126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
#ifndef APPLE1_H
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#define APPLE1_H
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#ifdef APPLE1
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// APPLE1
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const word WOZMON = 0xFF1F; // enters monitor
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const word ECHO = 0xFFEF; // output ascii character in A (A not destroyed)
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const word PRBYTE = 0xFFDC; // print hex byte in A (A destroyed)
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const word KEY_DATA = 0xd010; // read key
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const word KEY_CTRL = 0xd011; // control port
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const word TERM_DATA = 0xd012; // write ascii
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const word TERM_CTRL = 0xd013; // control port
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#else
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// VIC20
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const word ECHO = 0xFFD2; // chrout routine in kernal rom
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const word GETIN = 0xFFE4; // GETIN keyboard read routine
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#endif
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// prints a hex byte using the WOZMON routine
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void woz_print_hex(byte c) {
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#ifdef APPLE1
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asm {
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lda c
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jsr PRBYTE
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};
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#else
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asm {
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lda c
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jsr ECHO
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};
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#endif
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}
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// puts a character on the apple1 screen using the WOZMON routine
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void woz_putc(byte c) {
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asm {
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lda c
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jsr ECHO
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}
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}
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// puts a 0-terminated string on the apple1 screen
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void woz_puts(byte *s) {
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byte c;
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while(c=*s++) woz_putc(c);
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}
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// returns to WOZMON prompt
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void woz_mon() {
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#ifdef APPLE1
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asm {
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jmp WOZMON
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}
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#endif
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}
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// returns nonzero if a key has been pressed
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inline byte apple1_iskeypressed() {
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#ifdef APPLE1
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return PEEK(KEY_CTRL) & 0x80;
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#else
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return 0;
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#endif
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}
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// blocking keyboard read
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// reads a key from the apple-1 keyboard
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byte apple1_getkey() {
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#ifdef APPLE1
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asm {
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__wait:
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lda KEY_CTRL
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bpl __wait
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}
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return PEEK(KEY_DATA) & 0x7f;
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#else
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byte key;
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byte const *keyptr = &key;
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kickasm(uses keyptr, uses GETIN) {{
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__wait:
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jsr GETIN
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cmp #0
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beq __wait
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sta keyptr
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}}
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return key;
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#endif
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}
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// non blocking keyboard read
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// reads a key and return 0 if no key is pressed
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byte apple1_readkey() {
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#ifdef APPLE1
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if((PEEK(KEY_CTRL) & 0x80)==0) return 0;
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else return PEEK(KEY_DATA) & 0x7f;
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#else
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byte key;
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byte const *keyptr = &key;
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kickasm(uses keyptr, uses GETIN) {{
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jsr GETIN
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cmp #0
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bne __keypress
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lda #0
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__keypress:
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sta keyptr
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}}
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return key;
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#endif
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}
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#ifdef APPLE1
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#include <stdlib.h> // for memcpy
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#define LOWRAM_START 0x280
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#define LOWRAM_END 0x7FF
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#define LOWRAM_SIZE (LOWRAM_END - LOWRAM_START + 1)
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#define DATAINCODE (0x8000 - LOWRAM_SIZE)
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inline void apple1_eprom_init() {
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// copy the initializaton data from ROM to lowram where "Data" segment is allocated
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memcpy(LOWRAM_START, DATAINCODE, LOWRAM_SIZE);
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}
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#endif
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#endif |