BM873 ROM - Revision history

Jnc: /* External links */ +Manual, eng drws

2021-11-19T23:02:54Z

‎External links: +Manual, eng drws

Jnc: /* External links */ link to online copy of KL8873.MEM

2021-10-15T12:30:06Z

‎External links: link to online copy of KL8873.MEM

Jnc: /* Variants */ +links, avoid redirs

2021-08-02T00:11:38Z

‎Variants: +links, avoid redirs

Jnc: typo

2021-01-28T10:24:04Z

typo

Jnc: M783 is UNIBUS transceivers; +links

2021-01-28T10:22:39Z

M783 is UNIBUS transceivers; +links

Jnc: /* Variants */ +links

2019-08-13T16:22:42Z

‎Variants: +links

Jnc: /* External links */ ROM dump

2019-08-13T13:55:03Z

‎External links: ROM dump

Jnc: Add image

2019-05-06T20:37:56Z

Add image

Jnc: /* Reference */ +cat

2018-12-07T02:22:36Z

‎Reference: +cat

Jnc: typos, minor clarifications

2016-03-28T14:38:11Z

typos, minor clarifications

@@ Line 39: / Line 39: @@
 ==External links==
 * [http://pdp-10.trailing-edge.com/BB-H311C-RM/01/swskit-documentation/kl873.mem.html KL873.MEM] - ''KL10 BM873 Bootstrap ROMs''
 * [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M873-YA.mac M873-YA.mac] - Dis-assembled and commented dump of BM873-YA boot ROMs

@@ Line 1: / Line 1: @@
 [[Image:BM873.jpg|250px|right|thumb|A BM783 card, showing the connector to the [[front panel]] cable, and diode array]]
-The '''BM873 [[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 256 [[word]]s of memory (optionally limited to 128 words), contained in four [[PROM]] [[integrated circuit|chips]] (two, when the limitation option was selected).
+The '''BM873 ROM''' card was a [[UNIBUS]] [[Read-only memory|ROM]] card for the [[PDP-11]] series of computers; it was a [[DEC card form factor|quad]] format card, and contained 256 [[word]]s of memory (optionally limited to 128 words), contained in four [[PROM]] [[integrated circuit|chips]] (two, when the limitation option was selected).
 The board appeared at [[address]]es from 773000 to 773776; if the 128-word limitation is enabled, the top address is 773376. Several of the computers it was intended for use with ([[PDP-11/40]], [[PDP-11/45]]) could be configured so that the host computer jumped to the code on the board on power-on.
@@ Line 26: / Line 26: @@
 * BM873-YB - As above, with the addition of [[RS03/04 disk drive|RS0x]] and [[RP04 disk drive|RP0x]] [[disk]]s and [[TU16 magtape drive|TU16]] tapes; in addition, booting from units other than 0 (with the unit being specified in the console switch register)
 * BM873-YC - As the -YA variant, with added support for the [[DU11 synchronous serial line interface|DU11]] synchronous line interface
-* BM873-YD - [[KL10]] 1080 front end; supported booting from, and dumping to, TC11, RP0x, and [[DTE20 Interface|DTE20 10/11 interface]]
+* BM873-YD - [[KL10]] 1080 front end; supported booting from, and dumping to, TC11, RP0x, and [[DTE20 Ten-Eleven Interface‎‎]]
 * BM873-YE - Unknown
 * BM873-YF - KL10 2040 console; same capabilities as -YD, except the [[RX11 floppy disk controller|RX11]] replaced the TC11
@@ Line 39: / Line 39: @@
 ==External links==
-* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M873-YA.mac Dis-assembled and commented dump of BM873-YA boot ROMs]
+* [http://pdp-10.trailing-edge.com/BB-H311C-RM/01/swskit-documentation/kl873.mem.html KL873.MEM] - ''KL10 BM873 Bootstrap ROMs''
 ==Reference==
 * EK-BM873-TM-004, ''BM873 restart/loader''
 [[Category: UNIBUS ROMs]]

