BM792 ROM - Revision history

Jnc: +img, links, ext links

2021-12-04T18:05:55Z

+img, links, ext links

Jnc: /* Variants */ two missing variants

2020-03-15T17:26:47Z

‎Variants: two missing variants

Jnc: Add -YK, code dumps, avoid redirs

2019-08-13T21:44:45Z

Add -YK, code dumps, avoid redirs

Jnc: /* Reference */ +cat

2018-12-07T02:13:52Z

‎Reference: +cat

Jnc: ref SPC slot

2016-06-16T10:17:45Z

ref SPC slot

Jnc: +See also

2016-03-26T18:11:35Z

+See also

Jnc: typo

2016-03-20T12:45:05Z

typo

Jnc: Fairly comprehensive

2016-03-20T03:24:29Z

Fairly comprehensive

New page

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

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 7737000, 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 ROM''' card was the first [[UNIBUS]] [[Read-only memory|ROM]] card for the [[PDP-11]] series of computers; it contained only 32 [[word]]s 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 [[bootstrap]]ping the machine, from [[disk]], [[paper tape|paper]] and [[magnetic tape]], etc, but it could be used for any purpose
@@ Line 7: / Line 9: @@
 ==Variants==
-* BM792-YA - [[Asynchronous serial line|Serial line]], high-speed [[paper tape]] reader
+* BM792-YA - [[Asynchronous serial line|Serial line]] ([[KL11 asynchronous serial line interface|KL11]]/[[DL11 asynchronous serial line interface|DL11]]), high-speed [[paper tape]] reader ([[PC11 High-Speed Paper-Tape Reader/Punch Control|PC11]])
 * BM792-YB - [[TC11 DECtape controller|TC11]] [[DECtape]] and disks ([[RC11 disk controller|RC11]], [[RF11 disk controller|RF11]], [[RK11 disk controller|RK11]], [[RP11 disk controller|RP11]])
 * BM792-YC - [[CR11 Card Readers|CR11]] [[punched 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 magtape controller|TM11]] magnetic tape
+* 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 magtape controller|TM11]] [[magnetic tape]]
 * BM792-YF - DECtape and RF11 and RK11 disks
 * BM792-YH - [[TA11 Magnetic Tape Cassette controller|TA11]] casette magnetic tape
 * BM792-YJ - Special TM11 loader
 * BM792-YK - Special version for the [[VT20]], using its second serial line
-* BM792-YL - [[RX11 floppy disk controller|RX11]] floppy disk controller
+* BM792-YL - [[RX11 floppy disk controller|RX11]] [[floppy disk]] controller
 Note that there are two variants of the -YA (see the link below).
@@ Line 25: / Line 27: @@
 ==External links==
 * [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M792-YA.mac Dis-assembled and commented dump of M792-YA boot ROMs]
 * [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M792-YK.mac Dis-assembled and commented dump of M792-YK boot ROMs]
 [[Category: UNIBUS ROMs]]

@@ Line 7: / Line 7: @@
 ==Variants==
-* BM792-YA - [[Asynchronous serial line|Serial line]], high-speed paper tape reader
+* BM792-YA - [[Asynchronous serial line|Serial line]], high-speed [[paper tape]] reader
 * BM792-YB - [[TC11 DECtape controller|TC11]] [[DECtape]] and disks ([[RC11 disk controller|RC11]], [[RF11 disk controller|RF11]], [[RK11 disk controller|RK11]], [[RP11 disk controller|RP11]])
 * BM792-YC - [[CR11 Card Readers|CR11]] [[punched card]] reader
@@ Line 13: / Line 13: @@
 * BM792-YF - DECtape and RF11 and RK11 disks
 * BM792-YH - [[TA11 Magnetic Tape Cassette controller|TA11]] casette magnetic tape
 * BM792-YK - Special version for the [[VT20]], using its second serial line
 Note that there are two variants of the -YA (see the link below).

@@ Line 1: / Line 1: @@
-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
+The '''BM792 ROM''' card was the first [[UNIBUS]] [[Read-only memory|ROM]] card for the [[PDP-11]] series of computers; it contained only 32 [[word]]s 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 [[bootstrap]]ping the machine, from [[disk]], [[paper tape|paper]] and [[magnetic tape]], etc, but it could be used 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.
+It used individual [[diode]]s in an array to represent individual [[bit]]s; if the diode was present, the bit contained a '1'; if the diode was not present, a '0'. [[Jumper]]s allowed the board to occupy any 32-word block from 0773000 to 0773700, 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.
+The board came in two main variants: the M792 came fully populated with diodes, and the user removed diodes (either by de-soldering them, or clipping their leads) to produce the desired [[program]]; other variants, designated M792-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-YA - [[Asynchronous serial line|Serial line]], high-speed paper tape reader
-* BM792-YB - [[TC11]] [[DECtape]] and disks ([[RC11]], [[RF11]], [[RK11]], [[RP11]])
+* BM792-YB - [[TC11 DECtape controller|TC11]] [[DECtape]] and disks ([[RC11 disk controller|RC11]], [[RF11 disk controller|RF11]], [[RK11 disk controller|RK11]], [[RP11 disk controller|RP11]])
-* BM792-YC - Card reader
+* BM792-YC - [[CR11 Card Readers|CR11]] [[punched 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
+* 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 magtape controller|TM11]] magnetic tape
 * BM792-YF - DECtape and RF11 and RK11 disks
-* BM792-YH - [[TA11]] casette magnetic tape
+* BM792-YH - [[TA11 Magnetic Tape Cassette controller|TA11]] casette magnetic tape
 ==See also==
@@ Line 18: / Line 21: @@
 * [[UNIBUS boot ROMs]]
-==Reference==
+==External links==
 * DEC-11-HBMAA-E-D, ''BM792 read-only-memory and MR11-DB bootstrap loader''

← Older revision		Revision as of 02:13, 7 December 2018
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	{{PDP-11}}		{{PDP-11}}
		+
		+	[[Category: UNIBUS ROMs]]

@@ 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''