🚀 go-pugleaf

[This is reposted from comp.sources.wanted since it could not
 seem to get to me any other way.... -- sob]

About nine months ago I successfully modified a driver for the IKON
parallel board so that it would run on a Sun/2 ( hurrah! ).  IKON is
a truly marvelous company ( in my opinion ) which makes DR11-W
emulator boards for everything under the sun.

I am now faced with attempting to port this driver again, this time to
a MASSCOMP machine.  The driver opens, closes and ioctls just fine, but
staunchly refuses to DMA in either direction.   Further examination
shows that reading the CSR from the kernel always gives unintelligible
garbage.

Things I have tried:  
    (1) checking my register locations very carefully;
    (2) various byte-swapping schemes using the dip switches on
	the board and/or in software;
    (3) various kernel printfs.

I have not yet tried to extend the Multibus and actually look at the
signals.  I have tried to contact the Masscomp User's group by mail,
without success.

Anyone out there with any experience with the Multibus IKON board, or
with writing MASSCOMP device drivers, or both, please help!  This is
an urgent project ( turning into a raw nerve... ).  Anyone who would
like to give us ( sell us ) such a working driver, offer advice, heap
scorn on my foolishness, or otherwise, please mail me.  Thank you in
advance.

Multibus is a trademark of Intel Corporation;
MASSCOMP is a trademark of Massachusetts Computer Corporation;
IKON is a trademark of IKON.

I am not affiliated with any of them.

	Mark C. Reynolds
	...!{harvard,ima}!bbn!aoa!mark
	...!{wjh12,mit-vax}!biomed!aoa!mark

[Do you have a copy of the Device Driver Manual? It really helps with
this kind of stuff. -- sob]