Subject: Re: Grrr - !%#*^@# Kaypro!
From: Fred Cisin <cisin at xenosoft.com>
Date: Wed, 03 Aug 2005 19:12:06 -0700 (PDT)
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On Wed, 3 Aug 2005, Allison wrote:
>> Dave, your on track. The CHRN vlaues do
not have to corrospond
>> to actual head or cylinder. They do not even have to be in order
>> on the media! The only limits on them are R must be 1 or greater
>> (less than 255).
>
>Which creates some complications with handling 128 byte sectors (R==0).
Sorry, TYPO. I got sloppy and thought that you were saying the sector
size value could not be 0
???! The value for R must be a valid sector
number. For floppies
that is never zero.
There are a lot of floppies with sector numbers starting with
0.
765 can read them and write them.
Maybe... there are caveats on that. Technically a sector number of 0
should not be used.
Did a lot of work at "NEC" (US arm then was NEC Micromputers USA, then later
NEC Electronics USA.) in the early years when they were developing and
marketing that and a HDC. I was on the hardware/technical side.
Allison