CRC question

On Saturday 10 November 2007 13:58, Chuck Guzis wrote: I will, if I can find it somewhere... At this point the board is in a box, the PS is in storage, and I'd need to rig something up with a terminal and PS to get at it, unless I can find a listing somewhere. I have been poking around since I posted that and there's a bit more on the 'net now than last time I looked, including some docs on bitsavers, which I've downoaded, but that's more assembly instructions and hardware info than code listings. That was linked from a wikipedia page. :-) Best I can remember, the code did a bunch of 16-bit math that seemed to implement some kind of a polynomial (just a bit beyond me when I read it) and ran this over the contents of the EPROM, looking for a zero result. I guessed at that time that you'd have to put *something* into the EPROM to give that result, but how to do so and get the right result wasn't something my assembler skills were quite up to at the time. It'd vary depending on the contents of the EPROM I suppose. I ran across a box recently, too, that I'd been looking for for quite some time. In it were several disks that a guy in Australia (!) had sent me, in Kaypro single-sided format -- best I could deal with at that time since what I had was only my Osborne Exec -- that listed a bunch of BIOS code and alternate EPROM code, setting for example different frequencies for the onboard video, something I'd probalby find useful if I wanted to use that onboard stuff because the composite-input monitors I had at the time didn't seem to be too happy with the default rate (of what, 18 KHz? Something like that?)... At this point I don't have room to set up another monitor anyhow, and would probably just use a serial cable and a terminal program on one of these linux boxes instead, assuming I can find someplace to put the BBII in the first place. Just lookingat the picture in that file I retrieved makes me want to play with that thing a bit. :-) I think, though, that instead of the 2 5.25" drives I was originally intending to use with it (and which are buried somewhere in storage at this point, I have no idea where), I'd like to maybe have a go at interfacing a 3.5" drive to it. And maybe one of the "smaller" (2G?) SCSI drives I have around here. Think that's possible? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin