Search found 17 matches

by Scott Larson
Sun Nov 06, 2016 12:57 am
Forum: OSI discussion, thoughts, projects
Topic: OSI 560Z Clone?
Replies: 23
Views: 17162

Re: OSI 560Z Clone?

Can you still get that Intersil chip?

If I remember correctly OSI used a 6502 in some freaky way to intercept the DMA so the chip thought it was talking to DEC peripherals so you'd need this software if it ever existed.

And the PDP-8? Ugh!
by Scott Larson
Thu Jun 11, 2015 9:29 pm
Forum: Introductions and Reminiscence
Topic: New member original super board II owner
Replies: 6
Views: 3456

Re: New member original super board II owner

After looking around, I'm pretty sure I used the MOS 6526 for an RTC. I remember I used the same chip for a parallel printer interface (replacing my crude 8 bit latch circuit) and a second serial port for a modem. The 6526 provides both of those. It also stores the time and date in BCD format. Kind ...
by Scott Larson
Wed Jun 10, 2015 11:52 pm
Forum: OSI discussion, thoughts, projects
Topic: Superboard mods
Replies: 23
Views: 10750

Re: Superboard mods

@Dave: Here are the scans of the Progressive Computing C1P Video mods. Feel free to host them. http://www.jeffferguson.ca/OSI/ProgressiveComputingVideoMod/C1P%20Video%20Mods.PDF http://www.jeffferguson.ca/OSI/ProgressiveComputingVideoMod/Video%20Mod%2032.PDF http://www.jeffferguson.ca/OSI/Progressi...
by Scott Larson
Wed Jun 10, 2015 11:45 pm
Forum: Introductions and Reminiscence
Topic: New member original super board II owner
Replies: 6
Views: 3456

Re: New member original super board II owner

MK14HAK wrote:Scott, do you remember the RTC chip you used ?
No, I don't remember.
by Scott Larson
Wed May 13, 2015 5:22 pm
Forum: Introductions and Reminiscence
Topic: New member original super board II owner
Replies: 6
Views: 3456

Re: New member original super board II owner

also wrote a very small program that uses the vertical sync signal to generate an interrupt which runs a little clock like routine that keeps time by actually doing the addition on the ASCII characters stored in the corner of the video screen. One of the exciting projects I did was build a real tim...
by Scott Larson
Wed May 13, 2015 5:12 pm
Forum: OSI discussion, thoughts, projects
Topic: Superboard mods
Replies: 23
Views: 10750

Re: Superboard mods

I think I got mine from Progressive Computing since reading the name made my heart skip a beat. That was the first major hardware project I had ever done. I was ten years old and it was on the edge of my skills. After making many mistakes which forced me to understand how it worked, I had learned a ...
by Scott Larson
Tue Mar 03, 2015 12:48 am
Forum: OSI discussion, thoughts, projects
Topic: Superboard mods
Replies: 23
Views: 10750

Re: Superboard mods

All I have are nightmares of piggy-backed chips.

That was the first major hardware project I ever did. I was about 12 years old. I learned everything about how video worked because that was the only way I could figure out how I screwed it up.
by Scott Larson
Tue Mar 03, 2015 12:42 am
Forum: OSI discussion, thoughts, projects
Topic: CXP board
Replies: 9
Views: 152074

Re: CXP board

WOW, I had totally forgotten about that board. Yes I designed the CXP a VERY long time ago. Good to hear I'm not the only one who forgot about the CxP. I can't for the life of me remember what I was using it for. I don't remember owning any OSI video boards so apparently I was using my C1P as a ter...
by Scott Larson
Mon Nov 24, 2014 8:31 pm
Forum: OSI discussion, thoughts, projects
Topic: CXP board
Replies: 9
Views: 152074

Re: CXP board

The CxP article was in the January/February 1987 issue of Peek 65. I appear to have the C8P chassis and there are two power supplies like I see in the images so I guess these were separate floppy and backplane power supplies. For some reason my dual 8 inch drives are in yet another cabinet (not OSI)...
by Scott Larson
Thu Nov 13, 2014 4:00 am
Forum: OSI discussion, thoughts, projects
Topic: CXP board
Replies: 9
Views: 152074

Re: CXP board

Here they are: http://www.wballphotos.com/CxP_Front.jpg http://www.wballphotos.com/CxP_Back.jpg I have no idea what various mods I did to it. I'm guessing the stuff around the EPROM was to fit a smaller chip into a socket that probably wanted a larger more expensive chip. Even more odd, two of the p...