On Tue, Feb 14, 2017 at 12:45 PM, Baltissen, GJPAA (Ruud) <ruud.baltissen@apg.nl> wrote: > > Hallo Bo, > > > > > > > i'm working in a google sheet here: https://docs.google.com/spreadsheets/d/1Gl0Q71u6fKLPRA9HQiSG8-xY8tPweMwXuy_UGQ1Iayo/edit?usp=sharing > > > > I should have been more precise: what ICs do you still need? > > > > And I have some remarks: > > - why using the 2364 and 2332? Now is your chance to use the better available 2764. Or even better, the 27256 or 27512 with the simple option changing the Kernal, Basic or charset using some jumpers. indeed, or better 2[89]Fxxx with some options to flash new image from external ports. > - why not using the 7801 instead of the 74629, 74193 and 4044? I know, the 7801 is rare, but not quite rare. And there is a replacement available. I also have no idea about the availability of the 629. What is the 7801 replacement? I have a working replacement with multiple chips (not using rare or out of production one) and working on a single chip replacement currently (but requiring both 3.3V and 1.8V supplies). > > > > An idea: use the 41256 instead of the 4164. IMHO it is better available. It only requires you to connect pin 1 of all 41256s to +5V using one pull-up resistor. It also give users of your board a possibility to upgrade to 256 KB. As an extra for these users: add another 74257 to be connected to this pin 1. no, just use a couple of 61256 (static), why use dynamic rams in 2017? Frank Message was sent through the cbm-hackers mailing listReceived on 2017-02-14 12:02:29
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