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View Full Version : I overclocked my IBM 5150...



Retro Canada
November 25th, 2017, 09:41 PM
I got the PC-Sprint schematics and designed a new pc-sprint board. Got the parts from jameco (they still have 8284a) and voila.... but my DRAM's are all 200ns! bummer, So the 22.1Mhz didn't work, I got a all sorts of parity error. So I got the highest oscillator here 17.43 and it worked :D I will buy other frequencies until I find the limit for my machine...

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here the KiCad files for whomever wants it:

https://sites.google.com/site/tandycocoloco/dropbox/PC-SPRINT.zip?attredirects=0&d=1

krebizfan
November 25th, 2017, 10:11 PM
Can you successfully use cassettes with the overclocked 5150? I am serious. I remember the question of CPU speed versus the cassette interface coming up a few times in the past so this might be the best chance to prove things.

Retro Canada
November 25th, 2017, 10:33 PM
Oh please don't make me do it :) Luckly I don't have the cable and I hope it's not the same for the TRS-80 Color...

Retro Canada
November 25th, 2017, 10:37 PM
Oh please don't make me do it :) Luckly I don't have the cable and I hope it's not the same for the TRS-80 Color...

Oh boy looks like it does .... ok one day when I am bored to death I will get my cassette and try it.... hope this day never comes