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Posted: 29 May 2018, 22:38
by ibmapc
Here's my version of Engicoder's XT2PS2 Keyboard Converter built on a perfboard and attached to my IBM 5155 that's been upgraded with a 286 motherboard. Works GREAT!
Notice that the board needs to be tucked under the keyboard pc board due to the 5155's keyboard enclosure.
Thank you Engicoder for the design and firmware!

Bottom of xt2ps2/wires.
Spoiler:
Bottom of xt2ps2/wires.
Bottom of xt2ps2/wires.
IMGA0054.jpg (1.06 MiB) Viewed 403 times
Top of xt2ps2.
Spoiler:
Top of xt2ps2.
Top of xt2ps2.
IMGA0055.jpg (877.04 KiB) Viewed 403 times
Top side of keyboard with xt2ps2 connected.
(turned out to show off xt2ps2 and connectors.)
Spoiler:
Top side of keyboard with xt2ps2 connected.<br />(turned out to show off xt2ps2 and connectors.)
Top side of keyboard with xt2ps2 connected.
(turned out to show off xt2ps2 and connectors.)
IMGA0056.jpg (1.02 MiB) Viewed 403 times
Under side of keyboard with xt2ps2 attached.
Spoiler:
Under side of keyboard with xt2ps2 attached.
Under side of keyboard with xt2ps2 attached.
IMGA0056a.jpg (927.08 KiB) Viewed 403 times
Part way into the enclosure.
Spoiler:
Part way into the enclosure.
Part way into the enclosure.
IMGA0057.jpg (844.79 KiB) Viewed 403 times
The keyboard in place.
Spoiler:
The keyboard in place.
The keyboard in place.
IMGA0058.jpg (922.32 KiB) Viewed 403 times
All closed up.
Spoiler:
All closed up.
All closed up.
IMGA0059.jpg (1.12 MiB) Viewed 403 times

Posted: 02 Jun 2018, 19:55
by ibmapc
Here's rev 2.0 of my version of Engicoder's XT2PS2 Keyboard Converter built on a breadboard. I must admit the first version was rushed a bit. I just looked at the schematic, placed some parts on the board and started connecting wires. It wasn't 'till near the end that I figured out that I had misread the schematic and the attiny was placed backwards so in the new version I laid it out on paper before proceeding and was able to make it much tidier. There are no crossed wires. Can you find the decoupling cap? Please ignore the flux left behind. I used rosin core solder so it shouldn't hurt anything. It can be a little tough to remove though and I don't want to knock any wires out of wack scrubbing with a toothbrush and isopropanol.
IMGA0068.jpg
IMGA0068.jpg (1.14 MiB) Viewed 315 times
IMGA0064.jpg
IMGA0064.jpg (1.05 MiB) Viewed 315 times

Re: XT to PS/2 Converter for Model F

Posted: 06 Jul 2019, 19:22
by Octal
Sorry for necro posting. Has there been any updates to this project since this thread? I'm trying to build my own; does any one photos of this adapter on a bread board, I'm not that great at reading circuit diagrams.