That sounds like a nice configuration. DG did use bank switching for some
of its machines (versus its official memory map design), but none officially
existed for the Nova 2 from DG. DG bank switch units were used on the CS/10
and CS/20 microNova systems but the upper 16 K words were mapped since a
couple of lower page zero locations had dedicated functions (i.e. interrupt
return address, interrupt handler addresss). Bank switching the lower 16 K
could lead to "problematic situations" when an interrupt occurred.
The Nova 2 CPU board does not contain an integrated serial port controller.
A 4010 board or 4075 board were the usual serial port adaptors for Novas.
Please contact me off-list for additional help for this interesting
configuration: bkr at
WildHareComputers.com.
Good find!
Bruce
Bruce Ray
Wild Hare Computer Systems, Inc.
bkr at
WildHareComputers.com
...preserving the Data General legacy:
www.NovasAreForever.com
----- Original Message -----
From: "Philipp Hachtmann" <hachti at hachti.de>
To: <cctalk at classiccmp.org>
Sent: Friday, September 29, 2006 10:29 AM
Subject: Data General Nova 2 users, where are you?
Hi folks,
I recently got a Data General Nova 2 CPU. It is a very late built OEM
machine (Boards say ?1973 Data General but IC timestamps tell a different
story from the time around 1977/1978).
The machine came with 80kw (!!!!!) of core memory which is two an a half
time of 32kw wich is the Nova's address space. The memory is banked by
very simple MMU which bank-switches the lower 16k. If I power the unit up
I can simply use 32kw of core. That seems to work. Have not yet worked out
how the mmu is switched. Will worry about that later...
After replacing the front panel lights I can manually read and write
memory locations. And I *think* that the CPU works. At least basically.
The machine is full of made in Germany boards made by some strange unknown
OEM company.
There is a Diablo disk drive with a diablo controller. The only function I
can see at the moment is a red led on the controller which says "ready" in
sync with the ready light on the disk drive. Drive looks good. If I try to
boot the system via the built-in dma loading routine it simply hangs in an
endless loop and nothing happens.
At the moment I would be glad to hook up some kind of "standard tty" to
the machine.
Does the Nova 2 have a standard tty port built directly into the one-PCB
cpu? That would be wonderful!
If anybody can help me with tips, tricks, software, hardware, experience
or any other interesting stuff and information - please let me know!
I don't know what to do with the machine at the moment.
I think I also could need some "standard peripherals" for the machine.
Thanks a lot!
Best wishes from Bavaria (!),
Philipp :-)