Hi Pete, Agreed on the Z80 disk pack - doesn't appear to have ever had anything other than drives and a cable in it. The PSU is still intact, so it'd be complete again with the addition of drives (which I now have plenty of spares of!). No idea why it's grey rather than brown, except that so are the XXX 'prototype' and the 725 machine. think. Fair call. One's an 'Atlas' board, which is what the 725 machine also has in it. The other is a "Torch 68000 board" and seems to date from a year earlier (1983 rather than 1984). the earlier board has an 8MHz 68k, the Atlas board a 10MHz - but both have CCCP 1.02 ROMs so I expect they behave identically, with one just being slower than the other. given that the 68k boards have CCCP ROMs too I'm not surprised :) pin I found the manuals to these (and all the other interface boards that I have I believe) - it seems the cards with the three 20-pin connectors on have SCSI interfaces. The C520 machine meanwhile has a Torch SASI controller in it and one of the "2 connector" Xebec boards is plugged into that - so unless a SASI controller can drive a SCSI device, the "2 connector" Xebec boards have a SASI interface. sure, I'm a bit snowed under at the moment so it might not be for a few weeks - plus I need to find a good way of copying the disks unless my PC's controller will read them. I should have spare Torch ROM sets for everything so I can always copy the ROM if I can find a good way of doing it (I've got that EPROM programmer for the Apple 2 but getting data onto and off the machine needs figuring out). worst-case there'll be a way of me reading the data via a BBC and mailing it to you I suppose! in identify It sounds like one of these: http://www.machine-room.org/computers/6360/technical.html Of course the website info may be innacurate; and piecing together information about exactly what Acorn produced in the early days is proving hard - what little data there seems to be on the web is generally labelled with disclaimers as to accuracy! :-) I've since found I have manuals for some of the 'other' cards that seemed to be available (which I believe worked with the later 'system' machines): o Laboratory Interface Manual o Visual Display Unit Interface Board technical manual (issue 1, dated 1979), also mentions the same teletext decoder as used in the BBC so looks like Acorn were messing around with that even then. o Acorn 32K DRAM technical manual (issue 3, 1982) - looks to be designed for the 'system' machines or the Atom. o Acorn Extension Memory Board manual (issue 3, 1980) - an 8KB board o PROM Programmer Board manual (Issue 2, 1981) o VIA Board (Issue 1, 1980) o Acorn Analogue Interface technical manual (Issue 1, 1980) Looking at the list, you can see where the BBC had its origins :) rats, I'm missing that unless it's been tucked away inside something else. Hmm, I may have to ask you nicely for a copy of that sometime and build one of these to go with my Atom... I think everything else I need is covered in the manual (my Atom's had the memory expansion and BASIC upgrade anyway so it's not a 'pure' original) [ BBC FITs] What I have is a copy of a confidential Acorn pre-release manual for the FIT and the PET which makes it a little unique :) But yes, it has listings for the A and B machines. It wouldn't surprise me if copies of the associated manuals are still at the house where I got all this from; stuff from all kinds of machines was just *everywhere* so there's likely a lot that was missed... cheers, Jules ________________________________________________________________________ Want to chat instantly with your online friends? Get the FREE Yahoo! Messenger http://uk.messenger.yahoo.com/