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romanon
February 20th, 2016, 12:43 AM
Hello, its just only mine machine, or lot of DOS software not work on IBM Convertible?
Actually, my PP06 Czechoslovakian XT clone is more IBM PC compatible than IBM PC 5140

Can someone who have IBM Convertible test following things?

I tested with PC-DOS v3.30 and MS-DOS v6.22

Checkit version 3.0 - NOT WORK
Checkit version 4.1 - NOT WORK
Checkit version 2.1 - work, system board test - DMA controller failed on channel 0


Also some XT games work, but some not.

Thanks.

Stone
February 20th, 2016, 03:28 AM
FWIW, CheckIt 3.0 does not run with 256K. Even on my XT with 256K, when I need to run CheckIt I have to add a 256K expansion RAM card in order for it to run. I don't know how much RAM your 5140 has but it comes with 256K.

romanon
February 20th, 2016, 04:43 AM
FWIW, CheckIt 3.0 does not run with 256K. Even on my XT with 256K, when I need to run CheckIt I have to add a 256K expansion RAM card in order for it to run. I don't know how much RAM your 5140 has but it comes with 256K.

I have 512k and Checkit 3.0 freeze after this screen

29682

Stone
February 20th, 2016, 04:50 AM
What about the DMA controller?

romanon
February 20th, 2016, 05:40 AM
What about the DMA controller?

My theory is - XT machines use DMA 0 channel only for refreshing dynamic RAMs...but 5140 have static RAMs, so maybe 5140 dont use channel 0...channel 1,2 and 3 is without errors

mbbrutman
February 20th, 2016, 06:50 AM
I have found the machine to be highly compatible.

Diagnostic software is always going to be a problem because it tests very specific behaviors. The 5140 video card can switch between CGA and MDA when the external CRT adapter is attached. The keyboard has less keys like a PCjr. The RAM is static. It has a sleep mode ... You get the idea.

romanon
February 22nd, 2016, 09:48 PM
Another interesting thing...
Floppy drive A: cant read/write fake 720k floppy disks (1,44MB drive with covered HD/DD hole and formated to 720k) but B: floppy drive can. How is this possible. Drives are totally the same...