User guide

1541 Ultimate User Manual

http://www.1541ultimate.net/

 C64 may turn a black screen when powered up while the IEC cable

is connected to the 1541U, and show the normal blue BASIC

screen when it is disconnected!

Because a PSU that delivers too little current may cause the components

on the 1541U to take longer to power-up, you could leave the C64

powered on for a couple of minutes, and then do a power-cycle (turn C64

off, then on again). If the C64 and 1541U behaves correctly (at least a bit

better for a while, while the components are drained) the PSU problem

will be confirmed.

There probably is a reason why real disk drives are externally powered….

Renegade/Maverick copier

Renegade/Maverick copier is not compatible to the Fast Loader of the

Action Replay family cartridges. When booted it will show a garbled

startup-screen. You should boot into NORMAL RESET, and use

LOAD’*’,id,1 to boot this software.

SuperSnapshot cartridge

The SuperSnapshot cartridge does not cope with 3

party drive kernels.

WarpCopy and real 1541 drives

WarpCopy 0.6 does work with 1541 Ultimate using firmware 1.5, but

there always seem to be timing issues at firmware 1.5. For me I found that

it works best if I write directly to the 1541U’s Emulated drive instead of to

a real drive. Depending on the real drive I use, I had different flaws,

including an almost unresponsive real drive. The drives themselves are

known to be in fully working condition.

1541U Freezer failure

The freezer of the 1541 Ultimate seems to have some issues. These issues

are not solved in firmware 1.5. You can notice freezer failure when you

enter the menu of the 1541U, and then leave it. The program you were

running might react strangely, or might even be unresponsive. One known

problem is that firmware 1.5 is not able to sample the raster IRQ high bit,

bit 7 of 0xD011.

Diskchange issues

Diskchange detection is not yet fully functional, it works, but there are

some issues. Even the freezer might corrupt things, so problems when

changing disks might be related to the freezer instead of to the Diskchange

option.