jdm:pc9801:biosmem
Differences
This shows you the differences between two versions of the page.
| jdm:pc9801:biosmem [2021/12/25 12:28] – created asie | jdm:pc9801:biosmem [2021/12/25 15:10] (current) – asie | ||
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| Line 5: | Line 5: | ||
| ^ Address ^ Description ^ | ^ Address ^ Description ^ | ||
| | 0x401 | Extended memory between 0x100000 and 0xFFFFFF, in units of 128 KB | | | 0x401 | Extended memory between 0x100000 and 0xFFFFFF, in units of 128 KB | | ||
| - | | 0x501 | BIOS flags: bits 0-2 - conventional memory size, in units of 128 KB; bit 3 - 1 if high resolution system; bit 7 - 1 if 2.4576MHz timer; 0 if 1.9968MHz timer | | + | | 0x43B | bit 2 - 0 if memory hole between 15 and 16MB present, 1 otherwise; TODO | |
| + | | 0x501 | BIOS flags: bits 0-2 - conventional memory size, in units of 128 KB; bit 3 - 1 if high resolution system; bits 4-6 TODO; bit 7 - 1 if 2.4576MHz timer; 0 if 1.9968MHz timer | | ||
| | 0x52A-0x539 | Keyboard matrix | | | 0x52A-0x539 | Keyboard matrix | | ||
| | 0x538 | Keyboard shift status (see [[jdm: | | 0x538 | Keyboard shift status (see [[jdm: | ||
| | 0x594 - 0x595 | Extended memory above 0xFFFFFF, in units of 1 MB | | | 0x594 - 0x595 | Extended memory above 0xFFFFFF, in units of 1 MB | | ||
jdm/pc9801/biosmem.1640435331.txt.gz · Last modified: 2021/12/25 12:28 by asie