[sebhc] H17 ROM ?

Steven Parker sp11 at hotmail.com
Fri May 21 16:49:27 CDT 2004

Dwight says:
>  The other file he should look at, if he is going to trap
>I/O is H17def.acm.

That's one of the "associated header files" I was referring to.  :-)

>Also, one of the two, u8250.acm or u8251.acm.
>I forget which was on the H17 card. I think it was the 8251.

No, those are both I/O card chips (8250 in the H8-4, 8251 in the H8-5).
The H17 uses a S2350 USRT.  Those are the ports defined in h17def.acm.

>There was a timing error
>... for someone doing direct calls to
>the ROM, one should be aware of this.

Yea, if you were writing 8080 code to USE the disk.   Not if you're writing 
PC code to EMULATE the disk.  :-)


- Steven

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