From: Bil Herd (bherd_at_ids-business.com)
Date: 2007-03-29 01:55:29
Ok, Jeri Ellsworth got me interested in what the heck y'all are doing digging up old machines including ones I completely forgot even existed. After reading backwards through the posts I'd say you guys were right on the money regarding details and oddities of the software developer version of the TED. Maybe it will come to me what case we stuck them in, someone could beat me to it by comparing it to VIC and C64 dimensions. The diodes were 1N4148 silicon. The 8529 came later, probably as a result of testing with this system as I caught he problem relatively early, this board pretty much superseded the working silicon as I didn't see much reason to wirewrap one when I could make PCB's for 20 given that I was waiting on good silicon. There was a wirewarap version when I first got to CBM, it was based on a VIC chip which had nothing to do with TED, I pretty much unplugged it and set it aside my first day on the project. Not that this is a two sided pcb, it was hand taped on mylar. The QA is the QA of the PCB fabrication and had nothing to do with production, it would have been stuffed by the R&D technicians who also soldered the diodes to TED. What a blast... I wrote those labels 24 years ago at the age of 24. I probably burned the ROMs myself for the run (good way to remove grumbling when the code changed) So here is a quiz for all of you retro-junkies. Look at the picture that was previously posted by B. Degnan http://www.vintagecomputer.net/commodore/c116/c-116_mboard_hi-res.jpg This is truly vintage Commodore, this is where Westchester/King of Prussia design met the Japanese re-designers and I learned a cool trick in the process. See R10, the 20 Ohm 5W resistor on the left? The one that looks really out of place on a computer board. The question is: What does this part do? Why does it work? Let me know you need help getting that software-developer TED working. Kind regards, Bil Herd Message was sent through the cbm-hackers mailing list
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