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Fix run on linux

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This commit is contained in:
Kilian
2026-08-31 04:43:52 +02:00
parent f5672ee9c3
commit d37d434228
13 changed files with 151 additions and 98 deletions
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.vscode/launch.json
Vendored
+39 -3
View File
@@ -1,11 +1,47 @@
{
"configurations": [
{
"name": "(lldb) Anfügen",
"name": "(gdb) Launch",
"type": "cppdbg",
"request": "attach",
"request": "launch",
"program": "${workspaceFolder}/build/6502PC",
"MIMode": "lldb"
"args": [],
"stopAtEntry": false,
"cwd": "${workspaceFolder}/build",
"environment": [],
"externalConsole": false,
"MIMode": "gdb",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
},
{
"description": "Set Disassembly Flavor to Intel",
"text": "-gdb-set disassembly-flavor intel",
"ignoreFailures": true
}
]
},
{
"name": "(lldb) Launch",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/build/6502PC",
"args": [],
"stopAtEntry": false,
"cwd": "${workspaceFolder}/build",
"environment": [],
"externalConsole": false,
"MIMode": "lldb",
"setupCommands": [
{
"description": "Set Disassembly Flavor to Intel",
"text": "settings set target.x86-disassembly-flavor intel",
"ignoreFailures": true
}
]
}
]
}
6502_65C02_functional_tests/6502_decimal_test.a65
+15 -4
View File
@@ -66,6 +66,8 @@ N2H ds 2
code
org $200
lda #1
sta $dc02
TEST ldy #1 ; initialize Y (used to loop through carry flag values)
sty ERROR ; store 1 in ERROR until the test passes
lda #0 ; initialize N1 and N2
@@ -111,24 +113,33 @@ LOOP2 lda N1 ; N1L = N1 & $0F
bne DONE
NEXT1 inc N1 ; [5] see text
bne LOOP2 ; loop through all 256 values of N1
NEXT2 inc N2 ; [6] see text
NEXT2 lda #'*'
sta $dc00
inc N2 ; [6] see text
bne LOOP1 ; loop through all 256 values of N2
dey
bpl LOOP1 ; loop through both values of the carry flag
lda #0 ; test passed, so store 0 in ERROR
sta ERROR
DONE
lda #0
jsr RCHAR
lda #1
cmp ERROR
beq _E
lda #'P'
sta $dc00
jmp _E2
_E lda #'F'
sta $dc00
_E2
_E2 jsr RCHAR
end_of_test
RCHAR sta $dc00
lda #'\r'
sta $dc00
lda #'\n'
sta $dc00
rts
; Calculate the actual decimal mode accumulator and flags, the accumulator
; and flag results when N1 is added to N2 using binary arithmetic, the
; predicted accumulator result, the predicted carry flag, and the predicted
6502_65C02_functional_tests/6502_functional_test.a65
+3 -1
View File
@@ -735,7 +735,9 @@ data_bss_end
code
org code_segment
start cld
start lda #1
sta $dc02
cld
ldx #$ff
txs
lda #0 ;*** test 0 = initialize
CMakelists.txt
+4
View File
@@ -10,7 +10,11 @@ enable_language(C)
add_executable(${CMAKE_PROJECT_NAME})
if(MSVC)
target_compile_options(${CMAKE_PROJECT_NAME} PRIVATE /W4)
else()
target_compile_options(${CMAKE_PROJECT_NAME} PRIVATE -Wall -Wextra -Wpedantic)
endif()
target_sources(${CMAKE_PROJECT_NAME} PRIVATE
"src/main.c"
inc/io.h
+2 -4
View File
@@ -1,16 +1,14 @@
#ifndef IO_H
#define IO_H
#include "ram.h"
#include <stdint.h>
#define IO_SIZE (1 * 1024) // 1KiB
#define IO_BASE (RAM_SIZE) // 55KiB RAM
#define IO_BASE (55 * 1024) // 55KiB RAM, hard coded
#define SCREEN_ADDRESS 0
#define KEYBOARD_ADDRESS 1
#define ROM_BANKED_OUT 2
int putChar(uint8_t c);
int getChar(void);
inc/memoryMap.h
+1 -1
View File
@@ -8,7 +8,7 @@
#include <stdint.h>
uint8_t readMemory(uint16_t address, uint8_t *ram, uint8_t *rom);
void writeMemory(uint16_t address, uint8_t value, uint8_t *ram, uint8_t *rom);
void writeMemory(uint16_t address, uint8_t value, uint8_t *ram);
uint8_t readStack(uint8_t address, uint8_t *ram);
void writeStack(uint8_t address, uint8_t value, uint8_t *ram);
inc/ram.h
+1 -3
View File
@@ -3,9 +3,7 @@
#include "stdint.h"
#define RAM_SIZE (55 * 1024) // 55KiB
//#define RAM_SIZE (64 * 1024) // Full range, DEBUG mode
#define RAM_SIZE (64 * 1024) // 55KiB
#define RAM_BASE (0x00) // 0
int createRAM(uint8_t **ram);
inc/rom.h
+2 -4
View File
@@ -1,14 +1,12 @@
#ifndef ROM_H
#define ROM_H
#include "io.h"
#include <stdint.h>
#define ROM_SIZE (8 * 1024) // 8KiB
#define ROM_BASE (IO_BASE + IO_SIZE) // 55KiB RAM + 1KiB IO
