This looks like a pretty well laid out 286 board. I am not totally familiar wit the NEAT chipset, but according to the manual it is designed for 12 and 16MHz.

http://www.datasheetarchive.com/dl/Scans-003/ … ans-0076925.pdf

The 16MHz is also stamped into the ICs, and they are socketted. To me this is a warning not to exceed 16MHz. The reason the chipset is socketted is so the chips can be replaced if they fail...which they sometimes did, because early VLSI technology wasn't advanced at that time. I would guess operation at 20 or 25MHz could risk damaging your chips.

Also, according to the manual 8mb is the max for onboard memory. I highly doubt it will support 4MB chips. You will have to get 1MB SIPPS (or SIMMs in an adapter), and combine them with higher density DRAM ICs. You can get to 16MB using ISA memory expansion, but that will likely not run at full system speed (unless you run ISA at 16MHz, which I also don't recommend).

For the system you are thinking of, you might have better luck with a board based on the Headland HT12 chipset or possibly C&T "SCAT".

Anonymous Coward wrote:

This looks like a pretty well laid out 286 board. I am not totally familiar wit the NEAT chipset, but according to the manual it […]
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This looks like a pretty well laid out 286 board. I am not totally familiar wit the NEAT chipset, but according to the manual it is designed for 12 and 16MHz.

http://www.datasheetarchive.com/dl/Scans-003/ … ans-0076925.pdf

The 16MHz is also stamped into the ICs, and they are socketted. To me this is a warning not to exceed 16MHz. The reason the chipset is socketted is so the chips can be replaced if they fail...which they sometimes did, because early VLSI technology wasn't advanced at that time. I would guess operation at 20 or 25MHz could risk damaging your chips.

Also, according to the manual 8mb is the max for onboard memory. I highly doubt it will support 4MB chips. You will have to get 1MB SIPPS (or SIMMs in an adapter), and combine them with higher density DRAM ICs. You can get to 16MB using ISA memory expansion, but that will likely not run at full system speed (unless you run ISA at 16MHz, which I also don't recommend).

For the system you are thinking of, you might have better luck with a board based on the Headland HT12 chipset or possibly C&T "SCAT".

Thanks for the information!

I will have to use my PC Chips M209 for some 25 MHz 286 adventures it seems. It has a PLCC socket so its easier anyway but the M209 only supports 4MB onboard memory.

Installing sockets for the oscillators would still be nice though as it would alow me to slow down the system more for running early 80s games. I will still try 4MB SIMMs just in case the board will accept two of them or see half the size otherwise I will get another 24* high density DIPs together with 4x1MB SIMMs so I can max it out at 8MB.

*I already have 8 from the M209 PC Chips board which now runs 4x1MB 30pin SIMMs in the SIPP slots using SIMM sockets.

hello today i have found same board, i have just found it is PROWTEC PA-5000 and it was mounted in LogoStar personal computer, model no: 286/16,
my board has faulty battery, i have just replaced it with battery CR2032 socket on long legs 😀 i have complete workstation but it is not running, serial port card was burned out, i have found faulty 10uF/16V capacitors in short circuit, i have replaced them, now im trying to repair this board and any help, jumper settings or anything can help me

I can not find a "PROWTEC PA-5000" to look at.
Do you have more information?
Another name for it?
The BIOS string might help if you have one.
.

good news everyone,
i have fixed motherboard without any datasheet, manual etc.
-bad two tantal capacitors on 12V and -12V lines
-bad battery
then board starts booting but with BEEEEEEEEEEEEEEEEEEP beep BEEEEEEEEEEEEEEEEEEEEP beep code,

it was just bad 74ALS245AN on the edge of board, i replaced it and board starts working normally 😀

i have additional info about workstation manufacturer:
LogoStar
Mariahilfer Strasse 47/5
A-1060 Wien
(company doesnt exist anymore)
board is:
PROWTEC PA-5000
BIOS:
Phoenix 80286 ROM BIOS PLUS Verison 3.10 22
in bios:
Phoenix Technologies Ltd.
System Configuration Setup V4.02.1

i didnt found any bios standard tag, identification, nothing ...

i have changed RLL/MFM controller because it is faulty and after hours of trying another controllers i have used ide RAID CARD.
my hardware configuration:
-8bit ISA COM+LPT ports card, originally with workstation, fixed faulty tantal
-8bit ISA CT1350 sound blaster
-8/16bit ISA TRIDENT TVGA9000C (i need vga output, i also have original paradise EGA)
-8/16bit ISA TULIP AMD PCNET NCC-16 - changed to 3com etherlink III (better compatibility)
-8/16it ISA IDE RAID CARD TEKRAM with 4x SIMM 30PIN CACHE 4MB
-FLASH IDE drive 128MB
-3.5 and 5.25 floppy
-512kb RAM

what i plan for the future:
-add 287 koprocessor, if i get it somewhere for cheap price
-add 4x 30pin simm slot ram adapter into original pin- legs on board and 4x 1M simm ram module or 2MB or 4MB - i must try if board can handle so much

aditional info:
-do not overclock cpu, cpu and chipset are not suitable to run faster (20MHz etc.)

Good job!

thanks 😉

i have here one aditional quest:
originally there was 3.5 floppy connected on MFM/RLL controller
TEAC FD-235HF 218-U
p.no: 19307322-18
and it doesnt work on today IDE controller, i think there is 6 rows 2 pins jumper field with descriptions:
H HO
OP
LHI
HHI
D1
D0
and FG is soldered jumper on board.
for RLL is OP and D1 jumper populated, i dont know if it is also correct for IDE controller 🙁 when i try to find this teac model, everywhere is 3x6 jumper field 🙁

-added 4 simm 30pin slots, added 4x1MB simm ram and it works 😀
i have also tried 30pin 4MB modules, but MB recognizes max 1MB per slot ...
-fixed problem with basic memory, 640KB
-dumped bios, fixed memory management problem, burned back, now 640base memory, 360k reserved for high memory + simm modules are recognized, previously only 640KB and simm modules or 640 +360 when memory remaping 640-1M was enabled in bios and 640+4x1MBsimm when disabled

I have same 286 Board here, but it has PA-2040 and PA-5000 on pcb. Which PA-5000 is overpainted with marker.

My PROWTEC PA-2040 is very fast (20Mhz and zero waitstate for DRAM, Landmark-benchmark tell me: i have 27Mhz AT )