From: Marko Mäkelä (msmakela_at_gmail.com)
Date: 2008-11-17 20:39:22
On Mon, Nov 17, 2008 at 10:41:09AM -0600, Jim Brain wrote: > donni wrote: > >This schematic on lycos: > >http://members.lycos.nl/ijmtu/hpbimg/MAX%20machine%20schematic.jpg > >was reversed egineerd from a MAX machine I had sitting in front of me. > >Why not use that one instead of a schematic full of errors, made from > >some unreadable copy? > >Also the schematic on zimmers.net is not what is inside any max > >machine I ever seen, maybe it's the schematic for the very first > >version of the MAX machine ?? > I woulc concur. Use this one (copyright holder agrees) and remove the > other one. Better yet, archive the reverse engineered one as well, with a note saying that it is based on real (and most likely revised) hardware. In 1999, I posted some observations of the UltiMax and the original schematic at http://www.funet.fi/pub/cbm/html/c64/ultimax.html which now redirects to http://www.zimmers.net/anonftp/pub/cbm/html/c64/ultimax.html at Bo Zimmerman's site. Feel free to copy that information to other pages, in case there is something that is not mentioned at http://www.floodgap.com/retrobits/ckb/secret/ultimax.html. Please note that I have never seen a MAX machine, or even examined the MAX BASIC cartridge ROM to verify my assumptions about the clock speed and so on. The above schematic on Lycos shows the clock divider circuit that is familiar from the C64: the dot clock being 14.318181 MHz divided by 14 and multiplied by 8. In the schematic that Ruud made readable, there are two crystals: the 14.318181 MHz for the NTSC color clock and an 8 MHz one for dot clock. Marko Message was sent through the cbm-hackers mailing list
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