[Coco] Diagnostic Cartridge

[Alex Evans]

BASIC ROM - gives CRC
EXPANSION ROM - gives CRC
RAM Data - tests RAM (up to 16k?)
RAM Addr - tests RAM (up to 16k?)
VIdeo - goes through video modes
RS-232 - I haven't really looked at it, but I presume a loopback test for
the serial port
Sound - plays some sounds using the 6-bit DAC
Cassette - I'm not sure
Keyboard - shows the key pressed and plays an accompanying tone
Joystick - moves a dot according to one of the joysticks
Printer - Prints to the serial port

On Mon, Nov 24, 2025 at 2:45 PM Allen Huffman via Coco <coco at maltedmedia.com>
wrote:

>
> On Nov 24, 2025, at 10:10 AM, Alex Evans via Coco <coco at maltedmedia.com>
> wrote:
> >
> > It is at: https://github.com/varmfskii/cocodia
>
> Starred. What all did the one from Radio Shack test? That’s one cart I
> don’t think I’ve ever seen.
>
> --
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