Bad block login for hp driver under V7

[utzoo!duke!chico!harpo!mhtsa!eagle!ucbvax!CSVAX.wnj at Berkeley]

we have bad block stuff in a vax 4.1bsd hp.c.
it is probably quite different from your hp.c, but the bad block
code might be what you want.
i will mail you a few relevant files, and you can see if they will help.
	bill