Path: utzoo!utgpu!utorvm!ryerson!syst8134 Date: Monday, 11 Feb 1991 15:56:12 EST From: Message-ID: <91042.155612SYST8134@Ryerson.CA> Newsgroups: comp.sys.cbm Subject: Re: Rumour I heard the other day,,, References: <1991Feb2.182102.6157@cs.dal.ca> The 1540 was did run at a different speed and had to have a rom upgrade to make it into a 1541. The reason that you have to say 0: when you load from many of the CBM single drives is that the ROMs were modified from earlier dual drives. Even the 9060 and 9090 hard drives from that late 70's and early 80's have to be addressed as 0:. If you do not use the 0: sometimes the disk drive will go looking for the imaginary drive 1 that does not exist. The only single floppy drive made for the PET series was the 2031 full height and the 2031 low profile. The 2031 was white and the low profile certainly was the same case as the VIC-1540. BUT, the 2031 was IEEE and not serial so the actual logic board was a completely different one to that in the VIC-1540. I would be interested to know if one could change a 2031 to a 1541 by transplanting the boards??? Richard Bradley