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back2root:ibm-pc-ms-dos:hardware:start [2023/01/14 15:03] – modification externe 127.0.0.1 | back2root:ibm-pc-ms-dos:hardware:start [2023/01/22 20:16] – modification externe 127.0.0.1 | ||
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===== Quick Jump ===== | ===== Quick Jump ===== | ||
- | <nspages -h1 -simpleList -exclude: | + | <nspages -h1 -simpleList |
[[back2root: | [[back2root: | ||
Ligne 66: | Ligne 66: | ||
===== 070h-07Fh - CMOS RAM ===== | ===== 070h-07Fh - CMOS RAM ===== | ||
- | | 070h | CMOS RAM/RTC, also NMI enable/ | + | | 070h | CMOS RAM/RTC, also NMI enable/ |
| 071h | CMOS RAM data (AT, | | 071h | CMOS RAM data (AT, | ||
Ligne 245: | Ligne 245: | ||
| 3A9h | On board 8251 | command/ | | 3A9h | On board 8251 | command/ | ||
- | ===== 3B0h-3BFh - Monochrome Display Adapter (write only, see ~6845~) ===== | + | ===== 3B0h-3BFh - Monochrome Display Adapter (write only) ===== |
| 3B0h | port address decodes to 3B4 | | | 3B0h | port address decodes to 3B4 | | ||
| 3B1h | port address decodes to 3B5 | | | 3B1h | port address decodes to 3B5 | | ||
| 3B2h | port address decodes to 3B4 | | | 3B2h | port address decodes to 3B4 | | ||
| 3B3h | port address decodes to 3B5 | | | 3B3h | port address decodes to 3B5 | | ||
- | | 3B4h | 6845 index register, selects which register [0-11h] is to be accessed through port 3B5 | | + | | 3B4h | [[back2root: |
- | | 3B5h | 6845 data register [0-11h] selected by port 3B4, registers 0C-0F may be read. If a read occurs without the adapter installed, FFh is returned. | + | | 3B5h | [[back2root: |
| 3B6h | port address decodes to 3B4 | | | 3B6h | port address decodes to 3B4 | | ||
| 3B7h | port address decodes to 3B5 | | | 3B7h | port address decodes to 3B5 | | ||
- | | 3B8h | 6845 Mode control register | + | | 3B8h | [[back2root: |
| 3B9h | reserved for color select register on color adapter | | 3B9h | reserved for color select register on color adapter | ||
| 3BAh | status register (read only) | | | 3BAh | status register (read only) | | ||
Ligne 280: | Ligne 280: | ||
| 3CEh | VGA graphics index | | | 3CEh | VGA graphics index | | ||
| 3CFh | Other VGA graphics | | 3CFh | Other VGA graphics | ||
+ | |||
+ | see [[ega-vga-registers|EGA/ | ||
===== 3D0h-3DFh - Color Graphics Monitor Adapter ===== | ===== 3D0h-3DFh - Color Graphics Monitor Adapter ===== | ||
<WRAP round info > | <WRAP round info > | ||
- | ports 3D0h-3DBh are write only, see 6845 | + | ports 3D0h-3DBh are write only, see [[back2root: |
</ | </ | ||