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Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:speed3ple:ecb-cassetteif Snapshot date: 2025-12-12 Generator : wayback-archiver
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ECB-Cassette IF
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Home made alu bracket for the 3.5mm jacks. I made both for 300 baud and checked if they could “talk” correctly to each other. (as in backup/restore). Turns out I had to measure&select the timing capacitor C2 very precise to get 100% reliable interchangeable operation. I have now “upgraded one of the board to 600baud. I will modify the bracket to include the send/receive activity LEDs. Info: This pcb has ground plane on both side so no problem with the screws. | img_20191015_174706small.jpg_cassette_if_300_and_600_baud |
| Cassette IF in action in a backplane-4: | |
Cassette IF signal out on Scope: This is the “Kansas City” standard, one of several cassette formats in use at the time (mid 70's). Kasas City format use an continuous audio stream of a tone and shift that tone between 2400hz and 1200hz to indicate 1 or 0. 8 cycles of 2400hz represent a “1” bit or a MARK and 4 cycles of 1200hz represent a “0” bit or a SPACE. | |
Cassette Interface in use: To send a file to tape: PIP PUN:=<filename.hex>[E] | |
| Cassette IF and technical document: | |
| Interconnecting 2 SBC and sending/receiving data through audio cable at 300baud: |
