[TUHS] EGREG

[Andrew Hume]

the evidence looks damning, but i still can’t recall.

i will, however, admit to this driver incorporating some code
my cat typed. i had left my (sam) editor open on the driver
and the cat trampled on the keyboard. unfortunately, it was centered
on a octal constant (setting some bits in a control register) and so went
undetected for a few days. darn kitty!

andrew

> On Jan 17, 2021, at 12:52 PM, Norman Wilson <norman at oclsc.org> wrote:
> 
> Andrew Hume (dammit andrew):
> 
>  i have probed recently about the origins of the bEGREGb (its all greg cession's fault) error in Research Unix.
>  alas, i recall nothing about this, and can't recall ever getting the message.
> 
> ===
> 
> Your memory fails you, which is not unreasonable for stuff you
> probably haven't thought about in more than 30 years:
> 
> /*
> 	SCSI Pass-Thru driver for the TD Systems UD? -- Andrew Hume
> 	Ninth Edition Unix
> */
> 
> [...]
> 
> scsiwrite(dev)
> 	dev_t dev;
> {
> 	register count;
> 	register struct scsi *p = &scsi[minor(dev)];
> 	register struct mscmd *cmd = &p->junk->cmd.msg;
> 	unsigned char flag, bus_id;
> 
> 	if(p->flag&NEXTWR)
> 		p->flag &= ~NEXTWR;
> 	else {
> 		u.u_error = EGREG;
> 		return;
> 	}
> 
> 
> Norman Wilson
> Toronto ON