#define ROM_BASE (56 * 1024) // 55KiB RAM + 1KiB IO, hard coded
uint8_t rom[ROM_SIZE];
extern uint8_t rom[ROM_SIZE];
void initRom(uint8_t *rom);
src/cpu.c
+38 -40
View File
@@ -1,4 +1,5 @@
#include "cpu.h"
#include "memoryMap.h"
#include "opcodes.h"
@@ -74,7 +75,6 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t opcode = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Decode opcode, fetch operands, execute
switch (opcode) {
case BRK: {
// Store return address on stack
@@ -132,7 +132,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
writeMemory(offset, value, ram, rom);
writeMemory(offset, value, ram);
return 5;
}
@@ -187,7 +187,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
writeMemory(COMBINE(high, low), value, ram, rom);
writeMemory(COMBINE(high, low), value, ram);
return 6;
}
@@ -250,7 +250,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
writeMemory((uint8_t)(cpu->X + offset), value, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), value, ram);
return 6;
}
@@ -297,7 +297,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
writeMemory(cpu->X + COMBINE(high, low), value, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), value, ram);
return 7;
}
@@ -369,7 +369,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory(offset, value, ram, rom);
writeMemory(offset, value, ram);
return 5;
}
@@ -442,7 +442,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory(COMBINE(high, low), value, ram, rom);
writeMemory(COMBINE(high, low), value, ram);
return 6;
}
@@ -508,7 +508,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory((uint8_t)(cpu->X + offset), value, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), value, ram);
return 6;
}
@@ -558,7 +558,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory(cpu->X + COMBINE(high, low), value, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), value, ram);
return 7;
}
@@ -614,7 +614,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = 0;
writeMemory(offset, value, ram, rom);
writeMemory(offset, value, ram);
return 5;
}
@@ -677,7 +677,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = 0;
writeMemory(COMBINE(high, low), value, ram, rom);
writeMemory(COMBINE(high, low), value, ram);
return 6;
}
@@ -740,7 +740,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = 0;
writeMemory((uint8_t)(cpu->X + offset), value, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), value, ram);
return 6;
}
@@ -787,7 +787,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Set flags and write to memory
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = 0;
writeMemory(cpu->X + COMBINE(high, low), value, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), value, ram);
return 7;
}
@@ -840,7 +840,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory(offset, value, ram, rom);
writeMemory(offset, value, ram);
return 5;
}
@@ -911,7 +911,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory(COMBINE(high, low), value, ram, rom);
writeMemory(COMBINE(high, low), value, ram);
return 6;
}
@@ -973,7 +973,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory((uint8_t)(cpu->X + offset), value, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), value, ram);
return 6;
}
@@ -1019,7 +1019,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Write value
writeMemory(cpu->X + COMBINE(high, low), value, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), value, ram);
return 7;
}
@@ -1033,7 +1033,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t low = readMemory(_address, ram, rom);
uint8_t high = readMemory((uint8_t)(_address + 1), ram, rom);
// Store accumulator at address
writeMemory(COMBINE(high, low), cpu->Accumulator, ram, rom);
writeMemory(COMBINE(high, low), cpu->Accumulator, ram);
return 6;
}
@@ -1041,7 +1041,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get offset
uint8_t offset = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store Y at address
writeMemory(offset, cpu->Y, ram, rom);
writeMemory(offset, cpu->Y, ram);
return 3;
}
@@ -1049,7 +1049,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get offset
