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Re: Disk controller

Subject: Re: Disk controller
From: simcop2387 <simcop2387@gmail.com>
Date: Tue, 22 Nov 2005 19:58:17 GMT
Newsgroups: comp.emulators.apple2, comp.sys.apple2
Organization: RoadRunner - Carolina
References: <pan.2005.11.21.20.10.41.409727@gmail.com> <1132606498.239878.220120@g44g2000cwa.googlegroups.com>
User-agent: Pan/0.14.2.91 (As She Crawled Across the Table)
Xref: g2news1.google.com comp.emulators.apple2:494 comp.sys.apple2:6883

On Mon, 21 Nov 2005 13:02:48 -0800, josephoswaldgg@hotmail.com wrote:

> If there is garbage at $800... it is because either your disk (image)
> is screwed up, or the controller did not see accurate data in the read
> register.

after some investigation it appears to be that there is some bit twiddling
going wrong in the reading, its more than likely a bug in my cpu core (oh
well, i'll fix it)  many of the bytes end up with their LSB incorrect, for
some reason, i'm still tracking down the place where it happens, no clue
yet.

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
Updated: 2005-04-19
GCS/CM/M/S d-(--) s:+ a-->->>+>++>+++$>?$ C+++(++)>++++$ ULB+++(++)>++++$
P++++>++++$ L++++ E----(@) W+++ N++ o? K? w---(--) O-- !M V? PS+ PE Y++
PGP++(+++@) t+(++) 5 X+++(++@) R(+) !tv() DI++++ b+ D++ G++ e*()>++>++++$
h(*)>---- r++@>+++ !y?(**)
------END GEEK CODE BLOCK------

References:
- Disk controller
  - From: simcop2387 <simcop2387@gmail.com>
- Re: Disk controller
  - From: "josephoswaldgg@hotmail.com" <josephoswald@gmail.com>

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