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c64: decode SYS value for start addr, fix SYS xxxx kbd sticky issue

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This commit is contained in:
Steven Hugg 2023-05-18 18:26:37 -05:00
parent 61443f586f
commit 5d11dd37df
1 changed files with 20 additions and 5 deletions
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23
src/machine/c64.ts
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@ -44,23 +44,38 @@ export class C64_WASMMachine extends BaseWASMMachine
this.prgstart = this.romarr[0] + (this.romarr[1]<<8); // get load address
// look for BASIC program start
if (this.prgstart == 0x801) {
// decode SYS address from decimal?
if (this.romarr[6] == 0x9e) {
var addr = 0;
for (var i=0; i<5; i++) {
var ch = this.romarr[7+i];
if (ch == 0x9b || ch == 0) break;
addr = addr * 10 + (ch & 0xf);
}
this.prgstart = addr;
console.log("SYS", addr, hex(addr));
} else {
this.prgstart = this.romarr[2] + (this.romarr[3]<<8) + 2; // point to after BASIC program
console.log("prgstart", hex(this.prgstart));
console.log("RUN", this.prgstart, hex(this.prgstart));
}
}
// is program loaded into RAM?
if (this.prgstart < 0x8000) {
// advance BIOS a few frames
this.exports.machine_exec(this.sys, 250000);
// type in command (SYS 2061)
var cmd = "\rSYS "+this.prgstart+"\r";
var cmd = "\rSYS "+this.prgstart;
for (var i=0; i<cmd.length; i++) {
var key = cmd.charCodeAt(i);
this.exports.machine_exec(this.sys, 20000);
this.exports.machine_exec(this.sys, 30000);
this.exports.machine_key_down(this.sys, key);
this.exports.machine_exec(this.sys, 5000);
this.exports.machine_exec(this.sys, 30000);
this.exports.machine_key_up(this.sys, key);
this.exports.machine_exec(this.sys, 1); // chips/kbd.c has a "sticky counter"
}
// advance clock until program starts
this.exports.machine_key_down(this.sys, 13);
this.exports.machine_exec(this.sys, 1); // chips/kbd.c has a "sticky counter"
for (var i=0; i<100000 && this.getPC() != this.prgstart; i++) {
this.exports.machine_tick(this.sys);
}