Last Updated or created 2023-10-24
Started drawing a Cassette interface in Kicad.
This so i can read back my old cassettes with programs.
(And write some new stuff)
I’m planning to buy a small micro cassette player.
With schematic below, I’m going to use it as save/load device.
But also with the same player, I’m going to convert the tape to a wave file, and try to decode the program using python.
While I’m at it, reading the old manuals, a RS-232 interface would be nice also!
UPDATE 20231016
This is the final version
Information about the 7655A.
A eprom WITH IO ports! Amazing piece of history hardware.
Testing some sims on Linux and Android
Hi Henri,
I’m also busy on a cassette interface for the SDK-85.
Made a print for it, need to test it shortly.
If you like to have the Kicad schemes, mail me.
On the website you can find a SDK-85 emulator I made.
Best regards,
Dirk.
I’ve started drawing the interface in Kicad also, but if it is based on the same schematic, yes then i would like to have your Kicad files!.
Cool, that sdk-85 emulator you wrote!
https://github.com/ForNextSoftwareDevelopment/8085
Keep me informed of the interface is working
Some notes from our emails:
I can´t find my 8755, and don´t have a programmer for it.
TI688II eprom programmer doesn´t work.
Dirk has a ALL-11 programmer and managed to flash the chip.
He offered to burn one for me, so i’ll make him a print.
(He already has one, so he gets a spare)
We tried to find a cassette Rom, but to no avail.
But we got the source, so lets start typing (no way to ocr, scan quality is really bad)
I found sources of my own programs and Martin.
And a pdf about the BB-Board expansion. (with some schematics)
Maybe i’ll add a potmeter for R15 before ordering the pcb’s