Hi All, I am trying to get a CBM 710 into working shape. I recently acquired this from a collector, and my understanding is that is has never been up and running, it was incomplete from the start. There were a few missing chips and ROMs, but I think I'm basically down to the last part: new PSU. I am the US, the machine is from Germany. 240V (or maybe it's 220V) 50Hz vs 120V and 60Hz. I have enlisted the help of a long-time Commodore technician (I don't mean he worked for Commodore, I mean he has been repairing them for 20+ years and has his own shop still). I am entirely useless when it comes to anything more than the most basic circuit. I have been reading through a few relevant historical posts on CBM hackers, and looking through other stuff that Google reveals. So far, we have assembled the following: - ELM440 frequency generator. https://www.elmelectronics.com/ic/elm440/ - NTSC color burst crystal - Mean Well RT-125B power supply. http://www.meanwell.com/productPdf.aspx?i=491 The PSU seems like it should be fine for the power side of thing, but could someone help us with designing a circuit for the timing? I showed this diagram to the gentleman helping me, and he is scratching his head pretty furiously about it. http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/b/cbm700-ceag-PSU.jpg My goal here, aside from getting the CBM II back up and running, is to document it in case somebody else wants to do something similar in the future. I don't have a web site, so I am using a blog, here: http://www.vintageisthenewold.com/not-your-daddys-128-retrochallenge-2018-04-update-1/ Thanks, MicahReceived on 2018-04-13 22:00:02
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