Raimon @ quifisraimon
22fd027cff
- [NEW] Afegida la rom de Combat. - [NEW] Afegit mòdul "rom" - [NEW] Ampliats stubs de "mem", "tia" i "pia"
75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#include "pia.h"
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namespace pia
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{
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uint8_t ram[128];
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uint8_t INTIM;
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uint8_t TIMINT;
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void reset()
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{
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}
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void tick()
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{
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}
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uint8_t read(uint16_t address)
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{
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if (address & 0x200) {
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if ( (address & 0x04) ) {
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// Timer functions
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if (address & 0x01) {
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uint8_t flags = TIMINT;
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TIMINT &= ~0x80; // resetejem el flag
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return flags;
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} else {
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return INTIM;
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}
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} else {
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// I/O Ports
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switch( address & 0x03) {
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case 0x00: // [TODO] SWCHA
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case 0x01: // [TODO] DDRA
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case 0x02: // [TODO] SWCHB
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case 0x03: // [TODO] DDRB
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}
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}
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} else {
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return ram[address & 0x7f];
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}
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}
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void write(uint16_t address, uint8_t value)
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{
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if (address & 0x200) {
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if ( (address & 0x04) ) {
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if ( (address & 0x10) ) {
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// Timer functions
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switch( address & 0x03) {
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case 0x00: // [TODO] TIM1T
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case 0x01: // [TODO] TIM8T
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case 0x02: // [TODO] TIM64T
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case 0x03: // [TODO] TIM1024T
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}
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} else {
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// Funcionalitat relacionada amb les interrupcions. Ignorar per a la Atari 2600
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}
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} else {
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// I/O Ports
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switch( address & 0x03) {
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case 0x00: // [TODO] SWCHA
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case 0x01: // [TODO] DDRA
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case 0x02: // [TODO] SWCHB
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case 0x03: // [TODO] DDRB
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}
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}
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} else {
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ram[address & 0x7f] = value;
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}
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}
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}
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