mirror of https://github.com/trudnai/Steve2.git
353 lines
9.0 KiB
C
353 lines
9.0 KiB
C
//
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// woz.c
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// A2Mac
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//
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// Created by Tamas Rudnai on 2/15/20.
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// Copyright © 2020 GameAlloy. All rights reserved.
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//
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#include <stdlib.h>
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#include "woz.h"
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#include "disk.h"
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#include "6502.h"
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#include "common.h"
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WOZread_t WOZread = {0};
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uint8_t WOZlatch = 0;
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int trackOffset = 0;
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int bitOffset = 0;
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uint64_t clkelpased;
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woz_header_t woz_header;
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woz_chunk_header_t woz_chunk_header;
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woz_tmap_t woz_tmap;
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woz_trks_t woz_trks;
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int track_loaded = -1;
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#pragma pack(push, 1)
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typedef union trackEntry_u {
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struct {
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uint8_t data;
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uint8_t shift;
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};
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uint16_t shift16;
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} trackEntry_t;
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#pragma pack(pop)
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trackEntry_t prepared_track[WOZ_TRACK_BYTE_COUNT];
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typedef enum readState_e {
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readNormal = 0,
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readHold,
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} readState_t;
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readState_t readState = readNormal;
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uint8_t readLatch;
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void woz_loadTrack( int track ) {
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trackEntry_t reg = {0};
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reg.shift = woz_trks[track].data[0];
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reg.data = woz_trks[track].data[1];
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prepared_track[0] = reg;
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for ( int offs = 1; offs < WOZ_TRACK_BYTE_COUNT; offs++ ) {
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for ( int i = 0; i < 8; i++ ) {
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if (reg.shift & 0x80) {
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reg.shift = 0;
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}
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reg.shift16 <<= 1;
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}
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reg.data = woz_trks[track].data[ (offs + 1) % WOZ_TRACK_BYTE_COUNT ];
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prepared_track[offs] = reg;
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}
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}
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uint8_t woz_read() {
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int track = woz_tmap.phase[disk.phase.count];
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if (outdev) fprintf(outdev, "track: %d (%d) ", track, disk.phase.count);
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if ( track >= 40 ) {
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dbgPrintf("TRCK TOO HIGH!\n");
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return rand();
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}
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if ( track != track_loaded ) {
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woz_loadTrack(track);
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track_loaded = track;
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}
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#ifdef WOZ_REAL_SPIN
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WOZread.shift32 = 0;
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bitOffset = (m6502.clktime >> 2) & 7;
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trackOffset = (m6502.clktime >> 5) % WOZ_TRACK_BYTE_COUNT;
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WOZread.next = woz_trks[track].data[ (trackOffset +1) % WOZ_TRACK_BYTE_COUNT ];
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WOZread.data = woz_trks[track].data[ trackOffset ];
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WOZread.prev = woz_trks[track].data[ (trackOffset -1) % WOZ_TRACK_BYTE_COUNT ];
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WOZread.shift = woz_trks[track].data[ (trackOffset -2) % WOZ_TRACK_BYTE_COUNT ];
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printf("clk:%llu bo:%u to:%u W:%08X\n", m6502.clktime, bitOffset, trackOffset, WOZread.shift32);
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uint8_t state = 0;
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// simulating the continous shift register in Disk ][
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for (int i = bitOffset + 16; i; --i) {
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WOZread.shift32 <<= 1;
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switch (state) {
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case 0:
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WOZlatch = WOZread.shift;
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if ( WOZread.valid ) {
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state = 1;
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WOZread.shift = 0;
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}
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break;
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case 1:
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// we do not latch the shift register for one 4us cycle
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state = 0;
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break;
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default:
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// this should not happen
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state = 0;
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break;
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}
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// printf("shft1: W:%08X L:%02X\n", WOZread.shift32, WOZlatch);
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}
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printf("clk:%llu bo:%u to:%u W:%08X B:%02X\n", m6502.clktime, bitOffset, trackOffset, WOZread.shift32, WOZlatch);
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if ( WOZlatch & 0x80 ) {
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printf("WOZlatch: %02X\n", WOZlatch);
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static int readState = 0;
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static int vol = 0;
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static int trk = 0;
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static int sec = 0;
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switch (readState) {
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case 0:
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if ( 0xD5 == WOZlatch ) readState = 1;
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else readState = 0;
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break;
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case 1:
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if ( 0xAA == WOZlatch ) readState = 2;
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else readState = 0;
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break;
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case 2:
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if ( 0x96 == WOZlatch ) {
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readState = 3;
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printf("sector header marker\n");
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}
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else if ( 0xAD == WOZlatch ) {
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readState = 10;
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printf("sector data marker\n");
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}
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else readState = 0;
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break;
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case 3: // sector header, vol number 1
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readState++;
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vol = (WOZlatch << 1) | 1;
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break;
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case 4: // sector header, vol number 2
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readState++;
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vol &= WOZlatch;
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printf("vol:%u ", vol);
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break;
