The OSI C4P Page

[Steve Gray]

Hi,

My name is Steve and the OSI C4P was my fist computer, purchased in 1981. I live in Markham, Ontario which is just north of Toronto, Canada.

I have a web page dedicated to the C4P here and related info. Check it out if you can.

My C4P is curently working and includes a D&N floppy controller and drive. I have the TOSIE hacker board and mittendorf hi-res graphics board which were working last time I checked but are not currently installed. I also have a Superboard which is currently not functional but I hope to restore if time permits.

Glad to see this forum back up again as there seem to be fewer and few of us remaining and lots of old info and knowledge will be lost of we don't make an effort to preserve it.

Steve

[dave]

Thanks for sharing your site. I've linked to it on the main page. I am very interested in the Mittendorf board, as I had hacked a high-res mod for the 540 board, basically a 16K RAM board which multiplexed the 540 board video timing divider chain outputs with the address lines, and the data lines connected to a shift register, which was conditionally combined with the 540 shift register output. This was messy, basically hung off the 540 board with wire-wrap wire connects. Unfortunately, that hack is long lost. That was before I found out about the Mittendorf board, otherwise I might have just splurged. I'd love photos, schematics, and written docs, if you have them.

I'd also love any info you have on the D&N board and the TOSIE board.

Dave

[Steve Gray]

Thanks for sharing your site. I've linked to it on the main page. I am very interested in the Mittendorf board, as I had hacked a high-res mod for the 540 board, basically a 16K RAM board which multiplexed the 540 board video timing divider chain outputs with the address lines, and the data lines connected to a shift register, which was conditionally combined with the 540 shift register output. This was messy, basically hung off the 540 board with wire-wrap wire connects. Unfortunately, that hack is long lost. That was before I found out about the Mittendorf board, otherwise I might have just splurged. I'd love photos, schematics, and written docs, if you have them.

I'd also love any info you have on the D&N board and the TOSIE board.

Dave

Thanks for the link.

The OSI machines were very hackable. Sounds like you really got into it. I was only at the level of being able to solder and follow instructions when it came to hardware. I couldn't design anything myself. Programming on the other hand came naturally

I've dug out my documentation binders and can't find anything at all about the D&N board or the Mittendorf board... It's funny, the D&N board has dip switches so there must have been some documentation. I'll keep looking; perhaps it's in another box somewhere... The TOSIE board has some documentation (board layout, fix/mod instructions etc) but no schematics. There are some pics on my site but they are scaled for the web. I'll try to take some new photos for you.

Steve

[Steve Gray]

Hi All,

A note to let everyone know that my OSI C4P Web Page has moved. It is now located here:
http://www.6502.org/users/sjgray/comput ... index.html

I finally have more storage space and hope to expand the info/pictures/etc in the near future. If you have feedback or suggestions please email me directly.

Steve