>Hello Sluggers
>
>I have an XT board that drives a dual led display (jargon block - like
>the old speed display on your case).
>
>HW - how can I find out it's I/O address, IRQ, etc?
I have found that the best utilities are actually a couple of DOS
programs: debug and ioview. The latter can be found at Simtel. With the
latter you can observe I/O space. And even lock up your machine if you
happen to have a NE2000 installed. With debug you can twiddle port bits.
But what you have is actually a POST card, lucky you. Read on.
>Does anyone know of any code that I might be able to mod/use to find
>out it's address and later drive it.
>
>Basically, the board was a Showpost board built by Custom Built
>Computers in 1993 and it show hexadecimal codes as the system powered
>up and ran it self test. The codes were particular to each
>motherboard.
>
>I'm considering using it as a generic display board of some sort, say
>cpu temp, case temp, time or the hour, etc.
POST cards are at port 0x80 IIRC. It is written to by the BIOS during
the self test phase and will show at which stage where the hardware
failed. Just fire up debug and output some hex bytes to port 0x80 and
watch the display change. No IRQ involved BTW.
Here's a good URL on POST:
http://www.u-net.com/epr/electron/issue2/feat0602.htm
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