[Coco] Formatting L.R. Tech Hard Drive in OS9 Level II

[Barry Nelson]

In an earlier post I described how you can adapt a 28 pin EPROM to a 24 pin socket. I was running like this before I got my CoCoSDC cartridge. I used a larger EPROM and attached a switch to the extra address line to select either HDBDOS or RSDOS.

>        Mark J. Blair nf6x at nf6x.net  <mailto:coco%40maltedmedia.com?Subject=Re%3A%20%5BCoco%5D%20Formatting%20L.R.%20Tech%20Hard%20Drive%20in%20OS9%20Level%20II&In-Reply-To=%3C317189F9-DBD1-4149-AF70-1ED1AE894416%40nf6x.net%3E> 
Tue Jan 12 02:00:18 EST 2016 

 

Ø  On Jan 11, 2016, at 22:34, Barry Nelson <barry.nelson at amobiledevice.com <https://pairlist5.pair.net/mailman/listinfo/coco> > wrote:

>         > 
Ø  I have seen several Radio Shack drives that were in fact double sided. They did this because they used the same drives in their IBM compatibles.
 
>         Interesting!
 
>         Both drives in this FD-500 (one original, and another mismatched on that I added myself) are single sided, but I'll put my dual Teac FD-55B drive box back together. I had borrowed one of its drives for the ImageDisk PC.
 
>         I might either load up HDB-DOS from cassette as suggested, or burn an EPROM and temporarily swap it in place of the Owl Basic EPROM in the floppy controller that came with this hard drive system.
 
>         I wouldn't mind getting my hands on another CoCo FDC cart with a 28 pin EPROM socket to dedicate to HDB-DOS, since that might be convenient to have on hand. I think that all of my other FDC carts have 24-pin sockets with the mask ROM pinout, and I don't have any of the pin-compatible EPROMs on hand. If anybody has one to sell or trade, please drop me a line. I'd love to add a JFD-CP to my collection, but one of the other FDC carts that were made with 28 pin EPROM sockets would also be useful.
 
>         -- 
>         Mark J. Blair, NF6X <nf6x at nf6x.net <https://pairlist5.pair.net/mailman/listinfo/coco> >
>         http://www.nf6x.net/