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tools/emul/shell: fix srong SeekL return value

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Also, add warning on attempts to write to ROM.
This commit is contained in:
Virgil Dupras 2019-05-12 14:32:24 -04:00
parent 51bab80a4c
commit 9b4b907236
1 changed files with 5 additions and 1 deletions
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6
tools/emul/shell.c
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@ -26,6 +26,7 @@
*/ */
// in sync with shell.asm // in sync with shell.asm
#define RAMSTART 0x4000
#define STDIO_PORT 0x00 #define STDIO_PORT 0x00
#define FS_DATA_PORT 0x01 #define FS_DATA_PORT 0x01
#define FS_SEEKL_PORT 0x02 #define FS_SEEKL_PORT 0x02
@ -54,7 +55,7 @@ static uint8_t io_read(int unused, uint16_t addr)
return 0; return 0;
} }
} else if (addr == FS_SEEKL_PORT) { } else if (addr == FS_SEEKL_PORT) {
return fsdev_ptr && 0xff; return fsdev_ptr & 0xff;
} else if (addr == FS_SEEKH_PORT) { } else if (addr == FS_SEEKH_PORT) {
return fsdev_ptr >> 8; return fsdev_ptr >> 8;
} else { } else {
@ -92,6 +93,9 @@ static uint8_t mem_read(int unused, uint16_t addr)
static void mem_write(int unused, uint16_t addr, uint8_t val) static void mem_write(int unused, uint16_t addr, uint8_t val)
{ {
if (addr < RAMSTART) {
fprintf(stderr, "Writing to ROM (%d)!\n", addr);
}
mem[addr] = val; mem[addr] = val;
} }