From: Ethan Dicks (erd_at_infinet.com)
Date: 2002-10-01 05:49:24
Progress on the old 2001N - It seems that both tape drives work with a variety of tapes on the internal (#2) port, but neither works on the external port. From perusing the schematics, the guilty part(y) would seem to be a PIA - TAPE #1 READ goes right into it, while TAPE #2 READ goes to the VIA. I'm using a new 68B21. I have already replaced the socket with a machined-pin one. Using a logic probe, I can see tape data at the edge connector _and_ on the right pin on the PIA. Seeing as the rest of the machine seems to work perfectly, I somehow have a bad input on a new chip. :-( As to the recent comment about no confirmation on substituting 6821s for 6520s, I was planning on reporting that things worked once I proved to _myself_ that things worked. So far, I'm not up to 100%, so I've been waiting for my own confirmation. Glad to hear someone else has tried it and it worked. I have captured the Rabbit application from my original tape (at $7800) and from ROM (at $B800). Once I dump the 2031 floppy, I can put them up on funet (along with MicroMon, Basic-Aid and a BASIC Toolkit) if that's the appropriate thing to do. -ethan -- Visit "The Seventh Continent" http://penguincentral.com/penguincentral.html Message was sent through the cbm-hackers mailing list
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