14 +12,14 @@
 #include "ui_menu.h"
 #include "z80analyze.h"
 #include "ui_window.h"
-#include "z80mem.h"
-#include "zx_48mem.h"
-#include "zx_128mem.h"
+#include "zx_mem.h"
+//#include "zx_48mem.h"
+//#include "zx_128mem.h"
 #include "z80viewer.h"
-#include "zx_128bankviewer.h"
-#include "zx_128pageviewer.h"
+//#include "zx_128bankviewer.h"
+//#include "zx_128pageviewer.h"
 
-uint8_t memory[65536];
+//uint8_t memory[65536];
 uint32_t time = 0;
 uint32_t t_states = 0;
 
@@ -82,7 +82,8 @@ int main(int argc, char *argv[])
     const uint32_t update_freq = clock / 10;
 
     //new zx_48mem();
-    new zx_128mem();
+    //new zx_128mem();
+    mem::init(ZX_128K);
 
     z80dis::loadSymbols();
     z80::reset();
@@ -93,13 +94,13 @@ int main(int argc, char *argv[])
     //zxscreen::init(SCREEN_MODE_48K);
     zxscreen::init(SCREEN_MODE_128K);
 
-    z80viewer *v = new zx_128bankviewer();
-    v->show();
-    z80viewer::registerViewer("128BANK", v);
+    //z80viewer *v = new zx_128bankviewer();
+    //v->show();
+    //z80viewer::registerViewer("128BANK", v);
 
-    v = new zx_128pageviewer();
-    v->show();
-    z80viewer::registerViewer("128PAGE", v);
+    //v = new zx_128pageviewer();
+    //v->show();
+    //z80viewer::registerViewer("128PAGE", v);
 
     ui::menu::init();
     ui::menu::setexitcallback(actions::exitMenu);
diff --git a/z80.cpp b/z80.cpp
index fcd46a2..e950d70 100644
--- a/z80.cpp
+++ b/z80.cpp
@@ -1,6 +1,6 @@
 #include "z80.h"
 #include "z80debug.h"
-#include "z80mem.h"
+#include "zx_mem.h"
 //#include "zx_tape.h"
 #include <stdio.h>
 
@@ -153,14 +153,14 @@ namespace z80
     {
         if (z80debug::isbreak(addr, 2)) z80debug::stop();
         t+=3;
-        const uint8_t tag = z80mem::get()->getTag(addr);
+        const uint8_t tag = mem::getTag(addr);
         if ( !(tag&MEMTAG_IGNORE) ) {
             if (!code) {
                 if ( tag & MEMTAG_INST ) {
                     //printf("WARNING! READING DATA FROM CODE!!! $%4X\n", addr);
                     //z80debug::stop();
                 } else {
-                    z80mem::get()->setTag(addr, tag | MEMTAG_DATA);
+                    mem::setTag(addr, tag | MEMTAG_DATA);
                 }
             } else {
                 if ( (reading_m1) && ( tag & MEMTAG_DATA ) ) {
@@ -170,14 +170,14 @@ namespace z80
             }
         }
         reading_m1 = false;
-        return z80mem::get()->readMem(addr);
+        return mem::readMem(addr);
     }
 
     uint8_t READ_MEM_8()
     {
         const uint8_t data = READ_MEM_8(rPC, true);
-        const uint8_t tag = z80mem::get()->getTag(rPC);
-        if ( !(tag & MEMTAG_IGNORE) ) z80mem::get()->setTag(rPC, tag | MEMTAG_CODE);
+        const uint8_t tag = mem::getTag(rPC);
+        if ( !(tag & MEMTAG_IGNORE) ) mem::setTag(rPC, tag | MEMTAG_CODE);
         rPC++;
         return data;
     }
@@ -208,18 +208,18 @@ namespace z80
     const uint8_t WRITE_MEM_8(const uint16_t addr, const uint8_t value)
     {
         t+=3;
-        if (addr>=0x4000) z80mem::get()->writeMem(addr, value);
+        if (addr>=0x4000) mem::writeMem(addr, value);
         if (z80debug::isbreak(addr, 4)) z80debug::stop();
         //if (z80debug::debugging())
         z80debug::setmemmodified(addr);
 
-        const uint8_t tag = z80mem::get()->getTag(addr);
+        const uint8_t tag = mem::getTag(addr);
         if ( !(tag & MEMTAG_IGNORE) ) {
             if ( tag & MEMTAG_INST ) {
                 //printf("WARNING! WRITING DATA OVER CODE!!! $%4X\n", addr);
                 //z80debug::stop();
             } else {
-                z80mem::get()->setTag(addr, tag | MEMTAG_DATA | MEMTAG_TDATA);
+                mem::setTag(addr, tag | MEMTAG_DATA | MEMTAG_TDATA);
             }
         }
 
@@ -1008,7 +1008,8 @@ namespace z80
         t+=4;
         if (port == 0x10000) {
             port = rBC;
-            if (rC==0xfe) port = 0xfe;
+        } else {
+            port = (rA<<8) | port;
         }
         if (out_ports[port&0xff]) out_ports[port&0xff](port, val);
     }
@@ -1125,7 +1126,7 @@ namespace z80
             out_ports[i] = nullptr;
         }
 
