General > General Technical Chat
Does anyone recognise this logo? DD?
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TomS_:

--- Quote from: GlennSprigg on December 04, 2020, 12:03:51 pm ---I TRIED!!  (but failed..)

--- End quote ---

You sort of beat me to it. I was going to try this, but given I couldnt really find anything to begin with I didnt fancy my chances - as you found out.

Strange that even though they are still an active company, google knows nothing about them!

Probably they will now though.  ;D
TomS_:

--- Quote from: Labrat101 on December 03, 2020, 03:49:19 pm ---Do a close up of the bottom of the card as well .
 Some times it can be helpful  :-+

--- End quote ---

There really is nothing on the back to help, just the model number of the card! :)

edit: srsly wtf eevblog. A tiny bit of skin from my hand and my image "fails security checks"??
TomS_:

--- Quote from: CJay on December 04, 2020, 02:05:26 pm ---Now I need to know if they've got schematics available :)

--- End quote ---

Ive sent them an email to ask for datasheets/schematics if they have them. Lets see how I get on.  :-+
CJay:
TBF, there's very little to it,

32 identical looking Opto isolated ports with some simple protection, connected to the PIO chips, buffered 8 bit databus via the LS245,, some address/select decoding via PAL/GAL IC4 and that's about all she wrote, it's a nice exercise to reverse it and if you've a retro habit then it'd make a nice IO card for a homebrew computer, the DIN connectors are still available...

TomS_:
Yeah. Im doing a lot of retro type stuff lately, which is largely the reason why I picked these up.

It has all been reasonably predictable given that Ive studied the PRO-LOG datasheets for similar cards a bit. Actually Im more interested to see how close I got with the control signals themselves, because the rest of the circuitry Ive been able to figure out quite easily. Ive made some educated guesses based on what I observed while playing with the PAL and knowing how the Z80 toggles its signals, if I had the schematic for one of the boards that would at least let me know if I got them right.

I probably cant do much with the cards themselves, the bus is non standard, or I would have to build everything to match this bus, but there are parts I could play with. Its more of a distraction than anything else. 2020 doesnt really deserve much attention. :-DD
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