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Suntac 80286 Mainboards

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Reply 140 of 164, by Predator99

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Next ones are 2 board from this lot:
Bought these (retro) hardware today

1st one is labeled "BAY 1000C" and comes with a Phoenix BIOS dated 04/20/88. I received it with the wire-fix, but it has still problems with the power supply and does not work. Maybe an easy fix.

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286-SUNTAC SA073155 IC23.rar
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286-SUNTAC BAY-1000C-.jpg
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The other one works perfectly and as far as I remember it looks exactly like the board that was installed in my 1st PC I worked so many years with:

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286-SUNTAC BAY-1000C-IC23.rar
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286-SUNTAC SA073155.jpg
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286-SUNTAC SA073155b.JPG
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Reply 141 of 164, by Predator99

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Next 6 Suntac boards from this lot 😀
Re: Bought these (retro) hardware today

Already tested 3 and they are running 😀
4 of the boards share the same BIOS "AWARD 3.03 01".

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SUNTAC Award 3.03 01.RAR
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SUNTAC Award 3.03 01-A.JPG
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SUNTAC Award 3.03 01-B.JPG
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Reply 142 of 164, by Predator99

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SUNTAC_2019-09-A.jpg
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SUNTAC_2019-09-C.jpg
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SUNTAC_2019-09-D.jpg
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Reply 143 of 164, by Predator99

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This one has BIOS "Award 0N3.03 NFS" with a "DISK STEP RATE" option. This is new to me, related to the floppy..?

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SUNTAC Award 0N3.03 NFS-A.JPG
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SUNTAC Award 0N3.03 NFS-B.JPG
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Reply 145 of 164, by dorkbert

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This looks like it is also laid out for 386sx. Stason indicates this is an Easy Data board.
Same board layout appeared under both 286 and 386 listing, with different "factory jumpers".
(I wonder if I can solder 386sx onto it and switch between 286 and 386sx)

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Reply 146 of 164, by suntac

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dorkbert wrote:
This looks like it is also laid out for 386sx. Stason indicates this is an Easy Data board. Same board layout appeared under bot […]
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This looks like it is also laid out for 386sx. Stason indicates this is an Easy Data board.
Same board layout appeared under both 286 and 386 listing, with different "factory jumpers".
(I wonder if I can solder 386sx onto it and switch between 286 and 386sx)

s-l1600.jpg

No, you can't. It's designed to be either a 286 or a 386SX.

Reply 147 of 164, by Predator99

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Next one from my Profex PC 33
Profex "PC 33" - Suntac 80286-12

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(NSSI dump)

Reply 149 of 164, by Predator99

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Got another board which I spotted in a scrap lot. Only little part was visible on the bad seller photo. This is what I got.

IMG_9426r.jpg
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It seems to be exactly the same one as this:
Re: Suntac 80286 Mainboards

Battery damage is severe, but after cleaning it does not look that bad anymore. No surprise its not working (Reset is on all the time), but at least I got a CPU and some RAMs...

IMG_9428r.jpg
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Reply 150 of 164, by Anonymous Coward

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dorkbert wrote on 2019-10-20, 12:58:
This looks like it is also laid out for 386sx. Stason indicates this is an Easy Data board. Same board layout appeared under bot […]
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This looks like it is also laid out for 386sx. Stason indicates this is an Easy Data board.
Same board layout appeared under both 286 and 386 listing, with different "factory jumpers".
(I wonder if I can solder 386sx onto it and switch between 286 and 386sx)

s-l1600.jpg

I know I'm a little late to the party, but this board is pretty cool for a 286. It has a fairly well integrated chipset, but the board is still full length. PCB quality looks to be excellent. It has a Dallas clock chip, which probably saved the board from being eaten by battery acid. It has 8 SIMM slots, which is fairly rare on a 286. They usually have 4, if they have any at all.
As you've pointed out, this board can also be equipped for 386SX, which means at minimum this board will probably work at 20MHz reliably...so if you want to experiment with fast 286 CPUs, this board seems like a good candidate. I wonder if the 387 socket can be used with an 80286 in place.
...and something unusual is that the board uses square oscillators rather than rectangular ones.

What did you end up doing with this one?

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 151 of 164, by Robin4

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Does one of these biosses have a User type 47 set by user manually?

Dont like that the type 47 is set fixed already.. I know it was normal back in the day.. But now days its to limited on the harddrive space.
I know i can use XT IDE card or such.. But iam hope more in finding a more advanced bios for it.. Brand it doesnt matter.