-        z80mem::get()->reset();
+        mem::reset();
 
         rPC = iff1 = iff2 = im = 0;
         rAF = rAF2 = rBC = rBC2 = rDE = rDE2 = rHL = rHL2 = rIX = rIY = rSP = 0xffff;
@@ -1164,10 +1165,10 @@ namespace z80
             t = 0;
             const uint8_t opcode = READ_M1();
 
-            uint8_t tag = z80mem::get()->getTag(current_opcode_address);
+            uint8_t tag = mem::getTag(current_opcode_address);
             if ( !(tag & MEMTAG_IGNORE) )
                 tag = tag | MEMTAG_INST;
-            z80mem::get()->setTag(current_opcode_address, tag | (!(tag&MEMTAG_TOUCHED) ? MEMTAG_TREPEAT : MEMTAG_TINST) );
+            mem::setTag(current_opcode_address, tag | (!(tag&MEMTAG_TOUCHED) ? MEMTAG_TREPEAT : MEMTAG_TINST) );
 
             uint16_t tmp;
             
diff --git a/z80analyze.cpp b/z80analyze.cpp
index ad151f2..6a05938 100644
--- a/z80analyze.cpp
+++ b/z80analyze.cpp
@@ -1,7 +1,7 @@
 #include "z80analyze.h"
 #include "z80.h"
 #include "z80debug.h"
-#include "z80mem.h"
+#include "zx_mem.h"
 #include <SDL2/SDL.h>
 #include "ui_window.h"
 #include "ui.h"
@@ -53,9 +53,9 @@ namespace z80analyze
                 z80debug::refresh();
                 */
             } else if (e->key.keysym.scancode == SDL_SCANCODE_BACKSPACE) {
-                const uint32_t size = z80mem::get()->getSize();
-                //for (int i=0; i<size; ++i) z80mem::get()->setTag(i, z80mem::get()->getTag(i) & ~MEMTAG_TOUCHED);
-                for (int i=0; i<size; ++i) z80mem::get()->setTag(i, MEMTAG_NONE);
+                const uint32_t size = mem::getSize();
+                //for (int i=0; i<size; ++i) mem::setTag(i, mem::getTag(i) & ~MEMTAG_TOUCHED);
+                for (int i=0; i<size; ++i) mem::setTag(i, MEMTAG_NONE);
                 refresh();
                 z80debug::refresh();
             }
@@ -102,7 +102,7 @@ namespace z80analyze
             //uint8_t tag = z80::getMemTag(i);
             //pixels[i] = tag==MEMTAG_NONE ? 0x808080 : tag==MEMTAG_DATA ? 0x0000FF : tag==MEMTAG_MIXED ? 0xFF00FF : 0x00FF00;
             uint32_t none_color = i<0x4000 ? 0x101010 : i<0x5800 ? 0x202020 : i<0x5b00 ? 0x404040 : 0x808080;
-            uint8_t tag = z80mem::get()->getTag(i);
+            uint8_t tag = mem::getTag(i);
             pixels[i] = !(tag & MEMTAG_TOUCHED) ? none_color : (tag & MEMTAG_TINST) ? 0x00FF00 : (tag & MEMTAG_TREPEAT) ? 0xFF0000 : 0x0000FF;
         }
         pixels[z80::getPC()] = 0xFFFFFF;
diff --git a/z80debug.cpp b/z80debug.cpp
index 85f6cc2..1c96f57 100644
--- a/z80debug.cpp
+++ b/z80debug.cpp
@@ -2,7 +2,7 @@
 #include <SDL2/SDL.h>
 #include "z80.h"
 #include "z80dis.h"
-#include "z80mem.h"
+#include "zx_mem.h"
 #include "z80analyze.h"
 #include "zx_ula.h"
 #include "zx_tape.h"
@@ -198,7 +198,7 @@ namespace z80debug
                         const int opcodesize = z80dis::getOpcodeSize(address);
                         const int byte = (chrx-19)/3;
                         if (byte < opcodesize) {
-                            inspected_value = z80mem::get()->readMem(address+byte);
+                            inspected_value = mem::readMem(address+byte);
                             refresh();
                         }
                     // Si pasa per damunt de l'adreça en el visor de memòria
@@ -208,7 +208,7 @@ namespace z80debug
                     // Si pasa per damunt d'un byte en el visor de memòria
                     } else if ((chrx>6) && (chrx<55) && (chry>mem_y) && (chry<mem_y+mem_h-1)) {
                         const uint16_t address = mem_viewer_pos + (chry-mem_y-1)*16 + (chrx-7)/3;
-                        inspected_value = z80mem::get()->readMem(address);
+                        inspected_value = mem::readMem(address);
                         refresh();
                     // Si pasa per damunt d'un registre
                     } else if ((chrx>=midx+4)  && (chrx<midx+8)  && (chry==1)) { inspected_value = z80::getAF(); refresh();
@@ -224,9 +224,9 @@ namespace z80debug
                     } else if ((chrx>=midx+20) && (chrx<midx+24) && (chry==3)) { inspected_value = z80::getSP(); refresh();
                     } else if ((chrx>=midx+20) && (chrx<midx+24) && (chry==4)) { inspected_value = z80::getPC(); refresh();
 
-                    } else if ((chrx>=midx+6)  && (chrx<midx+8)  && (chry==5)) { inspected_value = z80mem::get()->readMem(z80::getBC()); refresh();
-                    } else if ((chrx>=midx+14) && (chrx<midx+16) && (chry==5)) { inspected_value = z80mem::get()->readMem(z80::getDE()); refresh();
-                    } else if ((chrx>=midx+22) && (chrx<midx+24) && (chry==5)) { inspected_value = z80mem::get()->readMem(z80::getHL()); refresh();
+                    } else if ((chrx>=midx+6)  && (chrx<midx+8)  && (chry==5)) { inspected_value = mem::readMem(z80::getBC()); refresh();
+                    } else if ((chrx>=midx+14) && (chrx<midx+16) && (chry==5)) { inspected_value = mem::readMem(z80::getDE()); refresh();
+                    } else if ((chrx>=midx+22) && (chrx<midx+24) && (chry==5)) { inspected_value = mem::readMem(z80::getHL()); refresh();
 
                     } else if ((chrx>=midx+17) && (chrx<midx+19) && (chry==6)) { inspected_value = z80::getI(); refresh();
                     } else if ((chrx>=midx+22) && (chrx<midx+24) && (chry==6)) { inspected_value = z80::getR(); refresh();
@@ -393,10 +393,10 @@ namespace z80debug
     uint16_t find_previous_opcode(uint16_t pc)
     {
         pc--;
-        uint8_t tag = z80mem::get()->getTag(pc);
+        uint8_t tag = mem::getTag(pc);
         if ( !(tag & (MEMTAG_CODE | MEMTAG_INST) ) ) return pc;
 
-        while ( !(z80mem::get()->getTag(pc) & MEMTAG_INST) ) pc--;
+        while ( !(mem::getTag(pc) & MEMTAG_INST) ) pc--;
 
         return pc;
         /*
@@ -416,7 +416,7 @@ namespace z80debug
     void printDissasemblerLine(const uint16_t address, const int line, const bool heuristics=false)
     {
         uint8_t colors[4] = { COLOR_RED, COLOR_CYAN, COLOR_WHITE, COLOR_WHITE};
-        const uint8_t tag = z80mem::get()->getTag(address);
+        const uint8_t tag = mem::getTag(address);
         if ( !(tag & (MEMTAG_TINST | MEMTAG_TREPEAT)) ) colors[3]=COLOR_GRAY;
         if ( !(tag & MEMTAG_TOUCHED) ) colors[1]=COLOR_GRAY;
 
@@ -434,7 +434,7 @@ namespace z80debug
 
             const int opcodesize = z80dis::getOpcodeSize(address);
             for (int i=0; i<opcodesize; ++i) {
-                const uint8_t tag = z80mem::get()->getTag(address+i);
+                const uint8_t tag = mem::getTag(address+i);
                 const uint32_t color = !(tag & MEMTAG_KNOWN) ? COLOR_GRAY : (tag & MEMTAG_DATA) ? ( (tag & (MEMTAG_CODE|MEMTAG_INST)) ? COLOR_MAGENTA : COLOR_BLUE ) : COLOR_GREEN;
                 ui::printrect(19+i*3,line,2,1,color);
             }
@@ -443,7 +443,7 @@ namespace z80debug
             ui::printtxt(31,line, z80dis::getAsm(address), colors[3]);
         } else {
             ui::printrect(19,line,2,1,COLOR_GRAY);
-            ui::printtxt(19,line, tohex(z80mem::get()->readMem(address),2), COLOR_WHITE);
+            ui::printtxt(19,line, tohex(mem::readMem(address),2), COLOR_WHITE);
             ui::printtxt(31,line, "?????????", COLOR_GRAY);
         }
     }
@@ -517,9 +517,9 @@ namespace z80debug
         ui::printtxt(16,5, tohex(z80::getI(), 2), oI != z80::getI() ? COLOR_RED : COLOR_GRAY);
         ui::printtxt(21,5, tohex(z80::getR(), 2), oR != z80::getR() ? COLOR_RED : COLOR_GRAY);
 
-        ui::printtxt(5,4, tohex(z80mem::get()->readMem(z80::getBC()), 2), COLOR_GRAY);
-        ui::printtxt(13,4, tohex(z80mem::get()->readMem(z80::getDE()), 2), COLOR_GRAY);
-        ui::printtxt(21,4, tohex(z80mem::get()->readMem(z80::getHL()), 2), COLOR_GRAY);
+        ui::printtxt(5,4, tohex(mem::readMem(z80::getBC()), 2), COLOR_GRAY);
+        ui::printtxt(13,4, tohex(mem::readMem(z80::getDE()), 2), COLOR_GRAY);
+        ui::printtxt(21,4, tohex(mem::readMem(z80::getHL()), 2), COLOR_GRAY);
 
         const uint8_t flags = (z80::getAF() & 0xFF);
         const uint8_t mod_flags = flags ^ (oAF & 0xFF);
@@ -548,7 +548,7 @@ namespace z80debug
                 c1 = c2 = COLOR_YELLOW;
             }
             ui::printtxt(0,i, tohex(sp, 4), c1);
-            uint16_t value = z80mem::get()->readMem(sp) + (z80mem::get()->readMem(sp+1)<<8);
+            uint16_t value = mem::readMem(sp) + (mem::readMem(sp+1)<<8);
             ui::printtxt(5,i, tohex(value, 4), c2);
             sp+=2;
         }
@@ -622,12 +622,12 @@ namespace z80debug
             ui::printtxt(1,i, tohex(mem_viewer_cursor, 4), COLOR_CYAN);
             for (int j=0; j<16; ++j) {
 
