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(docs) readme - Change keypad reference to a side-by-side layout

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n loewen 2023-08-21 10:42:36 +01:00
parent c5c64e5cd5
commit 9fa1bf5392
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notes/2023-08-21--dev-notes.md
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@ -31,7 +31,7 @@
- cpu: accept an optional debugging array, print line # and statement - cpu: accept an optional debugging array, print line # and statement
- readme: - readme:
- [x] readme: rename (or split up?) mem map / peripherals section - [x] readme: rename (or split up?) mem map / peripherals section
- [ ] ? readme: put 2 keypad charts side by side (they would fit on my phone) - [x] ? readme: put 2 keypad charts side by side (they would fit on my phone)
- [/] see paper notes on mem map - [/] see paper notes on mem map

18
readme.md
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@ -85,21 +85,15 @@ With single stepping + verbose debugging output:
The value of the latest keypress on a hex keypad is stored at `$20`. The value of the latest keypress on a hex keypad is stored at `$20`.
(The keypad can also be relocated by changing the value of the pointer-to-keypad at `$22`.) (The keypad can also be relocated by changing the value of the pointer-to-keypad at `$22`.)
The keypad uses the same layout as the COSMAC VIP (and CHIP-8): The keypad uses the same layout as the COSMAC VIP (and CHIP-8). The CPU simulator maps those keys onto a Qwerty set.
``` ```
1 2 3 C 1 2 3 C 1 2 3 4
4 5 6 D 4 5 6 D Q W E R
7 8 9 E 7 8 9 E A S D F
A 0 B F A 0 B F Z X C V
```
The CPU simulator maps the following Qwerty keys onto those values:
``` VIP simulator
1 2 3 4
Q W E R
A S D F
Z X C V
``` ```
## Assembly language ## Assembly language