[Simh] altairZ80 floppy disk binary files

[Al Kossow]

On 9/22/14 5:17 PM, Malcolm Macleod wrote:
> Hi Gregg,
>
> The original Ferguson Big Board ("BB1") was released in about 1980.  It's a single-board computer running CP/M 2.2.  It has 64KB of onboard dynamic RAM, a 2.5MHz Z-80 CPU, 1771 FDC and on-board 80x24 video.  It has the same footprint as an 8" floppy drive.  There's a Wikipedia page on it -> http://en.wikipedia.org/wiki/Ferguson_Big_Board
>
> I was aware of the BB1 when I was a kid.  But never owned one at the time.  I acquired 3 of these (2 x BB1, 1 x BB2) a few years ago.  One of these was mounted in a homebrew aluminium case with two full-height 8" drives.  It came with boxes of 8" floppies, and I'm working my way through those and learning about the original-owner's modifications to the on-board monitor ROM and to the CP/M CBIOS (which is also in the ROM).  My immediate goal is to further modify the CBIOS to work with 3.5" drives (in place of the 8" drives).  I've already got it working with single-sided 3.5" disks. The problem is that the CBIOS looks for a signal from the 8" drives (which the 3.5" drives don't have) to determine whether a single-sided or double-sided disk in in the drive.  So I want to modify this code to make it not dependent on the input signal.
>

FYI

I just uploaded a bunch of bigboard stuff to http://bitsavers.org/bits/Ferguson recently