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More details on the A20 problem with the DeskPro 386 ROM

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Jeff Parsons 2015-04-17 18:58:54 -07:00 • committed by jeffpar
commit 10202ccef5
7 changed files with 1340 additions and 1228 deletions
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modules/pcjs/lib/x86cpu.js
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@ -660,7 +660,7 @@ X86CPU.prototype.initMemory = function(aMemBlocks, blockShift, blockLimit, block
* it's hard to imagine any real-world protected-mode code relying on A20 being off. However, that
* doesn't change the fact that this hack should NOT be necessary.
*
* TODO: Figure out why the DeskPro 386 ROM BIOS misbehaves under emulation, necessitating this hack.
* TODO: Figure out why the DeskPro 386 ROM BIOS misbehaves under emulation, and eliminate this hack.
*
* @this {X86CPU}
* @param {boolean} fEnable is true to enable A20, false to disable