🚀 go-pugleaf

In article <4607@batcomputer.tn.cornell.edu> wilker@TCGOULD.TN.CORNELL.EDU (Clarence W. Wilkerson Jr.) writes:
>
>In article <4116@latcs1.oz>, ray@latcs1.OZ.AU (Douglas Ray) writes:
>>
>>A group of us have been asked to write an emulator for the 68000.  It
>>requires minimal character/string io, and for the sake of
>>standardisation we were asked to use CP/M 68k calling conventions.
>>Anyone got any CP/M 68k documentation?
		-douglas ray (ray@latcs1.oz) (LaTrobe CompSci)
>
>There are calls #9 (print a string terminated by $) and 10 ( read
>into a buffer. The first byte is max length of input string, the
>second is actual length, followed by characters input. A ^J or ^M
>terminates the input ( bu t I think is not stored in the string.)
> However, I don't know how parameters are passed in CPM-68k. As near
> as I can tell from looking a a Dr. Dobbs article on a 8080 emulator
> under CPM68k, one loads long addresses into d1, and the function
> number into d0, and then calls bdos (listed as $4e42 )

You got it!  By the way, 'bdos' was my macro for trap #2, and 'bios'
was for trap #3 which was cp/m-68k's way of calling the OS.  The name
binding should be obvious.  For documentation, you can just use the cp/m
2.2 (8080) manuals.  Now isn't _that_ special?  Function code in D0.W,
parameter in D1.L.  Returns values in D0.W.  By the way, don't use the
bios trap is the official word.  Bdos call #59 (?) is a direct bios
call.  The bios trap is not guaranteed to preserve any registers.  The
only reason I mention it is that you can't do simple key-driven I/O (no
echoing or control-c trapping) via the bdos calls -- you have to go to
the bios.  There are several functions (including this one) that need
D1 pointing to a special buffer.  If you really need the real poop I
can try to unbury my manual.

The cp/m calls are disgusting enough that I don't see any reason to
perpetuate their idiot-syncracies any further.  Just conjure up a set
of your own functions and use one of the traps to invoke them.  You'll
be glad you did.

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