Date   : Fri, 20 Jun 1986 16:03:00 GMT
From   : kenny@uiucdcsb.ARPA
Subject: Re: Misusing Z80 registers

/* Written  3:48 pm  Jun  8, 1986 by hildum@ucb-vax.ARPA in uiucdcsb:net.micro.cpm
*/
/* ---------- "Misusing Z80 registers" ---------- */

If you assume that a program should save the ix, iy, af', etc registers
before calling the operating system, then Turbo Pascal falls into the
catagory of misusing registers.  It expects the index registers to be saved
by the operating system, which, unfortunately, my VT180 does not do.  This
causes the find and replace operations in the turbo editor to fail.

                               Eric Hildum
/* End of text from uiucdcsb:net.micro.cpm */

It's fairly common for BIOSes (BIOTA?) to clobber the index registers.  My
Altos 5-15 does it, too, which explains why the Turbo editor doesn't work on
it, either.  Philippe, are you listening?