Interest in OSI 495 Prototype Boards?

Klyball
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Re: Interest in OSI 495 Prototype Boards?

Post by Klyball »

Bill has a schematic for his memory board here http://osiweb.org/osiforum/viewtopic.php?f=3&t=180 it will give you a idea of one design , i have used a version successfully on my 510 system
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glitch
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Re: Interest in OSI 495 Prototype Boards?

Post by glitch »

Hah, replacement RAM boards have to be the most common use for OSI 495 protoboards! The other original I know of is currently a RAM board, and I've been contacted through eBay by several bidders with a, "I want to make a RAM board..." type questions :) And, that is, after all, pretty much what I wanted to do with one of these (plus a bit of other support stuff, since it's such a large board).

I was planning on doing a write-up for my RAM replacement (48K + 8K so one board even for CP/M), if it's something people are interested in I can do it as a step-by-step guide to building a RAM board.
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OSI Challenger 3, 510 CPU, 8" floppies, 23 MB hard disk system starting to work!
Parts bin Challenger 3 board set, never had a chassis in its time
lowrybt1
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Re: Interest in OSI 495 Prototype Boards?

Post by lowrybt1 »

Would be great to have a step-by-step guide!
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glitch
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Re: Interest in OSI 495 Prototype Boards?

Post by glitch »

Listed the remaining 3 spares:

http://www.ebay.com/itm/272173918152

$100 Buy It Now, feel free to make an offer. $100 each is a little less than what I have in them at this point. How quickly these go will probably determine if/when I do another run of them.

*** If you want one of these, please let me know! ***
Check out The Glitch Works
OSI Challenger 3, 510 CPU, 8" floppies, 23 MB hard disk system starting to work!
Parts bin Challenger 3 board set, never had a chassis in its time
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glitch
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Re: Interest in OSI 495 Prototype Boards?

Post by glitch »

I finally got to make a trip out to one of my vintage components suppliers yesterday, and returned with a box of 12-pin Molex KK-156 connectors! I'll be including a set of four natural nylon (the old translucent yellowish kind) connectors with the protoboards.
Check out The Glitch Works
OSI Challenger 3, 510 CPU, 8" floppies, 23 MB hard disk system starting to work!
Parts bin Challenger 3 board set, never had a chassis in its time
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glitch
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Re: Interest in OSI 495 Prototype Boards?

Post by glitch »

Alright, let's try this: $50 BIN, with connectors, plus shipping.
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OSI Challenger 3, 510 CPU, 8" floppies, 23 MB hard disk system starting to work!
Parts bin Challenger 3 board set, never had a chassis in its time
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glitch
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Re: Interest in OSI 495 Prototype Boards?

Post by glitch »

Posted a writeup on the creation: http://www.glitchwrks.com/2016/04/22/cloning-the-495

I've started working on a RAM board using one of the 495 boards, so a writeup with directions + schematic should be coming soon!
Check out The Glitch Works
OSI Challenger 3, 510 CPU, 8" floppies, 23 MB hard disk system starting to work!
Parts bin Challenger 3 board set, never had a chassis in its time
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