-                const uint8_t tag = z80mem::get()->getTag(mem_viewer_cursor);
+                const uint8_t tag = mem::getTag(mem_viewer_cursor);
                 const uint32_t color = !(tag & MEMTAG_KNOWN) ? COLOR_GRAY : (tag & MEMTAG_DATA) ? ( (tag & (MEMTAG_CODE|MEMTAG_INST)) ? COLOR_MAGENTA : COLOR_BLUE ) : COLOR_GREEN;
                 ui::printrect(6+j*3,i,2,1,color);
                 ui::printrect(54+j,i,1,1,color);
-                ui::printtxt(6+j*3, i, tohex(z80mem::get()->readMem(mem_viewer_cursor), 2), ( tag & MEMTAG_MODIFIED) ? COLOR_RED : COLOR_WHITE);
-                ui::printchar(54+j, i, z80mem::get()->readMem(mem_viewer_cursor), ( tag & MEMTAG_MODIFIED) ? COLOR_BROWN : COLOR_GRAY);
+                ui::printtxt(6+j*3, i, tohex(mem::readMem(mem_viewer_cursor), 2), ( tag & MEMTAG_MODIFIED) ? COLOR_RED : COLOR_WHITE);
+                ui::printchar(54+j, i, mem::readMem(mem_viewer_cursor), ( tag & MEMTAG_MODIFIED) ? COLOR_BROWN : COLOR_GRAY);
                 mem_viewer_cursor++;
             }
             //printtxt(5,0, "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00", COLOR_WHITE);
@@ -881,11 +881,11 @@ namespace z80debug
             int address = getnum(cmd);
             getcmd();
             int value = getnum(cmd);
-            z80mem::get()->writeMem(address, value);
+            mem::writeMem(address, value);
         } else if (strcmp(cmd, "peek")==0) {
             getcmd();
             int address = getnum(cmd);
-            int value = z80mem::get()->readMem(address);
+            int value = mem::readMem(address);
             char tmp[10];
             sendToConsoleLog(SDL_itoa(value, tmp, 10));
         } else if (strcmp(cmd, "reg")==0) {
@@ -904,7 +904,7 @@ namespace z80debug
             getcmd();
             int address = getnum(cmd);
             if (address<0 || address>=65536) { sendToConsoleLog("Illegal address"); return; }
-            if ( !(z80mem::get()->getTag(address) & MEMTAG_INST) ) address = find_previous_opcode(address);
+            if ( !(mem::getTag(address) & MEMTAG_INST) ) address = find_previous_opcode(address);
             z80debug::setcursor(address);
         } else if (strcmp(cmd, "sym")==0 || strcmp(cmd, "symbol")==0) {
             getcmd();
@@ -956,7 +956,7 @@ namespace z80debug
         } else if (strcmp(cmd, "ignore")==0) {
             getcmd();
             const int address = getnum(cmd);
-            z80mem::get()->setTag(address, z80mem::get()->getTag(address) | MEMTAG_IGNORE);
+            mem::setTag(address, mem::getTag(address) | MEMTAG_IGNORE);
         } else if (strcmp(cmd, "search")==0) {
             getcmd();
             if (strcmp(cmd, "next")==0) {
@@ -1013,7 +1013,7 @@ namespace z80debug
         int size = ftell(f);
         fseek(f, 0, SEEK_SET);
         uint32_t memsize;
-        uint8_t *memory = z80mem::get()->getRawPointer(&memsize);
+        uint8_t *memory = mem::getRawPointer(&memsize);
         fread(memory+address, size, 1, f);
         fclose(f);
         z80::setPC(address);
@@ -1026,7 +1026,7 @@ namespace z80debug
         uint8_t *regs = z80::getRegs();
         FILE *f = fopen(filename, "wb");
         fwrite(regs, 31, 1, f);
-        z80mem::get()->saveState(f);
+        mem::saveState(f);
         fclose(f);
     }
 
@@ -1035,7 +1035,7 @@ namespace z80debug
         uint8_t *regs = z80::getRegs();
         FILE *f = fopen(filename, "rb");
         fread(regs, 31, 1, f);
-        z80mem::get()->loadState(f);
+        mem::loadState(f);
         fclose(f);
         history::store();
         history::gototop();
@@ -1044,7 +1044,7 @@ namespace z80debug
     void setcursor(const uint16_t address)
     {
         //if (!debugging()) return;
-        if ( !(z80mem::get()->getTag(address) & MEMTAG_INST) )
+        if ( !(mem::getTag(address) & MEMTAG_INST) )
             cursor = find_previous_opcode(address);
         else
             cursor = address;
@@ -1135,7 +1135,7 @@ namespace z80debug
         }
         int num_found=0;
         while (search_pos<65536) {
-            if (search_sequence[num_found] == z80mem::get()->readMem(search_pos)) {
+            if (search_sequence[num_found] == mem::readMem(search_pos)) {
                 num_found++; search_pos++;
                 if (num_found==search_sequence_len) {
                     mem_viewer_pos=search_pos-search_sequence_len;
diff --git a/z80dis.cpp b/z80dis.cpp
index 4f938f3..f385bf2 100644
--- a/z80dis.cpp
+++ b/z80dis.cpp
@@ -1,6 +1,6 @@
 #include "z80dis.h"
 #include "z80.h"
-#include "z80mem.h"
+#include "zx_mem.h"
 #include <string.h>
 #include <stdio.h>
 #include <vector>
@@ -69,31 +69,31 @@ namespace z80dis
 
