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R.I.P: Commodore disk drive related items
Track 0 light barrier support of the Commodore 1541C drive
When preparing the SpeedDOS ROM collection for a detailed
test session of
Nicolas Welte's 6502-RAMROM, the DOS ROMs for the C1541II
drive were used as basis for the floppy speeder replacement ROMs.
I asked myself, if the C1541II ROM does also contain ROM code to
handle the track 0 light barrier of the 1541C series drives. The
following text provides a deep analysis of the ROM differencies to
clarify this question.
Using the Burstmode of the C1571 and C1581 drives with the C64
In a
newsgroup discussion
there was a little talk about the possible advantages, if a C1571
is connected to a C64. A book from Rainer Ellinger,
»COMMODORE 1571 &1570; Das große Floppybuch«, was
mentioned, that presented a hardware modification and a kernal
patch to utilize the Burstmode on a C64 at the pages 188ff. In the
german magazine »64'er«, issue 09/1986 at pages 50ff
another such a Burstmode Kernal was described with a slightly
different hardware modification (using CIA2 instead of CIA1).
Pasi Ojala developed a Burstmode Fastloader for the C64, presented
in the
C=Hacking
Magazine Issue 19.
Unfortunately he didn't create a Kernal ROM replacement yet.
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Floppy1571-Burstmode.pdf
(2003-03-09,
374KB)
Lowres scan of pages 188 to 193 from Rainer Ellingers book about
the C1570/71 disk drives.
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C64-Burstload-Kernal-05.txt
(2003-03-09,
14KB)
Converted eText from the book above, 5th proof read edition with
annotations.
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FSD-System_ASM-Source.txt
(2003-03-09,
26KB)
Converted text from the ASM source listing of the
»64'er« FSD-System.
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C64-Burstmode-Kernals.zip
(2003-03-09,
28KB)
ZIPped D64 image file with C64 Burstmode files and readily
prepared Kernal ROMs
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Burst Fastloader for C64
Pasi Ojala's web page about a Burstmode Fastloader for the C64
which may be updated from time to time.
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64'er 5/89 BDOS
This article (german) describes a powerful transfer system for
the C64 and C128 from Andre Fachat. It describes some Userport
hardware to rebuild the additional Burstmode circuits of the
C128 (bidirectional transceivers) for the C64. One of the
download links contains a picture with the schematic.
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