I would also open and inspect the power supply, imagine how much dust is in there not to mention check capacitors and output, don't want to burn up that nice board with a powrsupply that may be out of spec now

The post has been successful, obviously the errors are due to the fact that I removed the old battery

pressed the F1 key to enter the basic rom..............

the video card I found installed is a hercules

but not having the monitor, I had to install an old et3000 8bit

treeman wrote:

I would also open and inspect the power supply, imagine how much dust is in there not to mention check capacitors and output, don't want to burn up that nice board with a powrsupply that may be out of spec now

The power supply that I used for this test I had completely overhauled last month 😊

I recently picked up one of these on fleabay but still haven't had time to play with it. It's scattered about the house in a dozen different pieces. I think I heard somewhere that early IBM CGA cards won't work with ATs because they can't handle the increased CPU speed?

If works a crappy hercules, I don't see why a CGA even if it's an early model won't work.........

I will clean the filthy "M" keyboard when I have finished to test everything and putting back into the case

removed the dust from the serial/parallel card and tested it

the floppy/MFM controller cleaned up

while I was waiting for the motherboard was drying, I connected a motherboard 386 that I just finished fixing to test the type 2 HDD brick

incredibly, the disk motor started spinning without hesitation, passed the bios test and booted as if nothing had happened

DOS 5....... too recent for this pc 🤣

now some serious tests

and this too has passed without errors

now the most comprehensive test

completed after 5 hours........

no bad sectors......... incredible !!!!! 😲

thats pretty amazing! very nice

Rasna wrote:

If works a crappy hercules, I don't see why a CGA even if it's an early model won't work.........

not necessarily, I recently attempted to use an original IBM CGA card in my 286 build and it flipped out. It sort of worked, but it got hotter than I was comfortable with and it also didn't behave with some programs.

[SOLVED] DOS programs refuse to use CGA graphics modes

Ohhhhhh I've been looking for a 5162 for months :p
GL with the resto.

Errius wrote:

I think I heard somewhere that early IBM CGA cards won't work with ATs because they can't handle the increased CPU speed?

I don't think that's true.
What is true is that CGA cards do not have an onboard crystal, so they rely on the OSC signal from the ISA bus, which should generate a proper 14.32 MHz NTSC clock.
Some AT clones might not generate the proper clock, which would cause sync problems between the CGA card and the monitor. But I would expect the original IBMs to work properly. In fact, I believe CGA was even one of the video options that the 5162 and 5170 were sold with.

One thing I notice with this computer, in factory configuration, is severe crowding of the I/O card, drive cables and drive controller card. So much so that the drive controller card is physically warped. Bent in an arc. (It's not just my machine, googling images of other units on the internet shows that this deformation is common.)