     const char *getBase(const uint16_t pos)
     {
-        if (z80mem::get()->readMem(pos) == 0xCB) {
+        if (mem::readMem(pos) == 0xCB) {
             opcode_size=2;
-            return cb_opcodes[z80mem::get()->readMem(pos+1)];
-        } else if (z80mem::get()->readMem(pos) == 0xDD) {
-            if (z80mem::get()->readMem(pos+1) == 0xCB) {
+            return cb_opcodes[mem::readMem(pos+1)];
+        } else if (mem::readMem(pos) == 0xDD) {
+            if (mem::readMem(pos+1) == 0xCB) {
                 opcode_size=4;
-                return ix_bit_opcodes[z80mem::get()->readMem(pos+3)];
+                return ix_bit_opcodes[mem::readMem(pos+3)];
             } else {
                 opcode_size=2;
-                return ix_opcodes[z80mem::get()->readMem(pos+1)];
+                return ix_opcodes[mem::readMem(pos+1)];
             }
-        } else if (z80mem::get()->readMem(pos) == 0xED) {
+        } else if (mem::readMem(pos) == 0xED) {
             opcode_size=2;
-            return misc_opcodes[(z80mem::get()->readMem(pos+1))-64];
-        } else if (z80mem::get()->readMem(pos) == 0xFD) {
-            if (z80mem::get()->readMem(pos+1) == 0xCB) {
+            return misc_opcodes[(mem::readMem(pos+1))-64];
+        } else if (mem::readMem(pos) == 0xFD) {
+            if (mem::readMem(pos+1) == 0xCB) {
                 opcode_size=4;
-                return iy_bit_opcodes[z80mem::get()->readMem(pos+3)];
+                return iy_bit_opcodes[mem::readMem(pos+3)];
             } else {
                 opcode_size=2;
-                return iy_opcodes[z80mem::get()->readMem(pos+1)];
+                return iy_opcodes[mem::readMem(pos+1)];
             }
         } else {
             opcode_size=1;
-            return base_opcodes[z80mem::get()->readMem(pos)];
+            return base_opcodes[mem::readMem(pos)];
         }
     }
 
@@ -103,7 +103,7 @@ namespace z80dis
         for (int i=0; i<4;++i)
         {
             if (opcode_size>i)
-                sprintf(hex, "%02x ", z80mem::get()->readMem(pos+i));
+                sprintf(hex, "%02x ", mem::readMem(pos+i));
             else
                 sprintf(hex, "   ");
             strcat(buffer, hex);
@@ -119,9 +119,9 @@ namespace z80dis
         if (strstr(buffer, "4x"))
         {
             opcode_size+=2;
-            const uint8_t memvalue = z80mem::get()->readMem(pos);
+            const uint8_t memvalue = mem::readMem(pos);
             const uint16_t address = pos + ((memvalue==0xFD) || (memvalue==0xDD) || (memvalue==0xED)?2:1);
-            const uint16_t word = z80mem::get()->readMem(address) + (z80mem::get()->readMem(address+1)<<8);
+            const uint16_t word = mem::readMem(address) + (mem::readMem(address+1)<<8);
             if (symbols[word][0]!=0) {
                 char *p = strstr(buffer, "$");
                 (*p)='%'; p++;
@@ -142,7 +142,7 @@ namespace z80dis
         {
             opcode_size = 4;
             strcpy(base, buffer);
-            sprintf(buffer, base, z80mem::get()->readMem(pos+2), (int8_t)z80mem::get()->readMem(pos+3));
+            sprintf(buffer, base, mem::readMem(pos+2), (int8_t)mem::readMem(pos+3));
             return buffer;
         }
 
@@ -150,7 +150,7 @@ namespace z80dis
         {
             opcode_size+=1;
             strcpy(base, buffer);
-            sprintf(buffer, base, z80mem::get()->readMem(pos+1));
+            sprintf(buffer, base, mem::readMem(pos+1));
         }
         
         if (strstr(buffer, "Xx"))
@@ -161,9 +161,9 @@ namespace z80dis
 
             if (opcode_size>4) {
                 opcode_size=4;
-                sprintf(buffer, base, pos + opcode_size + (int8_t)z80mem::get()->readMem(pos+2));
+                sprintf(buffer, base, pos + opcode_size + (int8_t)mem::readMem(pos+2));
             } else {
-                sprintf(buffer, base, pos + opcode_size + (int8_t)z80mem::get()->readMem(pos+1));
+                sprintf(buffer, base, pos + opcode_size + (int8_t)mem::readMem(pos+1));
             }
         }
         
