> On 3 Dec 2018, at 00:22, Fred Cisin via cctalk <cctalk@classiccmp.org> wrote: > >>> When they went to 400K 40 cylinder MFM DSDD / double sided, double density, >>> still 48 tpi (like the PC-DOS 360K), they chose to call that "QD" / "QUAD >>> DENSITY"!! ?!?? (equating "density" with capacity) WHOA! Everybody else >>> called THAT DSDD "Double Sided Double Density", and used "QD" / "Quad >>> Density" to refer to 80 cylinder Double density 96tpi! > On Mon, 3 Dec 2018, Adrian Graham via cctalk wrote: >> So I’ve been reading :) I’m sure they weren’t doing it deliberately, hahaha. > > It's hard to say. At NCC, at the Intertec booth, they could not understand > WHY anybody would want to transfer files between disk formats, other than to > PIRATE their "proprietary software"! They even threatened to sue me if I > included it in XenoCopy! > So, they were not heavy into interoperability with other brands.
Was any manufacturer? I does seem to me that everyone deliberately made their CP/M format different despite using the same or similar chipsets. I was surprised to read in the docs for my Osborne Executive that it COULD read a couple of other formats. > That was the first time that I added a format to XenoCopy while in a hotel > room. (Televideo was the second!). NCC was great. In addition to those two > formats, in exchange for buying him lunch, John Draper told me everything > that I needed to know to add UCSD P-System formats - (I did NOT exercise with > him.) Intertec did not keep their promise - I could have used the free ink. What machine were you using for hotel room coding? > One more caveat! Radio Shack repurposed pin 32 (SIDE SELECT) to use as their > fourth drive select, and did their drive select with their cable, rather than > the jumpers. So did IBM, although they jumpered both drives as second drive, > rather than ALL jumpered as RS had done. IBM also used them, as well as the > TM100-2 (DS), so there are a LOT of sources for the manuals. This pair are jumpered as I’d expect, DS0 and 1 with a terminator block. The manual says they’ll work with multi-hole floppies so I’ll strip them down later and give them a good clean. -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest private home computer collection? t: @binarydinosaurs f: facebook.com/binarydinosaurs w: www.binarydinosaurs.co.uk
