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Re: Sporniket's log on hardware stuff
Posted: 17 Feb 2023 01:40
by Darklord
That is Bruce from B&C Computervisions.
I've bought several things from him in the past and it's almost
always been a good experience.
For some reason, in my poor addled brain, I was thinking the
TeamTap was rare.
I might be confusing it with ICD's Catbox or something.
Who knows - too many Atari memories bouncing around in my
head, competing for notice? :roll:
Re: Sporniket's log on hardware stuff
Posted: 17 Feb 2023 01:41
by Darklord
Wow. I even found -1- on Amazon. :)
https://www.amazon.com/Atari-Jaguar-Team-Tap/dp/B000YBERNQ
Oh forgot... Guess we can't post Amazon links?
Re: Sporniket's log on hardware stuff
Posted: 03 Apr 2023 21:24
by sporniket
Just after getting my refund for the Atari 520ST, I could not help buying this tattered mega st, for not too much. Now I have to postpone trying getting my hand on a 520ST (or just a motherboard), but I am ready for when I will want to convert the schematics of the Mega ST, likely in two years :D (because, I plan finish the 520ST this year, then do the STF next year)
2023-04-03--00-mega-st-overview.jpg
2023-04-03--01-scratched.jpg
2023-04-03--02-burned.jpg
Re: Sporniket's log on hardware stuff
Posted: 04 Apr 2023 16:17
by Darklord
The Mega's are great machines. It's a Mega ST4 (with lots of upgrades) that I use to
run my BBS.
You'll have lots of fun rehabilitating that machine. :)
Re: Sporniket's log on hardware stuff
Posted: 15 Apr 2023 10:12
by sporniket
I got some time that I allocated to get some progress on my 520ST schematic conversion, so I went on with the CPU and the reset circuit. The wiring of the resistor networks was a PITA (sometimes I see a pin #10 on a 9-pins resistor network).
So this is a provisional work until I can check on real hardware. And I will move on with the schematics and do the PCB afterwards when all is done, as alternating between both turned out less efficient as I believed at first.
subsheet_105--U36-37-Reset-circuit.png
Re: Sporniket's log on hardware stuff
Posted: 18 Apr 2023 19:47
by sporniket
Starting to convert the last sheet, starting with the MFP and the serial port. It was done quite quickly, and the whole fit on one A4 sheet.
subsheet_100-U11–68901 ; U13–14 J4–RS-232 port.png
Re: Sporniket's log on hardware stuff
Posted: 19 Apr 2023 19:41
by sporniket
Today a first ACIA with the keyboard and joystick/mouse ports. By the way, please enlighten me, what is the "keyway" ???
subsheet_101_U21-Acia ; J10-11-12-Joystick, mouse, keyboard ports.png
Re: Sporniket's log on hardware stuff
Posted: 19 Apr 2023 19:56
by exxos
Keyway pin 2 ?
Capture.PNG
Re: Sporniket's log on hardware stuff
Posted: 19 Apr 2023 20:30
by sporniket
Yes I am not sure.
Why name an unconnected pin, and on the other hand, the latest wire to pin 17 (that goes through all the other wire) is unnamed ?
I have the answer, on the schematic of the keyboard
Capture d’écran du 2023-04-19 21-26-17.png
And then I have the "Eureka" moment : it must be the polarisation of the connector, to not plug it in the wrong orientation ?
Re: Sporniket's log on hardware stuff
Posted: 19 Apr 2023 20:35
by exxos
sporniket wrote: 19 Apr 2023 20:30
And then I have the "Eureka" moment : it must be the polarisation of the connector, to not plug it in the wrong orientation ?
Yep. "Missing pin" basically. Atari just called it "KEYWAY" or "KEY" it seems.
If you look at one of the motherboards...
IMG_3359.JPG
... You can see the missing pin.