Description
Magitronic A-B236 Super 286 Baby Mainboard 12MHz Zero Wait - BARE MOTHERBOARD
This Magitronic B236 Super 286 Baby Mainboard 12 MHz Zero Wait motherboard is New old Stock in its Original Box. It has been sitting for over 20 years and the battery has gone bad. Also some of the parts like EPROM, CMOS and RAM chips have been removed long ago, so we have not actually tested these. If you're handy with older computers and have the spare parts sitting around to tinker with, this may be a good fit for you. If you need a 286 motherboard ready to go, this is not for you. The main reason we are offering this for sale rather than scrapping it is it has 8 ISA slots and designed for the Intel 286 CPU, which is also very rare.
- B236 / A-B236
- NEW OLD STOCK in original box and packaging with a manual and software
- Bad CMOS battery
- 2 Sockets for PHOENIX, AWARD, ERSO or AMI BIOS (Any BIOS fully compatible with IBM BIOS)
- 6 or 12 MHz 80286 selective keyboard or by hardware switch, 80286 - 12 CPU
- 2 8-Bit ISA Slots
- 6 16-Bit ISA Slots
Does not include the following:
- RAM / Memory
- Eprom
- CMOS
- CPU
- BIOS
- Please view our photo set carefully and contact us with any questions.
Information from a veteran technician with years of maintaining and using 286 / AT class PC's
- The socket just by the keyboard DIN connector & battery is for a Intel 8042 type Keyboard Controller chip, though sometimes it was covered with a sticker to match the BIOS manufacturer.
- Next, the two same size larger sockets near the memory, those are both for the BIOS chips, 286 PCs had two (with a SMALL number of exceptions). One would be labeled BIOS HIGH/ODD, and the second would be labeled BIOS LOW/EVEN.
- This board accepts either individual DIP chips for RAM (the huge # of small sockets) OR, instead of these, in the 4 rows of in-line sockets next to the DIPS, 4 30-pin SIPP type RAM sticks can be used. These were very short lived in PCs, before being replaced with SIMMs, due to the 30 pins in a row which are easily bent. Only later 286 & very early 386 used SIPP memory. The good news is that those 4 rows of SIPP sockets can be each used to hold a 1 MB SIPP, letting this 286 board have up to 4MB on the motherboard, which is not SUPER rare but it isn't common either.
- The unique looking square black socket is for the 80286 CPU itself, the important thing here is that it is for a "PLCC" style 286. There were several kinds of 286 sockets, plus surface mount, so it can be confusing there.
- Near the PLCC 286 socket, there is one more empty socket, which DOESN'T have to be filled to make the board work; that is for a 287 FPU / Math Co-Processor.
