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Add init functions for disk2, sys rom

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Also move the defines for bank offset, rom size, etc. into apple2.mem.h
which makes a little more sense.
This commit is contained in:
Peter Evans 2018-01-03 15:07:19 -06:00
parent 5b2c376abc
commit e7a404508e
3 changed files with 71 additions and 15 deletions
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15
include/apple2.h
View File

@ -6,21 +6,6 @@
#include "vm_bitfont.h"
#include "vm_screen.h"
/*
* The size of our block of ROM is 12k
*/
#define APPLE2_ROM_SIZE 0x3000
/*
* Whereas the second bank of RAM is a mere 4k
*/
#define APPLE2_RAM2_SIZE 0x1000
/*
* This is the base address (or offset) for all bank-switched memory
*/
#define APPLE2_BANK_OFFSET 0xD000
enum video_modes {
VIDEO_40COL_TEXT,
VIDEO_LORES,

21
include/apple2.mem.h
View File

@ -4,8 +4,29 @@
#include "apple2.h"
#include "vm_segment.h"
#define APPLE2_DISK2_ROM_OFFSET 0xC600
#define APPLE2_DISK2_ROM_SIZE 0x100
/*
* The size of our block of ROM is 12k
*/
#define APPLE2_ROM_SIZE 0x3000
/*
* Whereas the second bank of RAM is a mere 4k
*/
#define APPLE2_RAM2_SIZE 0x1000
/*
* This is the base address (or offset) for all bank-switched memory
*/
#define APPLE2_BANK_OFFSET 0xD000
extern vm_8bit apple2_mem_read_bank(vm_segment *, size_t, void *);
extern void apple2_mem_write_bank(vm_segment *, size_t, vm_8bit, void *);
extern void apple2_mem_map(apple2 *);
extern int apple2_mem_init_disk2_rom(apple2 *);
extern int apple2_mem_init_sys_rom(apple2 *);
#endif

50
src/apple2.mem.c
View File

@ -3,6 +3,7 @@
*/
#include "apple2.h"
#include "apple2.mem.h"
/*
* Return a byte of memory from a bank-switchable address. This may be
@ -93,3 +94,52 @@ apple2_mem_map(apple2 *mach)
vm_segment_write_map(mach->memory, addr, apple2_mem_write_bank);
}
}
/*
* Since we can't write into ROM normally, we need a separate function
* we can call which will do the writing for us.
*/
int
apple2_mem_init_disk2_rom(apple2 *mach)
{
FILE *stream;
int err;
stream = fopen("./disk2.rom", "r");
if (stream == NULL) {
log_critical("Could not read disk2.rom");
return ERR_BADFILE;
}
err = vm_segment_fread(mach->memory, stream,
APPLE2_DISK2_ROM_OFFSET, APPLE2_DISK2_ROM_SIZE);
if (err != OK) {
fclose(stream);
log_critical("Could not read disk2.rom");
return ERR_BADFILE;
}
return OK;
}
int
apple2_mem_init_sys_rom(apple2 *mach)
{
FILE *stream;
int err;
stream = fopen("./apple2.rom", "r");
if (stream == NULL) {
log_critical("Could not read apple2.rom");
return ERR_BADFILE;
}
err = vm_segment_fread(mach->rom, stream, 0, APPLE2_ROM_SIZE);
if (err != OK) {
fclose(stream);
log_critical("Could not read apple2.rom");
return ERR_BADFILE;
}
return OK;
}