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This commit is contained in:
Jeff Parsons 2016-03-25 22:02:56 -07:00
commit cb96688e04
1 changed files with 5 additions and 4 deletions
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9
modules/pcjs/lib/chipset.js
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@ -866,13 +866,14 @@ ChipSet.DIPSW[1][ChipSet.MODEL_5150][ChipSet.SWITCH_TYPE.EXPMEM] = {
576: 0x12
/*
* Obviously, more bit combinations are possible here (up to 0x1F), but assuming a minimum of 64Kb already on
* the motherboard, any amount of expansion memory about 576Kb would break the 640Kb barrier. If you stuck with
* MDA or CGA video cards, perhaps you could go as high as 704Kb in a real system. But in our happy little
* world, this is where we stop.
* the motherboard, any amount of expansion memory above 576Kb would break the 640Kb barrier. Yes, if you used
* only MDA or CGA video cards, you could go as high as 704Kb in a real system. But in our happy little world,
* this is where we stop.
*
* TODO: A value larger than 0x12 usually comes from a misconfigured machine (ie, it forgot to leave SW2[5] ON).
* To compensate, when getDIPMemorySize() gets null back from its EXPMEM request, perhaps it should try truncating
* the DIP switch value.
* the DIP switch value. However, that would introduce a machine-specific hack into a function that's supposed
* be machine-independent now.
*/
},
LABEL: "Expansion Memory (32Kb Increments)"