Recent content by fdiskitup

big red LED kinda reminds me of something ....

Long live the CORTEX ! with alot of help from Stuart I made a mini CORTEX. the logo font is "CANE NORMAL" if you want to make decals for your CORTEX

very nice - I like the upcycling of a Walmart box ! do you see any issue with the 3 power supply's starting up simultaneously - I'm guessing they don't all stabilize at the same time ? would it be a bad thing to feed +15V/12V to the CPU before there is +7.5/5V ?

for future S100 Wannabees like me:- the JAIR (Joint Altair(Joshs') IMSAI Board) board gets you a fully working single board S100 computer to get started with. Now to test that IMSAI CPU board that started this thread...

Next time you are over by this way check out "Chester Electronics in Kenosha, WI" - it's a real electronics shop with shelves and loads of LS logic, and real people who will go into the back storeroom and come back with hard to find components. However the one thing they did not have was the...

it was great to meet you at VCF, how many of these rev 1.0 boards are out in the wild now ? have you tried swooping this out in the existing board ? - I'm at the shopping BOM stage - lots of 4116 ram chips on order from Aliexpress...

I found the parts from a company "New Strength Electronic Co., Ltd. Despite some bad reports on the web, they seem legitimate. They were actually pretty helpful and for $6 per unit + $10 shipping not too bad. link to supplier site but also email directly for tricky parts. Hope someone else...

Possible my fundamental understanding is poor, but can I use an active TTL delay line to replace a passive analog delay line?

I am going mad trying to find a source for 2 passive delay line modules - this type of thing, looks like a logic chip, but is not. These are part of a S100 RAM card and they are linked to the memory timing. The bill of materials lists : 9825 possibly made by “Pulse”. Which I think is a...

Well, I need do some more Assembly programing like how to write a "hello world" program, for the 6809 system. But I should really be able to work that out on my own. needs a loop until it hits "04" (not sure why 04 is used at the end of an ASCII message string ?) Then it's back to trying...

Thats perfect for this project, eprom and serial ! Thanks for pointing it out.

And dont think that this isnt like catnip for me .. $900. I’d have to sell a kidney.

This might be quite a long term project, but it keeps me out of the pub. Ive got a couple of SS-50c machines working with serial links, this has been great fun. I’m right at the beginning of the S100 learning. Maybe the ultimate goal is to get a monitor and minibasic up and going… perhaps a...

Thankyou for the link. There is some gold in there about memory cards and interface serial ports. I couldnt resist this imsai 16k memory card on ebay, it also needs some chips and some care …. You can probably guess where this is going …. Cpu, memory, backplane… did the 8080 machines use...

it kind of works (screenshot is with A=B mod), but perhaps windows10 and chrome are not the best combination for this.