@@ -173,9 +173,9 @@ namespace z80dis
             strcpy(base, buffer);
             if (opcode_size>4) {
                 opcode_size=4;
-                sprintf(buffer, base, (int8_t)z80mem::get()->readMem(pos+3));
+                sprintf(buffer, base, (int8_t)mem::readMem(pos+3));
             } else {
-                sprintf(buffer, base, (int8_t)z80mem::get()->readMem(pos+2));
+                sprintf(buffer, base, (int8_t)mem::readMem(pos+2));
             }
         }
 
diff --git a/z80mem.cpp b/z80mem.cpp
index 6989d5f..53bb09a 100644
--- a/z80mem.cpp
+++ b/z80mem.cpp
@@ -1,3 +1,5 @@
+/*
 #include "z80mem.h"
 
 z80mem* z80mem::singleton= nullptr;
+*/
\ No newline at end of file
diff --git a/z80mem.h b/z80mem.h
index aeacdea..82cada2 100644
--- a/z80mem.h
+++ b/z80mem.h
@@ -1,3 +1,4 @@
+/*
 #pragma once
 
 #include <stdint.h>
@@ -42,3 +43,4 @@ class z80mem
 
         static z80mem *singleton;
 };
+*/
\ No newline at end of file
diff --git a/zx_128bankviewer.cpp b/zx_128bankviewer.cpp
index b057f2f..d562e84 100644
--- a/zx_128bankviewer.cpp
+++ b/zx_128bankviewer.cpp
@@ -1,7 +1,7 @@
 #include "zx_128bankviewer.h"
 #include "z80.h"
-#include "z80mem.h"
-#include "zx_128mem.h"
+#include "zx_mem.h"
+//#include "zx_128mem.h"
 #include "ui.h"
 //#include "ui_window.h"
 
@@ -34,7 +34,7 @@ void zx_128bankviewer::refresh()
             //uint8_t tag = z80::getMemTag(i);
             //pixels[i] = tag==MEMTAG_NONE ? 0x808080 : tag==MEMTAG_DATA ? 0x0000FF : tag==MEMTAG_MIXED ? 0xFF00FF : 0x00FF00;
             uint32_t none_color = i<0x4000 ? 0x101010 : i<0x5800 ? 0x202020 : i<0x5b00 ? 0x404040 : 0x808080;
-            uint8_t tag = z80mem::get()->getTag(i);
+            uint8_t tag = mem::getTag(i);
             pixels[i] = !(tag & MEMTAG_TOUCHED) ? none_color : (tag & MEMTAG_TINST) ? 0x00FF00 : (tag & MEMTAG_TREPEAT) ? 0xFF0000 : 0x0000FF;
         }
         pixels[z80::getPC()] = 0xFFFFFF;
@@ -42,6 +42,7 @@ void zx_128bankviewer::refresh()
         SDL_UnlockTexture(tex);
         SDL_RenderCopy(ren, tex, NULL, NULL);
 
+/*
         char temp[256];
         zx_128mem* mem = ((zx_128mem*)z80mem::get());
         sprintf(temp, "%u", mem->getPage(0));
@@ -52,6 +53,7 @@ void zx_128bankviewer::refresh()
         ui::placetxt(1,257,temp, COLOR_WHITE);
         sprintf(temp, "%u", mem->getPage(3));
         ui::placetxt(1,385,temp, COLOR_WHITE);
+*/
 
         SDL_RenderPresent(ren);
 }
diff --git a/zx_128mem.cpp b/zx_128mem.cpp
index 554f6d7..037c14e 100644
--- a/zx_128mem.cpp
+++ b/zx_128mem.cpp
@@ -1,3 +1,4 @@
+/*
 #include "zx_128mem.h"
 #include "z80mem.h"
 #include "z80.h"
@@ -187,3 +188,4 @@ bool zx_128mem::getShadowScreen()
 {
     return config & ZX_128MEM_SCREEN;
 }
+*/
\ No newline at end of file
diff --git a/zx_128mem.h b/zx_128mem.h
index f451ce4..af7c804 100644
--- a/zx_128mem.h
+++ b/zx_128mem.h
@@ -1,3 +1,4 @@
+/*
 #pragma once
 #include "z80mem.h"
 
@@ -40,3 +41,4 @@ class zx_128mem : public z80mem
         uint8_t romtags[32768];
 
 };
+*/
\ No newline at end of file
diff --git a/zx_128pageviewer.cpp b/zx_128pageviewer.cpp
index 910079e..faa0b5d 100644
--- a/zx_128pageviewer.cpp
+++ b/zx_128pageviewer.cpp
@@ -1,6 +1,6 @@
 #include "zx_128pageviewer.h"
 #include "z80.h"
-#include "z80mem.h"
+#include "zx_mem.h"
 
 void zx_128pageviewer::show()
 {
@@ -22,7 +22,7 @@ void zx_128pageviewer::refresh()
 
         Uint32 *pixels;
         int pitch;
-        const uint8_t *tags = z80mem::get()->rawTagPtr(0);
+        const uint8_t *tags = mem::rawTagPtr(0);
         SDL_LockTexture(tex, NULL, (void**)&pixels, &pitch);
         for (int i=0; i<131072; ++i)
         {
diff --git a/zx_48mem.cpp b/zx_48mem.cpp
index 1a9c6b3..81a0d32 100644
--- a/zx_48mem.cpp
+++ b/zx_48mem.cpp
@@ -1,3 +1,4 @@
+/*
 #include "zx_48mem.h"
 #include "z80mem.h"
 #include <string.h>
@@ -67,4 +68,5 @@ uint8_t *zx_48mem::rawPtr(uint32_t address)
 uint8_t *zx_48mem::rawTagPtr(uint32_t address)
 {
     return &tags[address];
-}
\ No newline at end of file
+}
+*/
\ No newline at end of file
diff --git a/zx_48mem.h b/zx_48mem.h
index 4f2f6d1..d10e94b 100644
--- a/zx_48mem.h
+++ b/zx_48mem.h
@@ -1,3 +1,4 @@
+/*
 #pragma once
 #include "z80mem.h"
 
@@ -30,3 +31,4 @@ class zx_48mem : public z80mem
         uint8_t tags[65536];
 
 };
+*/
\ No newline at end of file
diff --git a/zx_mem.cpp b/zx_mem.cpp
new file mode 100644
index 0000000..59b0621
--- /dev/null
+++ b/zx_mem.cpp
@@ -0,0 +1,161 @@
+#include "zx_mem.h"
+#include "stdlib.h"
+#include "z80.h"
+#include "zx_screen.h"
+
+#define ZX_128MEM_PAGE      0x07
+#define ZX_128MEM_SCREEN    0x08
+#define ZX_128MEM_ROM       0x10
+#define ZX_128MEM_DISPAG    0x20
+
+namespace mem
+{
+    uint8_t mode = ZX_48K;
+    uint32_t ram_size = 48*1024;
+    uint32_t rom_size = 16*1024;
+    uint8_t *ram = nullptr;
+    uint8_t *rom = nullptr;
+    uint8_t *slot[8];
+    bool writable[8];
+
+    uint8_t config_128K;
+
+    void zx_128_port_out(int port, int val);
+
+    void init(uint8_t mode)
+    {
+        mem::mode = mode;
+        if (ram) free(ram);
+        if (rom) free(rom);
+
+        reset();
+    }
+
+    void reset()
+    {
+        FILE* f;
+        switch(mode)
+        {
+            case ZX_48K:
+                ram_size = 48*1024;
+                ram = (uint8_t*)malloc(ram_size);
+                for (int i=0; i<ram_size; ++i) ram[i] = 0;
+                //for (int i=0; i<65536; ++i) tags[i] = MEMTAG_NONE;
+
+                rom_size = 16*1024;
+                rom = (uint8_t*)malloc(rom_size);
+                f = fopen("48.rom", "rb");
+                fread(rom, rom_size, 1, f);
+                fclose(f);
+
+                slot[0] = &rom[0*8192]; slot[1] = &rom[1*8192];
+                slot[2] = &ram[0*8192]; slot[3] = &ram[1*8192];
+                slot[4] = &ram[2*8192]; slot[5] = &ram[3*8192];
+                slot[6] = &ram[4*8192]; slot[7] = &ram[5*8192];
+
+                writable[0] = writable[1] = false;
+                for (int i=2;i<8;++i) writable[i] = true;
+                break;
+            case ZX_128K:
+                ram_size = 128*1024;
+                ram = (uint8_t*)malloc(ram_size);
+                for (int i=0x0000; i<ram_size; ++i) ram[i] = 0;
+
+                rom_size = 32*1024;
+                rom = (uint8_t*)malloc(rom_size);
+                f = fopen("128k.rom", "rb");
+                fread(rom, rom_size, 1, f);
+                fclose(f);
+
+                slot[0] = &rom[0*8192]; slot[1] = &rom[1*8192];
+                slot[2] = &ram[10*8192]; slot[3] = &ram[11*8192];
+                slot[4] = &ram[4*8192]; slot[5] = &ram[5*8192];
+                slot[6] = &ram[0*8192]; slot[7] = &ram[1*8192];
+
+                writable[0] = writable[1] = false;
+                for (int i=2;i<8;++i) writable[i] = true;
+
+                z80::connect_port(0xfd, nullptr, mem::zx_128_port_out);
+                break;
+        }
+    }
+
+    uint8_t readMem(uint16_t address)
+    {
+        const uint8_t slot_num = address >> 13;
+        const uint16_t displacement = address & 0x1fff;
+        return slot[slot_num][displacement];
+    }
+
+    void writeMem(uint16_t address, uint8_t value)
+    {
+        const uint8_t slot_num = address >> 13;
+        if (!writable[slot_num]) return;
+
+        const uint16_t displacement = address & 0x1fff;
+        slot[slot_num][displacement] = value;
+    }
+
+    void loadMem(uint16_t address, uint16_t len, uint8_t *buffer)
+    {
+
+    }
+
+    uint8_t getTag(uint16_t address)
+    {
+        return 0;
+    }
+
+    void setTag(uint16_t address, uint8_t value)
+    {
+
+    }
+
+    void saveState(FILE* f)
+    {
+        fwrite(ram, 0xc000, 1, f);
+    }
+
+    void loadState(FILE* f)
+    {
+        fread(ram, 0xc000, 1, f);
+    }
+
+    uint32_t getSize()
+    {
+        return 0;
+    }
+
+    uint8_t *rawPtr(uint32_t address)
+    {
+        return &ram[address];
+    }
+
+    uint8_t *rawTagPtr(uint32_t address)
+    {
+        return nullptr;
+    }
+
+    void zx_128_port_out(int port, int val)
+    {
+        if (port != 0x7ffd) return;
+        if (config_128K & ZX_128MEM_DISPAG) return;
+
+        const bool shadow = config_128K & ZX_128MEM_SCREEN;
+        config_128K = val;
+        if (config_128K & ZX_128MEM_SCREEN) {
+            if (!shadow) zxscreen::setBaseAddresses(0x4000*7, 0x1800+0x4000*7);
+        } else {
+            if (shadow) zxscreen::setBaseAddresses(0x4000*5, 0x1800+0x4000*5);
+        }
+
+        if (config_128K & ZX_128MEM_ROM) {
+            slot[0] = &rom[2*8192]; slot[1] = &rom[3*8192];
+        } else {            
+            slot[0] = &rom[0*8192]; slot[1] = &rom[1*8192];
+        }
+
+        const uint8_t slot3 = (config_128K&ZX_128MEM_PAGE)*2;
+        slot[6] = &ram[slot3*8192]; slot[7] = &ram[(slot3+1)*8192];
+    }
+}
diff --git a/zx_mem.h b/zx_mem.h
new file mode 100644
index 0000000..cb74861
--- /dev/null
+++ b/zx_mem.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdio.h>
+
+#define MEMTAG_NONE     0x00
+#define MEMTAG_DATA     0x01
+#define MEMTAG_INST     0x02
+#define MEMTAG_CODE     0x04
+#define MEMTAG_IGNORE   0x08
+#define MEMTAG_TDATA    0x10
+#define MEMTAG_TINST    0x20
+#define MEMTAG_TREPEAT  0x40
+#define MEMTAG_MODIFIED 0x80
+
+#define MEMTAG_KNOWN    0x07
+#define MEMTAG_TOUCHED  0x70
+
+#define ZX_48K          0x00
+#define ZX_128K         0x01
+#define ZX_2A_3         0x02
+#define ZX_NEXT         0x03
+
+namespace mem
+{
+    void init(uint8_t mode);
+    void reset();
+
+    uint8_t readMem(uint16_t address);
+    void writeMem(uint16_t address, uint8_t value);
+
+    void loadMem(uint16_t address, uint16_t len, uint8_t *buffer);
+
+    uint8_t getTag(uint16_t address);
+    void setTag(uint16_t address, uint8_t value);
+
+    void saveState(FILE* f);
+    void loadState(FILE* f);
+
+    uint32_t getSize();
+
+    uint8_t *rawPtr(uint32_t address);
+    uint8_t *rawTagPtr(uint32_t address);
+}
diff --git a/zx_screen.cpp b/zx_screen.cpp
index b2bc161..c524345 100644
--- a/zx_screen.cpp
+++ b/zx_screen.cpp
@@ -1,13 +1,13 @@
 #include "zx_screen.h"
 #include "z80.h"
-#include "z80mem.h"
+#include "zx_mem.h"
 #include "zx_ula.h"
 #include <SDL2/SDL.h>
 #include "zx_tape.h"
 #include "ui_window.h"
 #include "z80debug.h"
 #include "ui.h"
-#include "zx_128mem.h"
+//#include "zx_128mem.h"
 
