- [FIX] Corregit el acces als port amb OUT

- [NEW] Nou model de gestió de memòria
2025-07-23 13:51:51 +02:00
parent 3fd28136f6
commit 6e3e8e9b69
16 changed files with 315 additions and 94 deletions
--- a/zx_mem.cpp
+++ 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];
+    }
+}