At 09:25 14/02/2002, you wrote: >Adrian Vickers wrote: > > Unfortunately, the boards are entirely different. Excluding the 'LPs > > daughterboard, there are the same number of what I assume are firmware > > chips (identified as 901887-01, 901888-01 and 091467-01), but I wouldn't > > like to try to swap them. They have a different number of pins, for > > starters... :) > >There are two different versions of the 8250LP mainboard: One takes the usual >24pin ROMs from the 8250, the other one has 28pin sockets for 2564 EPROMs. Mine is one of the latter type, then. >I >tried to put ROMs into the EPROM sockets, it doesn't work. Erm, no, it wouldn't.... >You can safely replace the 6530 on the adaptor board with the 6530 from the >8250, or you can even replace the whole adaptor board with a 6530. Damn! I tried that, and presto! Drive booted normally (it even returned 2.7 as the DOS version when queried from my 8032-SK. Tried replacing the adaptor board + old 8250 chip, and it worked - but not correctly by a long shot. Still returns "drive not ready", although you can send it an "Initialize". It will then attempt to read one or the other drive (irrespective of whether there's a disk in it or not), but fail with a "read error", then "drive not ready" errors until reinitialized, whereupon it tries the other disk, repeat ad nauseum. I thus conclude that: The 6530 (imprinted 901885-04 0683) is blown, wheras the 6530 (imprinted 901885-04 0383) is okay, but the wrong version to correctly drive the, erm, drive. So to speak. So, anyone got a spare 6530 (with "901885-04" printed on the top line, and "0683" printed below it) they'd be willing to part with? Alternatively, if you're in London, could I borrow one for a day to try it out? Thanks! There's hope for the old monster yet! -- Cheers, Ade. Be where it's at, B-Racing! http://b-racing.co.uk --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.314 / Virus Database: 175 - Release Date: 11/01/2002 Message was sent through the cbm-hackers mailing list
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