4 Dec
2014
4 Dec
'14
3:03 a.m.
On 2014-12-04 08:25, Lars Brinkhoff wrote:
Pontus <pontus at update.uu.se> writes:
As far as I can recall, the TOAD-1 is not compatible with the KL10B. I
don't remember what the differences were, but I understood that TOPS-20
had to be modified in an incompatible way to run on it. Which was
unfortunate, in that SC also made extensions, but they were more in line
with how the KL10B works. So we got two different branches when the
architecture was expanded from the KL10B. Unfortunately I don't remember
if it was the paging system or the I/O system where they diverged.
Someone who knows more details who can correct me on this?
Johnny
Perhaps you could elaborate on the compatibility
between the TOAD
versions and other PDP-10 processors. Also what operating systems do
they run, both previous and current versions?
I'll contribute the technical information I have. Happy to take
corrections or additions!
The TOAD-1 was XKL's first PDP-10 clone, created around 1994.
The CPU is called XKL-1, and is a model B with an extended virtual (30
bits) and physical address (33 bits) space compared to the KL10 model
B. It's clocked at 33 MHz, and has 128K of cache and 8K TLB entries.
The microcode control store has 8K 128-bit words.
Similar information for more 10s here:
http://pdp10.nocrew.org/cpu/processors.html