21 Feb
2012
21 Feb
'12
5 p.m.
On 02/21/2012 07:50 PM, Kelly D. Leavitt wrote:
No, it only has 4 40 pin dips. Where did FIS come from?
Not the FIS, but the LSI-11 chipset itself, either four or five
chips. It's the WD Pascal MicroEngine chipset, with its microcode
rewritten to execute the PDP-11 instruction set.
The fifth 40-pin DIP is the FIS option microcode ROM, which gives you
floating-point instructions implemented in microcode.
I also have the M7264 quad wide 11/03 (thanks Glen)
Very nice! I love those. Does it have the FIS option?
(the fifth 40-pin DIP)
You know what that chipset is, right? I mean where it
came from originally? There are no ROMS on the M9400-YE. It seems to have 3
buffers or
terminators (16 pin or 14 pin dips), a couple of resistors, and two
header sockets. I think these used to go to a board in the 780 and they
loaded boot code from there. This might be my biggest problem here.
Ok. I've never "de-11/780d" an 11/780 console 11/03; I will see if I
can find some info about it. We should just replace that board with a
BDV11. I have a bunch of those and can, as the cool kids say, "hook you
up".
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA