From: Nicolas Welte; address is valid for replies (Re:) only! (welte_spam_at_freenet.de)
Date: 2002-08-30 01:53:22
Hi everybody, some may remember that I announced some projects in the past. I finished one of them recently, and also documented another one that is in the works now. The one I finished is the PET Video Adaptor, a small board that converts the video signals from the Userport to a standard DSUB-9 socket for old digital RGB monitors. This is a version with buffers and inverters, so it actually gives a good picture. I have an older quick-and-dirty version with wires only that is just good enough to see if there is video output or not. Another one is almost finished, it just needs some more debugging done. It's the PETRAM, a board that goes into the 6502 socket of 4k to 32k PETs and CBMs (probably not expanded machines like 8096 and 8296) and replaces or expands the onboard RAM/ROM with 32kB SRAM and 128kB FlashROM. Especially useful for old 6540/6550 machines to get them running again and put the original chips into a safe place. As a companion to the PETRAM, I have the 6540 and 6550 replacement adaptors for the PET2001 video circuit. They're very much simplified and will not work to replace system RAMs and ROMs. I just made the PCB layouts and they are completely untested, so beware. Previews are available at the following address, together with documentation for the other projects: http://people.freenet.de/x1541/hardware/ Nicolas PS: For those who wonder: I also finished building the DIY GALblast programmer and it seems to work. I could write and verify a 20V8 GAL, but all the 16V8's I had lying around had no PES in them, so I couldn't try them. I'm now waiting for factory new chips to arrive. Before I verified the correct operation of the device with them, I will not try to read the GAL of the C128-Z80 accelerator with it. Message was sent through the cbm-hackers mailing list
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