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What is this motherboard ?

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andromeda92

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What is this motherboard?
I am looking for information for this motherboard.
6 isa, AMD 286, 1MB ram, chipset winbond
Thank you.
 

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yes is this.
The documentation is minimal but it does not matter.
I need to find ram sipp 30 pin or adapter sipp to sim.
Than you.
 
Not just a drop in replacement then - the original is likely rechargeable, so you'll have to install a diode in to prevent it from trying to charge the cr2032.
 
It's possible to do, you'll just have to install a diode. Not sure the value as I haven't done so myself before, maybe someone else can chime in on that.
 
Schottky diode is the best (low forward drop), e.g. 1n5819; even a lowly 1n4148 diode would do the job at a somewhat higher forward drop (~~0.7V).
 
I wouldn't. A lot of rechargeable coin cells are rated at 3.0V, but the original NiCd, I believe is rated at 3.6V--and the charging curves for Li coin cells are very different from NiCd ones. If you really wanted a rechargeable in there, I'd probably substitute a 3.6V NiMH pack. Charging curve isn't identical to an NiCd, but probably close enough.
 
andromeda92 said:
yes is this.
The documentation is minimal but it does not matter.
I need to find ram sipp 30 pin or adapter sipp to sim.
Than you.
Click to expand...
Hi,
I've had such SIPP RAM on my 286 when I was a student. They were ordinary SIMMs with soldered Tulip headers. It cost an arm then (around 1991), like 400 FRF each 1 MB simm.

I wanted to DIY such SIPPS a few years ago. With a good soldering iron, some attention, a magnifier and time one could do it quite easily.
Alas the motherboard I intended to use appeared to be too corroded due to a leaky battery. So yes, do remove that d@mn battery from hell before it's too late.
 
For example this ?
3.6v 40mAh NiMH

or this 3.6v 80Mah NiMH
 

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If you find the documentation on that board, maybe one of the pin headers near that battery are for use with an external battery. If so then it's pretty easy. Just get a battery pack that holds three or four AA cells and attach the wires to the external battery header on the board.

You can probably use the board without a battery, but it may become annoying to have to keep entering the setup info on each boot. I have a couple systems where I did that until I finally broke down and added an external battery. My IBM XT-286 still needs a new battery but it boots from the hard drive anyway so I keep putting off getting a battery.

Seaken
 
there is minimal documentation on the retroweb site made by a person from voggons, but it does not mention this jumper, and no information on my version of the card on the 4 pin headers next to the battery.

I will take a closer look, if there is a jumper allowing an external battery, otherwise I will try a 3.6v NiMH battery or a CR2032 with diode, I wanted to avoid the system with the diode because I do not know where I should connect the diode, one goes in the + and the other probably on the pin of a diode.
 

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You'll have to determine whether the board attempts to charge a battery hooked to the external header. If it doesn't (e.g., because a typical battery to connect to one of these headers was a 4.5V Rayovac alkaline battery pack) you may not need to modify the board or incorporate a diode at all. You may find 3.0V across the external battery not to be enough to run the clock while the board is powered off. I find 3xAA holders (so 4.5V) to be trouble free. Some are reluctant to use that because they are bulky or fear of the cells leaking.
 
Easiest way to deal with SIPP is to get 30pin sockets, and just push them into the SIPP sockets. No joke. Bought same price as the pins. Or if you are like me and have a bunch of eprom sockets, you can harvest the pins from those.
 
I already have the sipp sockets on the motherboard, I just need to have the 30 pin sipp ram.

there are several models of this motherboard, if you look at this photo, the sipp connectors are arranged in a different way than the photo above
 

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I think that @twolazy means shoving a SIMM socket into the SIPP socket and using SIMMs (somewhat more common). I bought my first SIPPs from a guy in San Jose who had a small business making SIMMs/SIPPs. Basically, just stuffing some DIPs into a circuit board made for the purpose. If a SIPP was desired, pins were soldered to the SIMM edge connector.
 
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