Posted By
Retroshire
on 2024-01-06
11:22:19
|  C116 finding A14/A15 on PCB
For expanding the C116 I am looking for A14/A15 on the PCB. On C16 no problem, on C116 any suggestion?
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Posted By
gerliczer
on 2024-01-06
11:59:11
| Re: C116 finding A14/A15 on PCB
Have you tried to check it on the C116 schematics? Or the CPU pinout?
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Posted By
Retroshire
on 2024-01-06
12:39:56
| Re: C116 finding A14/A15 on PCB
Sure. I don't want to solder direct on CPU, TED or PLA. I examined the traces on PCB. With little usable result.
A14 is I already found. Near the PLA there is a possibility to put a header pin in a empty hole, on the top side of the PCB.
I really like to find the same option for A15.
But I suppose there is experience with expanding C116 to 64kb. So my question: wich solutions are already found?
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Posted By
SukkoPera
on 2024-01-06
13:00:22
| Re: C116 finding A14/A15 on PCB
Just use a multimeter in continuity mode, put one end on pin 21 of the CPU and poke around randomly with the other until it beeps. Repeat with pin 22 for A15.
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Posted By
Retroshire
on 2024-01-06
13:22:52
| Re: C116 finding A14/A15 on PCB
@SukkoPera that is exactly what I have been doing. A lot of poking around, no results.
With the C16 this is easy, next to the modulator are contacts for A14/A15.
I am talking about the C116, not so easy.
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Posted By
SukkoPera
on 2024-01-06
13:46:29
| Re: C116 finding A14/A15 on PCB
I know, on the C16 one could also just open the LittleSixteen V2 KiCad project, as it is 1:1 with an original board, and instantly get to know all the A14 and A15 points:
Unfortunately I have never worked on a C116 though, that's why I suggested a DIY method, it shouldn't take too long but I guess I'm wrong :/.
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Posted By
Patrick
on 2024-01-07
03:59:30
| Re: C116 finding A14/A15 on PCB
i can make a photo of my c116 with 64K, if that will help you?
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Posted By
Retroshire
on 2024-01-08
11:48:07
| Re: C116 finding A14/A15 on PCB
That would be helpfull! Thanks!
Already found an alternative, connected the wire to the PLA A15. Working fine, 64kb.
I don't think there is a VIA for A15, though I used the VIA below the PLA for A14.
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