Difference between revisions of "BM792 ROM"

Revision as of 11:17, 16 June 2016

The BM792 ROM card was a UNIBUS card for the PDP-11 series of computers; it contained only 32 words of memory. It was a quad format card, and used an SPC slot. Most versions were used for bootstrapping the machine, from disk, paper and magnetic tape, etc, but it could be use for any purpose

It used individual diodes in an array to represent individual bits; if the diode was present, the bit contained a '1'; if the diode was not present, a '0'. Jumpers allowed the board to occupy any 32-word block from 773000 to 773700, so longer programs could be accomodated with multiple cards.

The board came in two main variants: the BM792 came fully populated with diodes, and the user removed diodes (either by desoldering them, or clipping their leads) to produce the desired program; other variants, designated BM792-Yx (where 'x' is a capital letter, starting with 'A') came pre-programmed from DEC to perform various functions.

Variants

BM792-YA - Serial line, high-speed paper tape reader
BM792-YB - TC11 DECtape and disks (RC11, RF11, RK11, RP11)
BM792-YC - Card reader
MR11-DB - A two board set, consisting of the BM792-YD and -YE, it supported the same devices as the -YB, with the addition of the TM11 magnetic tape
BM792-YF - DECtape and RF11 and RK11 disks
BM792-YH - TA11 casette magnetic tape

Reference

DEC-11-HBMAA-E-D, BM792 read-only-memory and MR11-DB bootstrap loader

@@ Line 1: / Line 1: @@
-The '''BM792 [[Read-only memory|ROM]]''' card was a [[UNIBUS]] card for the [[PDP-11]] series of computers; it was a [[DEC card form factor|quad]] format card, and contained only 32 words of memory. Most versions were used for [[bootstrapping]] the machine, from [[disk]], paper and magnetic tape, etc, but it could be use for any purpose
+The '''BM792 [[Read-only memory|ROM]]''' card was a [[UNIBUS]] card for the [[PDP-11]] series of computers; it contained only 32 words of memory. It was a [[DEC card form factor|quad]] format card, and used an [[Small Peripheral Controller|SPC]] slot. Most versions were used for [[bootstrapping]] the machine, from [[disk]], paper and magnetic tape, etc, but it could be use for any purpose
 It used individual [[diode]]s in an array to represent individual bits; if the diode was present, the bit contained a '1'; if the diode was not present, a '0'. Jumpers allowed the board to occupy any 32-word block from 773000 to 773700, so longer programs could be accomodated with multiple cards.
@@ Line 21: / Line 21: @@
 * DEC-11-HBMAA-E-D, ''BM792 read-only-memory and MR11-DB bootstrap loader''
+{{PDP-11}}

Difference between revisions of "BM792 ROM"

Revision as of 11:17, 16 June 2016

Variants

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Reference

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