From: ruud.baltissen_at_apg.nl
Date: Fri, 17 Jul 2009 15:44:50 +0200
Message-ID: <3FAF2D74FB701448B997B2CB7A0076C20F4C0BAF@winsv116.office01.internalcorp.net>
Hallo allemaal,

1541IDE is nearing the end so I'm thinking about 8050 already. As I once
said my idea was to replace the 6530 with the IDE-circuit plus some ROM
and RAM. One reason I proposed this because I thought I _HAD_ to replace
the 6530 because of the ROM. But I just realised that this is
unnecessary at all: the ROM is activated by a seperate pin, just tie it
to + 5V and add my own EPROM. Advantage: in this way it could be
possible to use the floppy disk and harddisk at the same time (with
1541IDE it is either or).

A small drawback that I only realised some days ago, is that, although
the Disk Controller (DC) part of the 8x50 is equiped with a 6502, it is
only used as the 6504 on the 4040: the 6502 only uses one 8 KB range,
A13..15 are not connected at all. The 6530 only provides 1 KB of ROM. I
can expand it to 2 KB. But I only hope that I don't need more. The
reason for this is that I expanded 1541IDE with a lot of extra functions
but I have no idea yet which ones should be executed by the DOS-6502 and
which ones by the DC-6502. And using both the FD and HD will consume the
most space of the available 2 KB.

    / __|__
   / /  |_/     Groetjes, Ruud
   \ \__|_\
    \___|       URL: Ruud.C64.org


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 2009-07-17 15:57:33

Archive generated by hypermail 2.2.0.