2 Aug
2000
2 Aug
'00
11:19 a.m.
At 03:50 PM 8/2/00 -0700, Ethan wrote:
It does kinda matter which way you are going (i.e.,
Unibus or Q-bus CPU)...
mostly because the Unibus is 18-bit and the Q-bus is 18 or 22 bit (or 16 ;-)
with completely different ideas about how to map space (which matters at
the driver level, not the hardware level).
This apparently can go both ways. There is configuration information on
mapping the Q-bus into the Unibus address space for Unibus CPUs and details
on how to run it the other way for Q-bus CPUs to access Unibus peripherals.
But, like I mentioned I can't seem to find the Q-bus side in the pile yet.
Fortunately I got the docs so if one shows up I would recognize it!
It [11/750] sits, temporarily unloved, until I can
wire a 30A
Hubble receptacle for it.
A VAX is a terrible thing to waste :-) Buried in the bottom of a 19" rack
with literally leaves on top and spiderwebs inside was a VLC with 16MB of
memory and an RZ23L inside. I cleaned it up, powered it up, and booted the
disk. VMS 6.0 booted happy as a clam! These things are becoming my favorite
little VAX, they are small, seem to be indestructible, support cheap SCSI
disks and are much faster than a MicroVAX 2000 or a MVII.
If not, please let me know. I have an 8300.
Will do.
--Chuck