1571 mode in 64
Jack Tseng
1571 diskturbo in C64? I try 1541 diskturbo in 1571 mode. It does not work.
it is used for only 1541 mode in 1571. I need double side formatted for C64.
JT
Ruud
> .... It does not work.
When in 1571 mode, the 1571 switches to 2 MHz. Any 1541 diskturbo
programs is meant for a 1 Mhz enviroment and therefore won't work in
1571 mode.
When in 1571, any standard command still should work, including
formatting a drive using OPEN1,8,15,"N0:<name>,<ID>":CLOSE1.
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Rudolf Harras
There is no speed advantage if you use your 1571 in C64 mode. The only
advantage is that you can use double side formatted disks. But for using
them you have to start in C128 mode first and type "Go 64" or enter open
15,8,15,"u0>m1":close15
if you do this, some fastloaders will work with the files that are
actually on the backside (e.g. the one of the action cartridge 6) and
some won't (e.g. that 6 blocks hyper-load).
also there is a programm called "rubicon" that you can start in C128
mode and that will load a programm of the disk with 1571 speed and then
start it in c64 mode. this only is helpfull for single-filed games of
course.
rusure
At one time, I accelerated 1571 loades in C64
mode using a package of programs from the
RUN December 1989 issue, written by
Michael (BIG BLUE READER) Miller.The
package accelerates 1581 loades as well.
If you don't have the issue, download it from :
ftp://arnold.c64.org/pub/magazines/
Originally, the accelerator was menu driven
with a list of disk files to be loaded. It also
had a bug that could corrupt 1571 disk BAMs.
I modified the package to fix the bug and also
to acclerate loades with the LOAD command.
I have the modification somewher in my BERMUDA TRIANGLE.
rusure
> not work. it is used for only 1541 mode in
One solution would be to use your 1541 accelerators to format a disk
with 2 single sides on one disk. One way to do this is to double
notch a disk, format the primary disk side, remove the disk from the
drive, flip & reinsert the disk into the drive and format the "flip"
disk side. Disk and drive makers recommend against this practice. I
have tried and failed the other way to do this. No second notch is
needed. As before, the primary side is formatted and the command
"U0>H1" is issued. After issuing this command, 1571s operate on the
"flop" side of the disk. (I am making up this language as I write.)
For me, this technique fails when data is written to the "flop" side
with an invalid disk ID diagnostic. I think the drive checks the
"flop" side ID for its validity with the primary ID. I have never
explored what would happen if both primary and "flop" sides had the
same ID. You probably could do file copies to disk "flop" sides but I
don't think disk copies from source disks with IDs different from the
target disk ID would work. I am sure there are other unanticipated
problems.
There are many later drive accelerators that were made after 1571s
started selling. Among these are the MACH 5 and 128 as well as WARP
SPEED cartridges. The accelerator that has the most support is
JIFFYDos. This requires the replacement of computer and drive ROM
chips with JIFFYDos replacement chips. I think I saw somebody (Jim
Brain?) selling these chips.