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Initial scaffolding for paged memory

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This commit is contained in:
Jeff Parsons 2015-04-28 17:45:29 -07:00 • committed by jeffpar
commit 6108fb25ab
8 changed files with 431 additions and 276 deletions
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16
modules/pcjs/lib/ram.js
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@ -383,13 +383,14 @@ CompaqController.RAMSETUP = {
};
/**
* readByte(off)
* readByte(off, addr)
*
* @this {Memory}
* @param {number} off (relative to 0x80C00000)
* @param {number} [addr]
* @return {number}
*/
CompaqController.readByte = function readCompaqControllerByte(off)
CompaqController.readByte = function readCompaqControllerByte(off, addr)
{
var b = 0xff;
if (off < 0x02) {
@ -400,19 +401,20 @@ CompaqController.readByte = function readCompaqControllerByte(off)
}
if (DEBUG) {
this.controller.ram.printMessage("CompaqController.readByte(" + str.toHexWord(off) + ") returned " + str.toHexByte(b), true, true);
if (MAXDEBUG && DEBUGGER && off >= 0x2) this.cpu.stopCPU();
if (MAXDEBUG && DEBUGGER && off >= 0x2) this.dbg.stopCPU();
}
return b;
};
/**
* writeByte(off, b)
* writeByte(off, b, addr)
*
* @this {Memory}
* @param {number} off (relative to 0x80C00000)
* @param {number} b
* @param {number} [addr]
*/
CompaqController.writeByte = function writeCompaqControllerByte(off, b)
CompaqController.writeByte = function writeCompaqControllerByte(off, b, addr)
{
var controller = this.controller;
@ -443,7 +445,7 @@ CompaqController.writeByte = function writeCompaqControllerByte(off, b)
}
}
controller.wMappings = (controller.wMappings & ~0xff) | b;
if (MAXDEBUG && DEBUGGER) this.cpu.stopCPU();
if (MAXDEBUG && DEBUGGER) this.dbg.stopCPU();
}
}
/*
@ -451,7 +453,7 @@ CompaqController.writeByte = function writeCompaqControllerByte(off, b)
*/
else if (off == 0x2) {
controller.wRAMSetup = (controller.wRAMSetup & ~0xff) | b;
if (MAXDEBUG && DEBUGGER) this.cpu.stopCPU();
if (MAXDEBUG && DEBUGGER) this.dbg.stopCPU();
}
/*
* All bits in 0x80C00001 and 0x80C00003 are reserved, so we can simply ignore those writes.