uint8_t offset = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory(offset, cpu->Accumulator, ram, rom);
writeMemory(offset, cpu->Accumulator, ram);
return 3;
}
@@ -1057,7 +1057,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get offset
uint8_t offset = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store X at address
writeMemory(offset, cpu->X, ram, rom);
writeMemory(offset, cpu->X, ram);
return 3;
}
@@ -1082,7 +1082,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t low = readMemory(cpu->ProgrammeCounter++, ram, rom);
uint8_t high = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store Y at address
writeMemory(COMBINE(high, low), cpu->Y, ram, rom);
writeMemory(COMBINE(high, low), cpu->Y, ram);
return 4;
}
@@ -1091,7 +1091,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t low = readMemory(cpu->ProgrammeCounter++, ram, rom);
uint8_t high = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory(COMBINE(high, low), cpu->Accumulator, ram, rom);
writeMemory(COMBINE(high, low), cpu->Accumulator, ram);
return 4;
}
@@ -1100,7 +1100,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t low = readMemory(cpu->ProgrammeCounter++, ram, rom);
uint8_t high = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store X at address
writeMemory(COMBINE(high, low), cpu->X, ram, rom);
writeMemory(COMBINE(high, low), cpu->X, ram);
return 4;
}
@@ -1132,7 +1132,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get address
uint16_t address = cpu->Y + COMBINE(high, low);
// Store accumulator at address
writeMemory(address, cpu->Accumulator, ram, rom);
writeMemory(address, cpu->Accumulator, ram);
return 6;
}
@@ -1140,7 +1140,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get offset
uint8_t offset = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory((uint8_t)(cpu->X + offset), cpu->Y, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), cpu->Y, ram);
return 4;
}
@@ -1148,7 +1148,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get offset
uint8_t offset = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory((uint8_t)(cpu->X + offset), cpu->Accumulator, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), cpu->Accumulator, ram);
return 4;
}
@@ -1156,7 +1156,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
// Get offset
uint8_t offset = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory((uint8_t)(cpu->Y + offset), cpu->X, ram, rom);
writeMemory((uint8_t)(cpu->Y + offset), cpu->X, ram);
return 4;
}
@@ -1173,7 +1173,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t low = readMemory(cpu->ProgrammeCounter++, ram, rom);
uint8_t high = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory(cpu->Y + COMBINE(high, low), cpu->Accumulator, ram, rom);
writeMemory(cpu->Y + COMBINE(high, low), cpu->Accumulator, ram);
return 5;
}
@@ -1187,7 +1187,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
uint8_t low = readMemory(cpu->ProgrammeCounter++, ram, rom);
uint8_t high = readMemory(cpu->ProgrammeCounter++, ram, rom);
// Store accumulator at address
writeMemory(cpu->X + COMBINE(high, low), cpu->Accumulator, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), cpu->Accumulator, ram);
return 5;
}
@@ -1533,7 +1533,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory(offset, value, ram, rom);
writeMemory(offset, value, ram);
return 5;
}
@@ -1606,7 +1606,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory(COMBINE(high, low), value, ram, rom);
writeMemory(COMBINE(high, low), value, ram);
return 6;
}
@@ -1672,7 +1672,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory((uint8_t)(cpu->X + offset), value, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), value, ram);
return 6;
}
@@ -1722,7 +1722,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory(cpu->X + COMBINE(high, low), value, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), value, ram);
return 7;
}
@@ -1788,7 +1788,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory(offset, value, ram, rom);
writeMemory(offset, value, ram);
return 5;
}
@@ -1848,7 +1848,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory(COMBINE(high, low), value, ram, rom);