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case 5: // sector header, trk number 1
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readState++;
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trk = (WOZlatch << 1) | 1;
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break;
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case 6: // sector header, trk number 2
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readState++;
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trk &= WOZlatch;
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printf("trk:%u ", trk);
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break;
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case 7: // sector header, sec number 1
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readState++;
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sec = (WOZlatch << 1) | 1;
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break;
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case 8: // sector header, sec number 2
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readState = 0;
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sec &= WOZlatch;
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printf("sec:%u\n", sec);
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break;
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default:
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readState = 0;
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break;
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}
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}
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// switch ( WOZlatch ) {
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// case 0xAA:
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// case 0x96:
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//// printf("%02X ", WOZlatch);
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// printf("clk:%llu bo:%u to:%u B:%02X\n", m6502.clktime, bitOffset, trackOffset, WOZlatch);
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// break;
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//
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// default:
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// break;
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// }
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return WOZlatch;
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#elif defined( WOZ_REAL_SPIN2 )
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// clkelpased = m6502.clktime - disk.clk_last_read;
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// disk.clk_last_read = m6502.clktime;
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bitOffset = (m6502.clktime >> 2) & 7;
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trackOffset = (m6502.clktime >> 5) % WOZ_TRACK_BYTE_COUNT;
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trackEntry_t reg = prepared_track[trackOffset];
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do {
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switch (readState) {
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case readNormal:
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readLatch = reg.shift;
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break;
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case readHold:
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default:
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readState = readNormal;
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break;
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}
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if (reg.shift & 0x80) {
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reg.shift = 0;
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readState = readHold;
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}
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reg.shift16 <<= 1;
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} while ( --bitOffset > 0 );
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printf("READ: clk:%llu to:%u bo:%llu B:%02X\n", m6502.clktime, trackOffset, (m6502.clktime >> 2) & 7, readLatch);
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return readLatch;
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#else // WOZ_REAL_SPIN
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clkelpased = m6502.clktime - m6502.clklast;
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m6502.clklast = m6502.clktime;
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if ( clkelpased > 100 ) {
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// printf("NEED SYNC : %llu\n", clkelpased);
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bitOffset = (clkelpased >> 2) & 7;
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trackOffset += ((clkelpased >> 5) +100) % WOZ_TRACK_BYTE_COUNT;
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WOZread.data = woz_trks[track].data[trackOffset];
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}
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// to avoid infinite loop and to search for bit 7 high
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for ( int i = 0; i < WOZ_TRACK_BYTE_COUNT * 8; i++ ) {
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if ( ++bitOffset >= 8 ) {
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bitOffset = 0;
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// if ( ++trackOffset >= WOZ_TRACK_BYTE_COUNT ) {
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// trackOffset = 0;
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// }
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trackOffset++;
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trackOffset %= WOZ_TRACK_BYTE_COUNT;
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// printf("offs:%u\n", trackOffset);
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WOZread.data = woz_trks[track].data[trackOffset];
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}
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WOZread.shift16 <<= 1;
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if ( WOZread.valid ) {
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uint8_t byte = WOZread.shift;
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// printf("%02X ", byte);
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WOZread.shift = 0;
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if (outdev) fprintf(outdev, "byte: %02X\n", byte);
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return byte;
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}
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}
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if (outdev) fprintf(outdev, "TIME OUT!\n");
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return rand();
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#endif // WOZ_REAL_SPIN
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}
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void woz_loadFile( const char * filename ) {
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FILE * f = fopen(filename, "rb");
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if (f == NULL) {
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perror("Failed: ");
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return;
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}
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fread( &woz_header, 1, sizeof(woz_header_t), f);
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if ( woz_header.magic != WOZ1_MAGIC ) {
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return;
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}
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while ( ! feof(f) ) {
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// beginning of the chunk, so we can skip it later
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long r = fread( &woz_chunk_header, 1, sizeof(woz_chunk_header_t), f);
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if ( r != sizeof(woz_chunk_header_t) ) {
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break;
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}
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long foffs = ftell(f);
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void * buf = NULL;
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switch ( woz_chunk_header.magic ) {
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case WOZ_INFO_CHUNK_ID:
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break;
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case WOZ_TMAP_CHUNK_ID:
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buf = &woz_tmap;
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break;
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case WOZ_TRKS_CHUNK_ID:
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buf = woz_trks;
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break;
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case WOZ_META_CHUNK_ID:
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break;
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default:
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break;
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}
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if (buf) {
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r = fread( buf, 1, woz_chunk_header.size, f);
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if ( r != woz_chunk_header.size ) {
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break;
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}
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}
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// make sure we are skipping unhandled chunks correctly
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fseek(f, foffs + woz_chunk_header.size, SEEK_SET);
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}
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fclose(f);
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}
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