174 lines
4.0 KiB
C
174 lines
4.0 KiB
C
#ifndef APPLE1_H
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#define APPLE1_H
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#pragma encoding(ascii) // encode strings in plain ascii
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#ifdef APPLE1_USE_WOZ_MONITOR
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#pragma zp_reserve(0x24) // XAML Last "opened" location Low
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#pragma zp_reserve(0x25) // XAMH Last "opened" location High
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#pragma zp_reserve(0x26) // STL Store address Low
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#pragma zp_reserve(0x27) // STH Store address High
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#pragma zp_reserve(0x28) // L Hex value parsing Low
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#pragma zp_reserve(0x29) // H Hex value parsing High
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#pragma zp_reserve(0x2A) // YSAV Used to see if hex value is given
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#pragma zp_reserve(0x2B) // MODE $00=XAM, $7F=STOR, $AE=BLOCK XAM
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#endif
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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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const word INBUFFER = 0x0200; // woz monitor input buffer
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const word INBUFSIZE = 0x80; // woz monitor input buffer size
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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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asm {
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lda c
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jsr PRBYTE
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};
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}
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// print hex word
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void woz_print_hexword(word w) {
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woz_print_hex(*((byte *)&w+1));
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woz_print_hex(*((byte *)&w));
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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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asm {
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jmp WOZMON
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}
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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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return PEEK(KEY_CTRL) & 0x80;
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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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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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}
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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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if((PEEK(KEY_CTRL) & 0x80)==0) return 0;
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else return PEEK(KEY_DATA) & 0x7f;
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}
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void apple1_input_line(byte *buffer, byte max) {
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byte x=0;
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while(1) {
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byte c = apple1_getkey();
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buffer[x] = c;
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if(c==13) {
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// RETURN ends input
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break;
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}
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else if(c==27) {
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// ESC clears the string
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x=0;
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break;
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}
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else if(c==8 || c=='_') {
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// BACKSPACE
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if(x != 0) {
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woz_putc('_');
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x--;
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}
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}
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else {
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// character input
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if(x<max) {
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woz_putc(c);
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x++;
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}
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}
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}
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buffer[x]=0;
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}
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#ifndef INPUT_LINE_PROMPT_CHAR
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#define INPUT_LINE_PROMPT_CHAR '>'
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#endif
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void apple1_input_line_prompt(byte *buffer, byte max) {
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byte x=0;
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woz_putc(INPUT_LINE_PROMPT_CHAR);
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while(1) {
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byte c = apple1_getkey();
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buffer[x] = c;
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if(c==13) {
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// RETURN ends input
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break;
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}
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else if(c==27) {
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// ESC clears the string
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x=0;
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break;
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}
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else if(c==8 || c=='_') {
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// BACKSPACE
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if(x != 0) {
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x--;
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buffer[x] = 0;
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woz_putc('\r');
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woz_putc(INPUT_LINE_PROMPT_CHAR);
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woz_puts(buffer);
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}
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}
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else {
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// character input
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if(x<max) {
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woz_putc(c);
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x++;
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}
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}
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}
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buffer[x]=0;
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}
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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((byte *)LOWRAM_START, (byte *)DATAINCODE, LOWRAM_SIZE);
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}
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#endif
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