RE: My finding about the 90x0 ROMs

From: Baltissen, GJPAA (Ruud) <>
Date: Tue, 15 Feb 2011 09:15:48 +0100
Message-ID: <>
Hallo allemaal,

> It might be interesting to compare these parts of
> the code between the two versions for differences.

I have done that. 
- Both ROMs use the same variables with one exception (see later).
- Until the format routine the source code is the same.
- After the format routine the source code is the same as well with one
exception: one extra single STA instruction $F295 in the C version and I
haven't any idea why it has been added.

So the main difference is the format routine. Both version are roughly
the same with one important exception: the B version doesn't use the
variable FormatHead. This is the variable used to format every sector
times the number of heads. I already mentioned that this was an overkill
because the headnumber was already embedded inside the sector number.

    / __|__
   / /  |_/     Groetjes, Ruud
   \ \__|_\
    \___|       URL:

De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de 
geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te 
nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit 
e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. 
Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige 
overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij 
overgebrachte virussen.

APG Algemene Pensioen Groep NV is gevestigd te Heerlen en is ingeschreven in het 
handelsregister van de Kamer van Koophandel Limburg onder nummer 14099617

The information contained in this e-mail is confidential and may be privileged. 
It may be read, copied and used only by the intended recipient. 
If you have received it in error, please contact the sender immediately by 
return e-mail; please delete in this case the e-mail and do not disclose it's 
contents to any person. We don't accept liability for any errors, omissions, 
delays of receipt or viruses in the contents of this message which arise as a 
result of e-mail transmission.

APG Algemene Pensioen Groep NV is registered in the trade register of the Chamber 
of Commerce Limburg, The Netherlands, registration number: 14099617

       Message was sent through the cbm-hackers mailing list
Received on 2011-02-15 09:00:08

Archive generated by hypermail 2.2.0.