~ At least it can do black and white~

Reply 152 of 164, by dorkbert

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Anonymous Coward wrote on 2020-06-11, 00:28:

As you've pointed out, this board can also be equipped for 386SX, which means at minimum this board will probably work at 20MHz reliably...so if you want to experiment with fast 286 CPUs, this board seems like a good candidate. I wonder if the 387 socket can be used with an 80286 in place.
...and something unusual is that the board uses square oscillators rather than rectangular ones.

What did you end up doing with this one?

I think this board tops out at 16MHz on the 386sx side. Not too keen on clocking it at 20MHz, since the processor clock to peripheral bus clock is locked (strapping option?) and 20MHz clock will probably cause them to fail. The board is currently sitting in a box. I pulled the Dallas clock but hasn't gotten around to fitting a coin battery holder to it yet.

Reply 153 of 164, by Predator99

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Robin4 wrote on 2020-12-24, 02:51:

Does one of these biosses have a User type 47 set by user manually?

Dont like that the type 47 is set fixed already.. I know it was normal back in the day.. But now days its to limited on the harddrive space.
I know i can use XT IDE card or such.. But iam hope more in finding a more advanced bios for it.. Brand it doesnt matter.

You could try the MRBIOS
Re: How about a MR-BIOS ROM file repository?

Reply 155 of 164, by Robin4

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Predator99 wrote on 2019-08-03, 07:29:
Next ones are 2 board from this lot: Bought these (retro) hardware today […]
Show full quote

Next ones are 2 board from this lot:
Bought these (retro) hardware today

1st one is labeled "BAY 1000C" and comes with a Phoenix BIOS dated 04/20/88. I received it with the wire-fix, but it has still problems with the power supply and does not work. Maybe an easy fix.
286-SUNTAC SA073155 IC23.rar
286-SUNTAC BAY-1000C-.jpg

The other one works perfectly and as far as I remember it looks exactly like the board that was installed in my 1st PC I worked so many years with:
286-SUNTAC BAY-1000C-IC23.rar
286-SUNTAC SA073155.jpg
286-SUNTAC SA073155b.JPG

Is it maybe possible to dump the Keyboard bios rom? The main roms works fine, but input of the keyboard is locked.. I think that the current Keyboard bios for the Phoenix bios isnt compatible with the AMI bios set.

~ At least it can do black and white~

Reply 156 of 164, by HanJammer

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Robin4 wrote on 2021-01-15, 07:03:

Is it maybe possible to dump the Keyboard bios rom? The main roms works fine, but input of the keyboard is locked.. I think that the current Keyboard bios for the Phoenix bios isnt compatible with the AMI bios set.

It's not a keyboard BIOS - it's keyboard controller. Think of it like Atmega on Arduino, but it's MCS-48 series microntroller (of course it has it's own ROM buried inside). I think Willem and some older programmers support MCS-48 series, but likely it won't be possible to dump the ROM content from them.
Keyboard controller is quite independent and it shouldn't really matter what kind of controller you install in the motherboard (the later ones with more advanced firmware and programmable rates may not work). Unless motheboard has it integrated in the chipset (I've seen boards like these) - they are all pin compatible with Intel 8042 (at least in 286 motherboards) and from my experience - compatible with each other.

Check out my AmiBay and eBay for ISA and PCI card, 286/386/486 Pentium motherboards and more.

Reply 157 of 164, by Robin4

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The MR bios also doesnt work.. with this phoenix keyboard bios. I think its only compatible with AMI or AWARD.

But keyboard controller is not a keyboard bios?

but likely it won't be possible to dump the ROM content from them.

Are they locked or fused? (single time programmed?)

I think i need a replacement controller then if i wanted to get it working.

So you cant program these MCS-48 series microntrollers by your self?

~ At least it can do black and white~

Reply 158 of 164, by Predator99

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I don not understand...does the MR-BIOS not work in a board that works with another BIOS...?

The keyboard controllers are interchangable between manufacturers, see my post dated 2019-05-07, 15:02 in this thread. You cannot copy them, there also no need to do that because you can take one from another board.

Reply 159 of 164, by Robin4

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MR-BIOS and the AMI bios that i downloaded from one of your boards (was the second one) work ok. (thanks for that). System goes on.. Both non-working keyboard (locked) and also got a keyboard error.

With the original Phoenix roms its works just fine, and also the keyboard working fine. So the keyboard controller which i know is working and it came with the Phoenix bios set. Doesnt seems to work with the AMI BIOS set and MR BIOS SET.
I also tested it with a working AWARD 286 bios set and i gave me also a keyboard error / non working keyboard.

So my conclusion here is that Other bios sets then Phoenix bios would not work with that phoenix compatible keyboard controller / keyboard bios chip)
Also tried a second M5L8042 which gave me an keyboard error.

Maybe the ICs are pin compatible, but keyboard bios code maybe not.

~ At least it can do black and white~