On Sun, 23 Jul 2017, Jason T via cctalk wrote:
Searching the depths of the basement collection, I ran across a 15-odd
year-old acquisition, the Apple Turnover board by Vertex Systems.
It's an ISA card from the IBM PC/XT era that fits between the floppy
controller and floppy drive, allowing the PC to read Apple // DOS and
Apple CP/M formatted disks. Having some friends over and an XT handy,
we tested it out with both formats and made it do its thing, mostly
successfully.
There were many things wrong with the hardware, low-level (sector
read/write) code (Ron Jones?), and the high level file-system code (the
part that I did).
The later release that also included ProDos and "Apple Pascal/P-System"
fixed some of those, but far from all.
It really needed at least two more iterations.
You will find that some drives, such as the TM100, work better with it
than others, such as Teac.
My lawyer closed Vertex down.
Note: There are other, unrelated companies that also have a "Vertex" in
their names.
--
Grumpy Ol' Fred [email protected]
