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Supoprt for tape images in the Absolute Loader format has been moved to the RAM component, so that those images can be preloaded into RAM in the same way that raw bootstrap images can; the RAM component now provides Absolute Loader image parsing as a service to other components that need it (specifically, the PC11 tape reader)

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Jeff Parsons 2016-10-19 11:10:38 -07:00 • committed by Jeff Parsons
commit 13a1dedbc7
21 changed files with 800 additions and 693 deletions
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16
modules/pc8080/lib/ram.js
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@ -66,8 +66,8 @@ function RAM8080(parmsRAM)
this.addrRAM = parmsRAM['addr'];
this.sizeRAM = parmsRAM['size'];
this.nFileLoad = parmsRAM['load'];
this.nFileExec = parmsRAM['exec'];
this.addrLoad = parmsRAM['load'];
this.addrExec = parmsRAM['exec'];
this.fInstalled = (!!this.sizeRAM); // 0 is the default value for 'size' when none is specified
this.fAllocated = false;
@ -197,8 +197,8 @@ RAM8080.prototype.doneLoad = function(sURL, sData, nErrorCode)
if (resource) {
this.abInit = resource.aBytes;
this.aSymbols = resource.aSymbols;
if (this.nFileLoad == null && resource.nLoad != null) this.nFileLoad = resource.nLoad;
if (this.nFileExec == null && resource.nExec != null) this.nFileExec = resource.nExec;
if (this.addrLoad == null) this.addrLoad = resource.addrLoad;
if (this.addrExec == null) this.addrExec = resource.addrExec;
} else {
this.sFilePath = null;
}
@ -232,19 +232,19 @@ RAM8080.prototype.initRAM = function()
if (!this.abInit || !this.bus) return;
var addr = this.addrRAM;
if (this.nFileLoad !== null) addr = this.nFileLoad;
if (this.addrLoad !== null) addr = this.addrLoad;
for (var i = 0; i < this.abInit.length; i++) {
this.bus.setByteDirect(addr + i, this.abInit[i]);
}
if (this.nFileExec !== null) {
if (this.addrExec !== null) {
/*
* Here's where we enable our "Fake CP/M" support, triggered by the user loading a "writable" ROM image
* at offset 0x100. Fake CP/M support works by installing HLT opcodes at well-known CP/M addresses
* (namely, 0x0000, which is the CP/M reset vector, and 0x0005, which is the CP/M system call vector) and
* then telling the CPU to call us whenever a HLT occurs, so we can check PC for one of these addresses.
*/
if (this.nFileExec == RAM8080.CPM.INIT) {
if (this.addrExec == RAM8080.CPM.INIT) {
for (i = 0; i < RAM8080.CPM.VECTORS.length; i++) {
this.bus.setByteDirect(RAM8080.CPM.VECTORS[i], CPUDef8080.OPCODE.HLT);
}
@ -255,7 +255,7 @@ RAM8080.prototype.initRAM = function()
};
}(this));
}
this.cpu.setReset(this.nFileExec);
this.cpu.setReset(this.addrExec);
}
/*