#pc104 — Public Fediverse posts

Having failed to get my first version of the C011 #PC104 #transputer adapter to work, I've gone for a simpler approach.
This has just the Inmos C011, 5MHz oscillator, decoding logic (CPLD/74*245) and of course some LEDs.
I've added more this time which I hope will give me of an idea when something is working or not.
I've also brought in all 20 bits of the ISA address bus to the CPLD (not that I think I'll need it but just in case).
I've also used DIP chips in case I need change the speed.

NotLadp and NotSys are two addresses (0x150 and 0x160) and are asserted when the address matches.
PCLK is the ISA bus clock (14.3MHz on my #PC104 PC).

My logic here is that this is a 3 stage ripply counter.
When either address is invalid, the riple counter is reset (.ar = asynchronous reset).
So when an address is valid the IOCHRDY signal will be LOW, i.e. force a wait state.

Wohooo!!!
My #Transputer #pc104 adapter lives!!!
Turns out the CUPL code has two pins inverted (active low) that should not be inverted.

Same sequence of events on my pc104 PC controller by QBasic, I don’t get a response from the TRAM for first read :(
So something isn’t right with the PC timing or the CPLD.
#transputer #pc104

I’m getting nowhere with my #PC104 computer, basically it’s too fast for my needs (celeron at 1Ghz with 1Gb ram).
Does anyone have something sub 300Mhz in pc104 they would like to swap?

#PC104 #Transputer woes...
It seems I can write a value to the TRAM (a T425 based one) but when I try to read it back I get rubbish :(

This is my writing 0xAA55AA55 to address 0x8000FF00 (this is a valid address)

but when I read it back, I just get 0x10101010

Well the #PC104 #Tranputet link board is assembled. And it sort of works.
I can write to the link controller (0x150 base address) and I can send and read data through the link ports for the transputer. But (you knew it was coming right?) when I try and read the status from the control logic I get the wrong values, even though I can reset the TRAM and set the analyse signal.
So I’m a bit baffled.

Quick fit check of the big parts, everything fits.
I got lucky with one SMD part that if it had been slightly higher on the board it would have clashed with a part on the underside of the TRAM but I did have high 8pin headers just in case.
#Transputet #PC104

They’re here…
#PC104 #Transputer

Hooked up a display to my #PC104 computer and did a quick qbasic program and yup it works.
I need to do proper address decoding next.
That’s what the CPLD is for.

And finally the dual #Transputer TRAM #PC104 board is done

Going to let them sit for a couple of days in my head, and then order PCBs.

And of course, my #PC104 #Transputer link card had to be updated :)

#RetroComputing

The #PC104 version of #PicoGUS works and is sounding just amazing!!
Thank you to @polpo for his work and efforts that made porting his ISA card to PC104 such a doddle
#PC104GUS #retrocomputing #retrogaming

A while back I bought a couple of #pc104 power supplies, one is just pc104+ and one is pci104.
So I figured what the heck and went for the flashy one first and yup it lights up, connecting it to my pc104 computer it does indeed boot. But I did need to remove the previous battery clip and put in a lower profile one.
The flashy one is rated for 188W which is insanity in this form factor. But it will be handy when I start adding cards and transputers to the stack.
#retrocomputing

I designed a PC104+ breakout board.
I'll be using this for various experiments and tests, almost certain around transputers.
#PC104 #Transputer #RetroComputing

Oh, here is a better picture of my pc104+ computer. Kinda cute eh?

Depending on how well my pc104gus card works I may do more cards. I have ideas.

#PC104 #retrocomputing

Are there #monitors #displays our there that do this (see image) nicely i.e. have mounts and/or compartments with power for one or more #miniPC or #raspberrypi pi #formfactor #singleboardcomputers #SBC on rear of #monitor and feed #ports to a built-in / attachable #hub #dock #dockingstation #KVMswitch ?

#miniitx #pc104 #femtoitx #picoitx #raspberrypi #MiniPCs #vega #vesa

@furan
I think I read about PC104 in popular #electronics like 30 years ago. And in the last 20 years, I read about #arduino and SBCs. what made you decide to use #PC104 ?

#EEVblog #1028 - What's All This PC/104 Stuff Anyhow?

https://www.youtube.com/watch?v=6ad0KP5EvpU

#PC104 #embedded