apple1-videocard-lib/lib/apple1.h
2021-12-16 18:34:16 +01:00

122 lines
2.6 KiB
C

#ifdef APPLE1
// APPLE1
const word WOZMON = 0xFF1F; // enters monitor
const word ECHO = 0xFFEF; // output ascii character in A (A not destroyed)
const word PRBYTE = 0xFFDC; // print hex byte in A (A destroyed)
const word KEY_DATA = 0xd010; // read key
const word KEY_CTRL = 0xd011; // control port
const word TERM_DATA = 0xd012; // write ascii
const word TERM_CTRL = 0xd013; // control port
#else
// VIC20
const word ECHO = 0xFFD2; // chrout routine in kernal rom
const word GETIN = 0xFFE4; // GETIN keyboard read routine
#endif
// prints a hex byte using the WOZMON routine
void woz_print_hex(byte c) {
#ifdef APPLE1
asm {
lda c
jsr PRBYTE
};
#else
asm {
lda c
jsr ECHO
};
#endif
}
// puts a character on the apple1 screen using the WOZMON routine
void woz_putc(byte c) {
asm {
lda c
jsr ECHO
}
}
// puts a 0-terminated string on the apple1 screen
void woz_puts(byte *s) {
byte c;
while(c=*s++) woz_putc(c);
}
// returns to WOZMON prompt
void woz_mon() {
#ifdef APPLE1
asm {
jmp WOZMON
}
#endif
}
// returns nonzero if a key has been pressed
inline byte apple1_iskeypressed() {
#ifdef APPLE1
return PEEK(KEY_CTRL) & 0x80;
#else
return 0;
#endif
}
// blocking keyboard read
// reads a key from the apple-1 keyboard
byte apple1_getkey() {
#ifdef APPLE1
asm {
__wait:
lda KEY_CTRL
bpl __wait
}
return PEEK(KEY_DATA) & 0x7f;
#else
byte key;
byte const *keyptr = &key;
kickasm(uses keyptr, uses GETIN) {{
__wait:
jsr GETIN
cmp #0
beq __wait
sta keyptr
}}
return key;
#endif
}
// non blocking keyboard read
// reads a key and return 0 if no key is pressed
byte apple1_readkey() {
#ifdef APPLE1
if((PEEK(KEY_CTRL) & 0x80)==0) return 0;
else return PEEK(KEY_DATA) & 0x7f;
#else
byte key;
byte const *keyptr = &key;
kickasm(uses keyptr, uses GETIN) {{
jsr GETIN
cmp #0
bne __keypress
lda #0
__keypress:
sta keyptr
}}
return key;
#endif
}
#ifdef APPLE1
#include <stdlib.h> // for memcpy
#define LOWRAM_START 0x280
#define LOWRAM_END 0x7FF
#define LOWRAM_SIZE (LOWRAM_END - LOWRAM_START + 1)
#define DATAINCODE (0x8000 - LOWRAM_SIZE)
inline void apple1_eprom_init() {
// copy the initializaton data from ROM to lowram where "Data" segment is allocated
memcpy(LOWRAM_START, DATAINCODE, LOWRAM_SIZE);
}
#endif