BM792 ROM - Revision history

Jnc: +img, links, ext links

2021-12-04T18:05:55Z

+img, links, ext links

← Older revision		Revision as of 18:05, 4 December 2021
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			[[Image:BM792-YA.jpg\|300px\|thumb\|right\|M792-YA card]]

	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		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

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	==Variants==		==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-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		* 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-YF - DECtape and RF11 and RK11 disks
	* BM792-YH - [[TA11 Magnetic Tape Cassette controller\|TA11]] casette magnetic tape		* BM792-YH - [[TA11 Magnetic Tape Cassette controller\|TA11]] casette magnetic tape
	* BM792-YJ - Special TM11 loader		* BM792-YJ - Special TM11 loader
	* BM792-YK - Special version for the [[VT20]], using its second serial line		* 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).		Note that there are two variants of the -YA (see the link below).
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	==External links==		==External links==

			* [http://www.bitsavers.org/pdf/dec/unibus/DEC-11-HBMAA-E-D_BM792_Read-only-memory_and_MR11-DB_Bootstrap_Loader_Jan75.pdf BM792 read-only-memory and MR11-DB bootstrap loader] (DEC-11-HBMAA-E-D)
			* [http://www.bitsavers.org/pdf/dec/unibus/MR11-DB_64_Word_Bootstrap_M792_May72.pdf MR11-DB bulk storage bootstrap loader engineering drawings]
	* [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-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]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M792-YK.mac Dis-assembled and commented dump of M792-YK boot ROMs]

	~~==Further reading==~~

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

	~~{{PDP-11}}~~

	[[Category: UNIBUS ROMs]]		[[Category: UNIBUS ROMs]]

Jnc: /* Variants */ two missing variants

2020-03-15T17:26:47Z

Variants: two missing variants

← Older revision		Revision as of 17:26, 15 March 2020
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	==Variants==		==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-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		* BM792-YC - [[CR11 Card Readers\|CR11]] [[punched card]] reader
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	* BM792-YF - DECtape and RF11 and RK11 disks		* BM792-YF - DECtape and RF11 and RK11 disks
	* BM792-YH - [[TA11 Magnetic Tape Cassette controller\|TA11]] casette magnetic tape		* 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-YK - Special version for the [[VT20]], using its second serial line
			* BM792-YL - [[RX11 floppy disk controller\|RX11]] floppy disk controller

	Note that there are two variants of the -YA (see the link below).		Note that there are two variants of the -YA (see the link below).

Jnc: Add -YK, code dumps, avoid redirs

2019-08-13T21:44:45Z

Add -YK, code dumps, avoid redirs

← Older revision		Revision as of 21:44, 13 August 2019
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	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==		==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-YF - DECtape and RF11 and RK11 disks
	* BM792-YH - [[TA11]] casette magnetic tape		* 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).

	==See also==		==See also==
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	* [[UNIBUS boot ROMs]]		* [[UNIBUS boot ROMs]]

	==~~Reference~~==		==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]

			==Further reading==

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

Jnc: /* Reference */ +cat

2018-12-07T02:13:52Z

Reference: +cat

← Older revision		Revision as of 02:13, 7 December 2018
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	{{PDP-11}}		{{PDP-11}}

			[[Category: UNIBUS ROMs]]

Jnc: ref SPC slot

2016-06-16T10:17:45Z

ref SPC slot

← Older revision		Revision as of 10:17, 16 June 2016
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	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.		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.
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	* DEC-11-HBMAA-E-D, ''BM792 read-only-memory and MR11-DB bootstrap loader''		* DEC-11-HBMAA-E-D, ''BM792 read-only-memory and MR11-DB bootstrap loader''

			{{PDP-11}}

Jnc: +See also

2016-03-26T18:11:35Z

+See also

← Older revision		Revision as of 18:11, 26 March 2016
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	* BM792-YF - DECtape and RF11 and RK11 disks		* BM792-YF - DECtape and RF11 and RK11 disks
	* BM792-YH - [[TA11]] casette magnetic tape		* BM792-YH - [[TA11]] casette magnetic tape

			==See also==

			* [[UNIBUS boot ROMs]]

	==Reference==		==Reference==

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

Jnc: typo

2016-03-20T12:45:05Z

typo

← Older revision		Revision as of 12:45, 20 March 2016
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	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 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.		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.

	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 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.

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''