Re: upgrading CBM-3040?

From: Spiro Trikaliotis <ml-cbmhackers_at_trikaliotis.net>
Date: Thu, 16 Nov 2017 07:29:19 +0100
Message-ID: <20171116062919.GA20297@hermes.local.trikaliotis.net>
Hello Ethan,

* On Wed, Nov 15, 2017 at 07:46:06PM -0500 Ethan Dicks wrote:
 
> I was under the impression the half-height 2031 format (DOS 2.6) was
> identical to 1541, not 1540.

As far as I know, the difference between the intra-sector-gaps was not
very well documented. That is, "essentially" and "in an ideal world",
the on-disk format of 2031, 1540, 1541, 1570 and single-sided 1571 is
identical.

> Is there a difference between full-height 2031 and half-height 2031?

I must admit that I do not know. When I speak about the 2031, I always
think about the 2031LP. I do not even know if the ROMs of the 2031 high
profile are available.

However, I would think they would be identical, yes.

Note that both the 4040 and the 2031LP use "8 byte" is intra-sector gap.
It's the same value. It is only the fact that the 4040 writes 8 "data
bytes" which are GCR encoded afterwards, while the 2031LP uses 8 "raw
bytes" which makes a difference.

I would think that noone thought about this difference when the 2031 was
built.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis
http://www.trikaliotis.net/

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