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@@ -61,10 +61,23 @@ probably have gone the flip-flop way. Seems more solid. |
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## Using the PS/2 interface |
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After having built and flashed the `glue.asm` supplied with this recipe, you end |
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up with a shell driven by the PS/2 keyboard (but it still outputs to ACIA). |
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There are still a few glitches, especially at initialization or at connect and |
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disconnect, but it otherwise works rather well! |
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To use this interface, you have to build a new Collapse OS binary. We'll use |
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the xcomp unit from the base recipe and modify it. |
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First, we need a `(ps2kc)` routine. In this case, it's easy, it's |
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`: (ps2kc) 8 PC@ ;`. Add this after ACIA loading. Then, we can load PS/2 |
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subsystem. You add `411 414 LOADR`. Then, at initialization, you add `PS2$` |
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after `ACIA$`. You also need to define `PS2_MEM` at the top. You can probably |
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use `RAMSTART + 0x7a`. |
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Rebuild, reflash, should work. For debugging purposes, you might not want to |
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go straight to plugging PS/2 `(key)` into the system. What I did myself was |
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to load the PS/2 subsystem *before* ACIA (which overrides with its own `(key)`) |
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and added a dummy word in between to access PS/2's key. |
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Also (and this is a TODO: investigate), I had a problem where the break key I |
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got from `(ps2kc)` was 0x70 instead of 0xf0 which had the effect of duplicating |
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all my keystrokes. I added a 0x70 -> 0xf0 replacement in my version of |
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`(ps2kc)`. Does the trick (at the cost of a non-functional numpad 0). |
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[avra]: https://github.com/hsoft/avra |
Virgil Dupras