https://github.com/tlindner/coco_key_test

Three short programs to test the Color Computer keyboard
https://github.com/tlindner/coco_key_test

Last synced: 11 months ago
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Three short programs to test the Color Computer keyboard

• Host: GitHub
• URL: https://github.com/tlindner/coco_key_test
• Owner: tlindner
• Created: 2024-08-05T01:43:37.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2025-05-17T22:15:24.000Z (about 1 year ago)
• Last Synced: 2025-05-17T23:19:59.831Z (about 1 year ago)
• Language: Assembly
• Size: 36.1 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: ReadMe.md

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README

          
Color Computer Keyboard Test

![CoCo Key Test](https://github.com/user-attachments/assets/7cf4db0f-436a-4ae5-9909-a96adf1bd098)

This is three programs that run on your color computer to test the keyboard.

From the provided disk image, type `RUN "KT` to run the program chooser.

## Forward

This program rolls output bits thru the B port of PIA 0 looking for a pressed key by reading the A port and looking for low bits. If a key is detected it's symbol is reversed. Joystick buttons are also ckecked.

## Backward

This program rolls out bits on port A, looking for pressed keys by reading port B.

## CoCo 3 interrupt

This program does nothing until a keyboard interrupt is generated. Then the joystick buttons are check and possible updated. If no joystick buttons were press port B is rolled one bit at a time and port A is read looking for a low bit. If a key press is detected it's symbol is reversed. A count is kept of the number of interrupts generated.

## Raw ROM

This is a ROMable version of the forward keyboard test program.

--

tim lindner

August 2024

tlindner@macmess.org