25 Nov
2013
25 Nov
'13
2:19 p.m.
On Mon, 25 Nov 2013, Al Kossow wrote:
On 11/25/13 9:28 AM, Steven Hirsch wrote:
That be the one - exactly the same as my unit.
On Mon, 18 Nov 2013, Al Kossow wrote:
foo. I'll check mine again.
does your kb look like the one under The Corvus kb doesn't have hardware lock.
Unfortunately, my system does require a mechanical lock. I suppose it flew apart when I cleaned it, and
didn't notice. Now I have to
find some sacrificial
Keytronics kb to fix it.
If you find such a thing, I'd love to know the specifics.
On the subject of Corvus, I have an interface called a "Buffered Floppy
Controller" and what appears to be an 80-track 5.25" DD drive attached.
Do you have one of these? If so, how do you get the OS to recognize it?
It tries to access the unit but cannot recognize the one 5.25" system
diskette I have.
ImageDisk tells me it's 9 x 512 byte/sector, 80-tracks, DS and 300Kbps
data rate (a function of the Teac HD drive I'm using - probably 250Kbps in
real life). This correlates with a number of the images on Bitsavers
(from Eric Smith?).
I cannot find any documentation on this particular floppy peripheral. The
unit is working fine from the 8" SSSD drive and fortunately the lion's
share of my diskettes are in that format. It also can read Apple 2 GCR
encoded diskettes by plugging an Apple controller and drive in.
I'm getting the impression that the "Buffered Floppy" device was
introduced late in the Concept's lifetime and perhaps needs new firmware
or device drivers.
My Concept was very nicely modified to have 1.25 M of memory. Never seen
any others with this work. One bank of 64k DRAM was replaced with stacked
sockets, bent-out pins for high address line and 256k DRAM installed.
Steve
--