Commodore Variable Speed Drives???

References: <199706200702.AAA08312(a)lists.u.washington.edu> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sorry to burst your bubbles, but the Commodore drives ARE 300 RPM like most of the others, many 1541 flywheels have the speed-calibaration diagram on them (use fluorecent light to determine correct RPM). 154s and the lot have software&hardware to adjust the density on tracks so more data can be stuffed in inner tracks and allow the outer ones to spread out. No special speed involved here. It is because of this that many computers with dumb drives can't read the 1541 format (including Amiga!) the controller cards seem to be limited in this fasion. Thus there is quite a demand for 1541 drivess and (pre-converted) .d64 files in the 64 emulator community. ;) I think all the 5.25" Commodore drives were based on the variable density initiated in the 2040 DOS. My Complete Commodore Inner Space Anthology has differing sector counts on tracks on all the models (4040, 2031, 1541, 8050, 8250/SFD-1001) The hard drives (9060 & 9090) seem to be uniform thoough. Things changed with the 1581 disk (3.5") which uses a variation of the MFM format, and can be readable with PC/Amiga computers (with the proper software, of course.) -- Taking quotes from that LA article on collecting: Yep, translates to modern-day very well. $2,600 for only 35 machines???? Anyone have his address, I have some 64s for him! -- "Altairless" Larry Anderson -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- Visit our web page at: http://www.goldrush.com/~foxnhare/ Call our BBS (Silicon Realms BBS 300-2400 baud) at: (209) 754-1363 -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-