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Howard81
Joined: 21 May 2006
Posts: 47
Location: London, England
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Posted:
Sun Jul 09, 2006 11:34 am |
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Does anyone have any idea what this card is? It was in the XT I just picked up. Previous owner had no idea what it is, so I guess it was put in by the company who bought the XT new. It was used for accounting.
Card looks home-made from a kit and has no input or output on it. The only markings on it are "Delta Digital Design" on the silkscreen, and 12224/2468 written in marker pen.
![Image Image](http://www.howard81.co.uk/upload/vcf/xt/newxt/xt_weirdcard2.JPG) |
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Puckdropper
Site Admin
Joined: 02 Oct 2004
Posts: 766
Location: Not in Chicago
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Posted:
Sun Jul 09, 2006 6:52 pm |
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Here's what your chips are:
74HCT688N:
8-bit Magnitude Comparator
74LS00N:
Two input NAND gate
DM74LS37N:
Octal D-Type Transparent Latches and Edge-Triggered Flip-Flops
N82S123N:
Sub Data IO 29B.
256-bit TTL bipolar PROM 32 x 8
16 Pin DIP
SN74LS174N:
Hex D-Type Flip-Flops With Clear |
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Howard81
Joined: 21 May 2006
Posts: 47
Location: London, England
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Posted:
Sun Jul 09, 2006 11:56 pm |
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Thank you! Now to work out what that combination of chips actually do...
Could it be some kind of homemade FPU? It's the only thing I can think of that wouldn't require I/O on the card. Plus the XT was used for number crunching... |
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VONVEGA
Joined: 20 Jun 2006
Posts: 4
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Posted:
Mon Jul 10, 2006 10:02 am |
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Bus adapter for non standard ISA cards?
Looks like the card, when a concrete status of bus is meet, it may power and modify the bus pinouts. Also can be a kind of hardware protection key. Maybe it demands a password at bootup and denies to power the bus w/out it. |
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Howard81
Joined: 21 May 2006
Posts: 47
Location: London, England
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Posted:
Tue Jul 18, 2006 10:34 am |
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It's strange, since my XT does not have any non-standard cards in it. And there is no asking for a password on startup.
The previous owner of the XT does not know what it is.
It is really a mystery to me ![Smile](images/smiles/icon_smile.gif) |
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harshbarj
Joined: 01 Oct 2004
Posts: 169
Location: behind you!
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Posted:
Fri Aug 11, 2006 8:51 pm |
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Perhaps it's a hardware key? You said it was used for accounting so perhaps the software they used required this card to run (a form of copy protection). Where I work we have many programs that will not work without a specail adapter pluged into the printer port. Perhaps this is a early version of that? (as I can't see what else it could do). |
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Howard81
Joined: 21 May 2006
Posts: 47
Location: London, England
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Posted:
Sat Aug 12, 2006 6:10 pm |
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That could be true. The XT had Wordstar v3.4, Lotus 1-2-3 v2.1, Sidekick and Norton Utilities v4.0 on the hard drive, but apart from that nothing else. The drive had never been formatted since the machine was new, but I had to low-level format it to get it working perfectly again. |
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Robo
Joined: 09 Sep 2006
Posts: 3
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Posted:
Fri Sep 15, 2006 3:26 am |
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I'm inclined to agree with them. The PROM connects to the buffer which goes to the I/O data lines of the card. (the second to the 9th pins on the ISA card) I have one around here from novell, I never did figure out what it was for albeit something like Netware server security wouldn't surprise me. |
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