 namespace zxscreen
 {
@@ -200,7 +200,7 @@ namespace zxscreen
     {
         zxscreen::mode = mode;
         if (mode==SCREEN_MODE_48K) {
-            setBaseAddresses(0x4000, 0x5800);
+            setBaseAddresses(0x0000, 0x1800);
             t_states_total = 69888;
             t_states_per_scanline = 224;
             vsync_lines = 16;
@@ -226,8 +226,8 @@ namespace zxscreen
 
     void refresh(const uint32_t dt, const bool full)
     {
-        const uint8_t* pixel_mem = z80mem::get()->rawPtr(pixel_base_addr);
-        const uint8_t* color_mem = z80mem::get()->rawPtr(color_base_addr);
+        const uint8_t* pixel_mem = mem::rawPtr(pixel_base_addr);
+        const uint8_t* color_mem = mem::rawPtr(color_base_addr);
         const uint8_t border_color = zx_ula::get_border_color();
 
         for (int i=0;i<dt;++i)
@@ -301,8 +301,8 @@ namespace zxscreen
         // Pintem la textura a pantalla
         SDL_RenderCopy(ren, tex, NULL, &dest_rect);
 
-        zx_128mem* mem = ((zx_128mem*)z80mem::get());
-        ui::printtxt(0,0,mem->getShadowScreen()?"SHADOW":"NORMAL", COLOR_WHITE);
+        //zx_128mem* mem = ((zx_128mem*)z80mem::get());
+        //ui::printtxt(0,0,mem->getShadowScreen()?"SHADOW":"NORMAL", COLOR_WHITE);
 
         if (present)
             SDL_RenderPresent(ren);