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geekhack Community => Keyboards => Topic started by: majkee on Tue, 30 March 2021, 04:09:29
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Hi everyone. I've get an old keyboard without cable, originally with DIN5. Now i'm going to set a new one but befoire i'll do it i need to be sure with pinout's.
The keyboard has DMC80C49-081A inside. I need to recognize cables.
Wiring is on the pic below.
Thanx 4 help.
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do you have any photos of the PCB?
if you have as long as the power is the right way around there should not be any damage swapping clock and data, so if you find the place the old cable was plugged into and retrace the pins from there it is just a 50-50 trial and error, either it works from the get go or you swap data and clock and it works then. as long as you got power right that is, and if the keyboard still works.
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Here's what I get with multimeter. Weird...
On the board:
1 - INT (pin 6)
2 - T1 & P27 (pins 39 & 38)
3 - it's shield on both sides
4 - GND
5 - +5V
In attachment is description of two pins. I guess one of them is data and one is clock. What do You think?
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int can be disabled, so it may mean nothing, shield and GND can be tied or you connect the shields to your new cable shield, rather non critical, here for FCC compliance.
to be honest i would expect T1 to be clock and INT to be data with interrupts disabled but i may be wrong.
and when i asked for a pcb pick i was kinda hopping the trace to be visible :) forgot it was an old rubber dome.
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Thank You for Your answer.
Today I'm going to finish my work and in next week I will do the test :) If it's going to work I'll take care with next ones :)
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none of them have cables?
not all of them will use the same pin-outs though, same tracing work will be needed for each
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Unfortunately all of them have cutted cables. I've save them from garbage. I guess all are rubber done.
And as You said, every of them need to be treated individually.
In Saturday i will prepare one worthless CPU for test :)
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well often BTC domes are considered 2nd only to topre so not too bad, can't talk from experience though.
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This one with full success ;) This time Dytcom K-161