Posted By
JamesC
on 2005-10-03
22:28:01
|  Re: Using Commodore 1541 disk drive on a Commodore + 4
I forgot to answer the second question..... the Plus/4 doesn't care if it's a .d64 or a .g64, those are disk image formats for Star Commander to deal with. If Star Commander is writing C64 disks that you can read with your 1541 and your C64, then it can write Plus/4 disks. Once it's on a 1541 disk it's no longer a .d64 or a .g64, it's a disk.
Be sure that you are trying to load Plus/4 versions of programs (sometimes a boot program that detects the right computer and loads the appropriate version isn't the first program on the disk). Look for a short 1 or 2 block program near the beginning of the directory, sometimes they're labelled "BOOT" or "START" or "1" or "LOAD" or something that tells you to try this program first.
Ideally the booting program is the first program on the disk, but not always. 
Also.... if you've accessed a file on the disk already, then you do a DLOAD"*", the drive will try to load the last-accessed file. If you've just read a sequential file, then it'll try to load that file again, and it can't cause it's not a program. The 1541 should blink its' red light at you in this instance, and you can PRINT DS$ to see the error message.
To always access the first file on the disk, use DLOAD"0:*". This forces the first file on the disk to be loaded, and also reminds the 1541 that it's drive 0 of unit 8. (Sometimes the 1541 gets confused and thinks it's drive 1, there are a couple of bugs in the 1541 ROMs.)
Alternately, you can hold down the SHIFT key and press RUN/STOP. This does the same as on the C64 but from disk instead of from tape.
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