writeMemory(COMBINE(high, low), value, ram);
return 6;
}
@@ -1906,7 +1906,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory((uint8_t)(cpu->X + offset), value, ram, rom);
writeMemory((uint8_t)(cpu->X + offset), value, ram);
return 6;
}
@@ -1948,7 +1948,7 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
cpu->Flags.ZeroFlag = value == 0;
cpu->Flags.NegativeFlag = (value & 0x80) != 0;
// Store at address
writeMemory(cpu->X + COMBINE(high, low), value, ram, rom);
writeMemory(cpu->X + COMBINE(high, low), value, ram);
return 7;
}
@@ -1957,7 +1957,5 @@ uint8_t runCycle(CPU *cpu, uint8_t *ram, uint8_t *rom) {
break;
}
// Return sleep duration in microseconds to emulate cycle count of executed instruction
return 1;
}
src/main.c
+4 -5
View File
@@ -49,13 +49,15 @@ int main(void) {
/* DEBUG */
//FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
//FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
//FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
if (!fp) {
perror("fopen");
return 1;
}
fread(ram, 1, 64 * 1024, fp);
fread(ram, 1, RAM_SIZE, fp);
if (ferror(fp)) {
perror("fread");
fclose(fp);
@@ -70,7 +72,6 @@ int main(void) {
resetCPU(&cpu, rom);
while (1) {
// printf("\tPC: 0x%x\tOP: 0x%x\n", cpu.ProgrammeCounter, ram[cpu.ProgrammeCounter]);
uint8_t sleep = runCycle(&cpu, ram, rom);
if (sleep == 1) {
printf("opcode missing: 0x%X\n", ram[cpu.ProgrammeCounter - 1]);
@@ -81,8 +82,6 @@ int main(void) {
nanosleep(&sleepTime, NULL);
}
/* CPU WORK */
destroyRAM(ram);
return 0;
src/memoryMap.c
+20 -11
View File
@@ -1,41 +1,50 @@
#include "memoryMap.h"
uint8_t readMemory(uint16_t address, uint8_t *ram, uint8_t *rom) {
if (address < RAM_SIZE || address >= IO_BASE + IO_SIZE) { // FIXME: Expanded for debug
if ((address < RAM_SIZE && address < IO_BASE) || address >= ROM_BASE) {
if (address >= ROM_BASE && ram[IO_BASE + ROM_BANKED_OUT] == 0) {
return rom[address - ROM_BASE];
}
return ram[address];
} else if (address < RAM_SIZE + IO_SIZE) {
uint16_t _address = address - RAM_SIZE;
} else {
uint16_t _address = address - IO_BASE;
switch (_address) {
case KEYBOARD_ADDRESS: {
return getChar();
}
case ROM_BANKED_OUT: {
return ram[IO_BASE + ROM_BANKED_OUT];
}
default:
break;
}
return 0;
} else {
return rom[address - RAM_SIZE - IO_SIZE];
}
}
void writeMemory(uint16_t address, uint8_t value, uint8_t *ram, uint8_t *rom) {
if (address < RAM_SIZE) {
void writeMemory(uint16_t address, uint8_t value, uint8_t *ram) {
if ((address < RAM_SIZE && address < IO_BASE) || address >= ROM_BASE) {
if (address < ROM_BASE && ram[IO_BASE + ROM_BANKED_OUT] != 0) {
ram[address] = value;
} else if (address < RAM_SIZE + IO_SIZE || address >= IO_BASE + IO_SIZE) { // FIXME: Expanded for debug
uint16_t _address = address - RAM_SIZE;
}
} else {
uint16_t _address = address - IO_BASE;
switch (_address) {
case SCREEN_ADDRESS: {
putChar(value);
break;
}
case ROM_BANKED_OUT: {
ram[IO_BASE + ROM_BANKED_OUT] = value;
break;
}
default:
break;
}
} else {
rom[address - RAM_SIZE - IO_SIZE] = value;
}
}
src/ram.c
+8
View File
@@ -1,11 +1,19 @@
#include "ram.h"
#include "io.h"
#include <stdlib.h>
int createRAM(uint8_t **ram) {
*ram = (uint8_t *)malloc(RAM_SIZE);
if (*ram == NULL) return -1;
// Zero IO
for (size_t i = IO_BASE; i < IO_SIZE; i++) {
ram[i] = 0;
}
return 0;
}
src/rom.c
+4 -12
View File
@@ -1,19 +1,11 @@
#include "rom.h"
#include "io.h"
uint8_t rom[ROM_SIZE] = {0};
void initRom(uint8_t *rom) {
rom[0] = 0xa9, // LDA
rom[1] = 'H', // H literal
rom[2] = 0x8d, // STA
rom[3] = (uint8_t)((IO_BASE + SCREEN_ADDRESS) & 0xFF), // Lower byte of screen
rom[4] = (uint8_t)((IO_BASE + SCREEN_ADDRESS) >> 8), // Upper byte of screen
rom[6] =
/* Reset Vector */
rom[0xFFFC - ROM_BASE] = 0x00, // Lower byte base of ROM
rom[0xFFFD - ROM_BASE] = 0x02, // Upper byte of base of ROM
rom[0xFFFE - ROM_BASE] = 0x00, // Lower byte base of ROM
rom[0xFFFF - ROM_BASE] = 0x00; // Upper byte of base of ROM
rom[0xFFFC - ROM_BASE] = 0x00; // Lower byte base of ROM
rom[0xFFFD - ROM_BASE] = 0x04; // Upper byte of base of ROM
}