I would guess
JP14 for the speaker.
JP15 keyboard switch/pwr led

There also seems to be corrosion next to the keyboard connector, where the battery once was...

weedeewee wrote on 2021-04-08, 21:25:

I would guess JP14 for the speaker. JP15 keyboard switch/pwr led […]
Show full quote

I would guess
JP14 for the speaker.
JP15 keyboard switch/pwr led

There also seems to be corrosion next to the keyboard connector, where the battery once was...

Yes, I thought this too but the speaker still doesn't beep. Also the corrosion was repaired with wire but without effect

Another alternative would then be a diagnostic card or EEPROM - with the latter, try the SuperSoft/Landmark Diagnostic ROM available on minuszerodegrees.net.
You will need an MDA or CGA card with the appropriate monitor to see what's being displayed (and of course a blank E(E) PROM and burner).

jesolo wrote on 2021-04-09, 09:20:

Another alternative would then be a diagnostic card or EEPROM - with the latter, try the SuperSoft/Landmark Diagnostic ROM available on minuszerodegrees.net.
You will need an MDA or CGA card with the appropriate monitor to see what's being displayed (and of course a blank E(E) PROM and burner).

When using the SuperSoft/Landmark diagnostic ROM I assume I need to download the 5170 version?

therevisiona wrote on 2021-04-09, 11:07:

jesolo wrote on 2021-04-09, 09:20:

Another alternative would then be a diagnostic card or EEPROM - with the latter, try the SuperSoft/Landmark Diagnostic ROM available on minuszerodegrees.net.
You will need an MDA or CGA card with the appropriate monitor to see what's being displayed (and of course a blank E(E) PROM and burner).

When using the SuperSoft/Landmark diagnostic ROM I assume I need to download the 5170 version?

Yes, that is correct - as I recall, there are odd and even versions and a combined one. Use the one appropriate to your board which, based on the pic provided, will be the former.
Do not attempt to reprogram your current EPROMs, but obtain two blank ones.

I need bios of this motherboard i have one similar but no bios can u dump please?

dataino.it wrote on 2021-04-09, 13:14:

I need bios of this motherboard i have one similar but no bios can u dump please?

Well that Is going to be a chore - this Is not a EPROM, and the numbers on the chip don't return anything when put into google

therevisiona wrote on 2021-04-09, 14:59:

dataino.it wrote on 2021-04-09, 13:14:

I need bios of this motherboard i have one similar but no bios can u dump please?

Well that Is going to be a chore - this Is not a EPROM, and the numbers on the chip don't return anything when put into google

just assume it's a standard PROM, instead of an EPROM or an EEPROM, if you got a reader like the minipro.

therevisiona wrote on 2021-04-09, 14:59:

dataino.it wrote on 2021-04-09, 13:14:

I need bios of this motherboard i have one similar but no bios can u dump please?

Well that Is going to be a chore - this Is not a EPROM, and the numbers on the chip don't return anything when put into google

You can try to dump the BIOS with Navrátil System Information (NSSI), but I can't remember how complete the image file will be, if your motherboard has an odd and even BIOS. It will most likely create one combined image which will then need to be split up again.

Well that would require the board to boot into DOS, wouldn't it?

Well once I get it going I will dump the bios for you

therevisiona wrote on 2021-04-09, 20:06:

Well once I get it going I will dump the bios for you

THX ,
split bios in two file is not a problem, there are a lot of programs that can do that (es winhex)

Re: Questions about Bios in low and high files

This board but is near exact to my Protek 286 board but slightly different layout. Same chipset, same support chips, same DIP and SIPP memory layout.
Will try to extract the two BIOS images this weekend.

Horun wrote on 2021-04-10, 01:00:

This board but is near exact to my Protek 286 board but slightly different layout. Same chipset, same support chips, same DIP and SIPP memory layout.
Will try to extract the two BIOS images this weekend.

What CPU clock does your motherboard use? My board has some markings on the back (P-286-16, not recognized by the internet), from which I assume the board used to have a 286-16 processor, but there is a 286-10 processor installed. Can this make the motherboard not boot up? Either way I'm not installing my known good 286 in fear of it being destroyed.

If the board is clocked for a 16MHz processor and a 10MHz one is installed, then yes, that could cause it to not boot.

It looks like you have a 48MHz crystal in the top right corner there - that's likely to be divided by 4 to give a 12MHz... although it could be using a divisor of 3 which could have been 16MHz.

Either way, 48MHz doesn't divide cleanly to give you a 10MHz processor clock - it's likely that it's running anywhere from 2 to 6MHz out of spec; which is a fair bit for a 10MHz cpu.

megatron-uk wrote on 2021-04-11, 18:36:

If the board is clocked for a 16MHz processor and a 10MHz one is installed, then yes, that could cause it to not boot.

It looks like you have a 48MHz crystal in the top right corner there - that's likely to be divided by 4 to give a 12MHz... although it could be using a divisor of 3 which could have been 16MHz.

Either way, 48MHz doesn't divide cleanly to give you a 10MHz processor clock - it's likely that it's running anywhere from 2 to 6MHz out of spec; which is a fair bit for a 10MHz cpu.

And what would happen if I put a 16 MHz CPU in there if it was clocked for a 12 MHz?

megatron-uk wrote on 2021-04-11, 18:36:

If the board is clocked for a 16MHz processor and a 10MHz one is installed, then yes, that could cause it to not boot.

It looks like you have a 48MHz crystal in the top right corner there - that's likely to be divided by 4 to give a 12MHz... although it could be using a divisor of 3 which could have been 16MHz.

Either way, 48MHz doesn't divide cleanly to give you a 10MHz processor clock - it's likely that it's running anywhere from 2 to 6MHz out of spec; which is a fair bit for a 10MHz cpu.

I will see the CLK pin on my oscilloscope and will document my findings. I already have a lot of three 286 processors on its way from the US (286-12, 286-16, 286-20).

therevisiona wrote on 2021-04-11, 19:12:

And what would happen if I put a 16 MHz CPU in there if it was clocked for a 12 MHz?

It would crash the gibson.

but seriously, No, it would just run at 12MHz.

And would it have some problems like unstability or would it run completely fine? My 16 MHz CPU is from Harris.