Internal Port Decoding b0-7 Register: Difference between revisions
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|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
|ShortDesc=Enabling internal ports | |ShortDesc=Enabling internal ports decoding | ||
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Revision as of 09:07, 12 November 2019
| Next Register Number | $82 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Enabling internal ports decoding |
| Bit | Description |
|---|---|
| 7 | Enabling IO:$xx37 (also MD2 controller) |
| 6 | Enabling IO:$xx1F (also MD1 controller) |
| 5 | Enabling IO:$xx6B |
| 4 | Enabling +3 floating bus |
| 3 | Enabling IO:$1FFD |
| 2 | Enabling IO:$DFFD |
| 1 | Enabling IO:$7FFD |
| 0 | Enabling IO:$xxFF |
All bits are set to 1 upon soft reset.
(note: Next registers with number higher than $7F are inaccessible from Copper code)