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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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 Posted: Sun Nov 19, 2017 4:11 pm Post subject: Can you identify this slot? |
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I just bought this board for the Weitek socket. Can anyone identify the slot at the bottom? Looks like 8-bit ISA plus 16-bit ISA, but that would make no sense. I can't see a purpose for the 16-bit ISA part.
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Qwerty
Joined: 20 May 2005
Posts: 3141
Location: Germany
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| Posted: Mon Nov 20, 2017 8:29 am Post subject: |
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| In my opinion, it's a proprietary slot for memory expansion. |
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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debs3759
Joined: 18 Jan 2006
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Location: Northampton, Divided Kingdom
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| Posted: Mon Nov 20, 2017 1:15 pm Post subject: |
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Thanks. I can't see the traces well enough to see where they go. With 16 SIMM slots, it never occurred to me that they would provide the means for more 
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max1024
Joined: 15 Jan 2015
Posts: 636
Location: Belarus
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| Posted: Mon Nov 20, 2017 1:45 pm Post subject: Re: Can you identify this slot? |
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It is External memory card slot.
It may look like this:
http://arvutimuuseum.ee/th99/m/A-B/32979.htm
| debs3759 wrote: | | I just bought this board for the Weitek socket. Can anyone identify the slot at the bottom? Looks like 8-bit ISA plus 16-bit ISA, but that would make no sense. I can't see a purpose for the 16-bit ISA part. |
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debs3759
Joined: 18 Jan 2006
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Location: Northampton, Divided Kingdom
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| Posted: Mon Nov 20, 2017 1:48 pm Post subject: |
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Great, I now know what to look for. Thanks
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max1024
Joined: 15 Jan 2015
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Location: Belarus
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| Posted: Mon Nov 20, 2017 2:01 pm Post subject: |
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debs3759
Not at all |
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xsecret
Joined: 01 Feb 2004
Posts: 1847
Location: France
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| Posted: Mon Nov 20, 2017 2:03 pm Post subject: |
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This kind of slot on OPTi 386/486 motherboard is often a specific slot for memory expansion board.
This said, on this specific board, it's an external cache slot. It works with a proprietary 128 KB board. You have to close 1-2 on J2/J3 to enable it.
It's a rare but nice 486 board. This chipset doesn't support more than 1MB SIMMs, so 16MB max and it's limited to 25 MHz, but if you can solve the damages from the battery leak, it works fine
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