DEC DOC LESS

From: Allison J Parent <allisonp_at_world.std.com>
Date: Thu Aug 21 15:15:12 1997

<find enough boards to get an H-11 up and running.
<I was wondering if any of the DEC experts out
<there could identify the purpose for any of these
<boards.(Names come from whats written on each board)
<They all appear to be Q bus.
<
< M7940 or M7946 RXV11 LSI 11 Interface (Half width)

RX01 floppy controller for q-bus (includes h-11). You
would need the RX01 disk sustem to match it.


< M8340 Decoder and Step Counter (Full width)
< M8341 Multiplexers and Timing Generator (Full width)
<
< These two boards are linked togather with a
<connector across the top of the boards.

KE-8E extended arithmetic element for PDP-8E

< M8639 RDRX Disk Controller (Full width)

AKA RQDX2, this is a Qbus (also h-11)hard disk and floppy controller that
supports st506,st412,st225, st251,q540 and RX53(1325) mfm hard disks and
RX50 dec floppy. It's connector goes via a50 pin cable to a M9058 signal
distribuition board and from there to the disks.

The rx50 is a double density single sided 96tpi drive unique to DEC. The
storage is about 409k per spindle (there are two). It is the only floppy
that the RQDX firmwhere knows. You may be able to fake it into using one
side of a 1.2m 5.25 floppy strapped to spin at 300rpm.

< M7957 Asyn Mux (Full width)

Qbus DZV-11 multi port serial IO.

< M4002 ? (Half width)

Qbus KW-11c programmable real time clock.

< M8189 KDF 11-B (Full width)

PDP-11/23B ++++ while this may work in a H11 box it will nto support q22
unless the backplane has had the lines wired in (h-11 was Q-16).

This is the most common Q-22 (Qbus 22bit addressing) PDP-11 cpu and is a
good performer. It has two DL compatable serial ports (console and user)
along with a generic boot and ODT console.

The standard chip complment is the CPU (two surfacemount chips on it) and
MMU. Optional were the CIS Commercial Instruction Set, FIS floating point
Instruction Set and the FPP-11 that implments the FIS-11 in hardware.

< M8043 ? (Half width)

Q-bus DLV-11j 4 DL serial ports on one card.

< I have the processor board covered. I have about half
<a dozen M7264 LSI-11 processor boards.

Basic LSI-11/2

< But, I could also use a list of commands for the resident
<monitor. Damn, I can't even remember what it's called.

ODT, they are fairly simple:

_at_00000G <start execution at 00000

_at_00000/ 12345 <display contents of location (00000)

the linefeed key will cause the next location to be opend and the contents
displayed

_at_00000/ 12345 <lf>
_at_00001/ 02010 <cr>
_at_

Entering data....

_at_00000/ 12345 001040 open a location, it's contents are displayed, enter
                        new contents, CR to close or LF key to advance to
                        next.

_at_P when typed at the @ (monitor prompt) the cpu will continue execution
    at the current address (assuming there were no errors to cause a
    monitor trap).

$ or R Open a register for display or change.

$S or RS opens the processor status register.

This should help.

Allison
Received on Thu Aug 21 1997 - 15:15:12 BST

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