@@ Line 23: / Line 23: @@
 ===Variants===
-* BM873-YA - Boot from disks ([[RF11]], [[RK11]], [[RP11]], [[RC11]]), [[TC11]] [[DECtape]], [[TM11]] magnetic tape, [[TA11]] casette magnetic tape, serial line, and high-speed paper tape reader
+* BM873-YA - Boot from disks ([[RF11 disk controller|RF11]], [[RK11 disk controller|RK11]], [[RP11 disk controller|RP11]], [[RC11 disk controller|RC11]]), [[TC11 DECtape controller|TC11]] [[DECtape]], [[TM11 magtape controller|TM11]] [[magnetic tape]], [[TA11 Magnetic Tape Cassette controller|TA11]] casette magnetic tape, [[PC04/PC05 High-Speed Paper-Tape Reader/Punch|PC05]] high-speed [[paper tape]] reader, and [[asynchronous serial line]]
-* BM873-YB - As above, with the addition of RS0x and RP0x disks and TU16 tapes; in addition, booting from units other than 0 (with the unit being specified in the console switch register)
+* BM873-YB - As above, with the addition of [[RS03/04 disk drive|RS0x]] and [[RP04 disk drive|RP0x]] [[disk]]s and [[TU16 magtape drive|TU16]] tapes; in addition, booting from units other than 0 (with the unit being specified in the console switch register)
-* BM873-YC - As the -YA variant, with added support for the [[DU11]] synchronous line interface
+* BM873-YC - As the -YA variant, with added support for the [[DU11 synchronous serial line interface|DU11]] synchronous line interface
 * BM873-YD - [[KL10]] 1080 front end; supported booting from, and dumping to, TC11, RP0x, and [[DTE20 Interface|DTE20 10/11 interface]]
 * BM873-YE - Unknown
-* BM873-YF - KL10 2040 console; same capabilities as -YD, except the [[RX11]] replaced the TC11
+* BM873-YF - KL10 2040 console; same capabilities as -YD, except the [[RX11 floppy disk controller|RX11]] replaced the TC11
-* BM873-YG - DN87 communications; supported booting from a [[DL11]] and the DTE20, and dumping to the latter
+* BM873-YG - DN87 communications; supported booting from a [[DL11 asynchronous serial line interface|DL11]] and the DTE20, and dumping to the latter
 * BM873-YH - 10xx/20xx console; supported booting from TC11, RX11, RP0x, and possibly the DTE20 10/11 interface (the documentation is contradictory)
 * BM873-YJ - 10xx/20xx console/communications; supported booting from TC11, RX11, RP0x, DL11 and the DTE20, and dumping to the latter

@@ Line 1: / Line 1: @@
-[[Image:BM873.jpg|250px|right|thumb|A BM783 card, showing the connector to the [[front panel]] cable]]
+[[Image:BM873.jpg|250px|right|thumb|A BM783 card, showing the connector to the [[front panel]] cable, and diode array]]
 The '''BM873 [[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 256 [[word]]s of memory (optionally limited to 128 words), contained in four [[PROM]] [[integrated circuit|chips]] (two, when the limitation option was selected).
@@ Line 19: / Line 19: @@
 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.
-In addition to an un-programmed variant, which the user could program as they wanted, the board came from DEC in several pre-programmed variants, designated BM783-Yx (where 'x' is a capital letter, starting with 'A'), set up to perform various functions. Many of the later variants were used to boot the PDP-11/40 used as the [[front-end]] processor in the [[KL10]].
+In addition to an un-programmed variant, which the user could program as they wanted, the board came from DEC in several pre-programmed variants, designated BM783-Yx (where 'x' is a capital letter, starting with 'A'), set up to perform various functions. Many of the later variants were used to boot the PDP-11/40 used as the [[front end]] processor in the [[KL10]].
 ===Variants===

@@ Line 1: / Line 1: @@
-[[Image:BM873.jpg|250px|right|thumb|An M783 card, showing the connector to the [[front panel]] cable]]
+[[Image:BM873.jpg|250px|right|thumb|A BM783 card, showing the connector to the [[front panel]] cable]]
-The '''BM873 [[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 256 words of memory (optionally limited to 128 words), contained in four [[PROM]] chips (two, when the limitation option was selected).
+The '''BM873 [[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 256 [[word]]s of memory (optionally limited to 128 words), contained in four [[PROM]] [[integrated circuit|chips]] (two, when the limitation option was selected).
-The board appeared at addresses from 773000 to 773776; if the 128-word limitation is enabled, the top address is 773376. Several of the computers it was intended for use with ([[PDP-11/40]], [[PDP-11/45]]) could be configured so that the host computer jumped to the code on the board on power-on.
+The board appeared at [[address]]es from 773000 to 773776; if the 128-word limitation is enabled, the top address is 773376. Several of the computers it was intended for use with ([[PDP-11/40]], [[PDP-11/45]]) could be configured so that the host computer jumped to the code on the board on power-on.
-In addition, an edge connector provided four external input lines, each of which (when pulled low) forced (via a simulated power-fail restart, and then forcing the first two read cyles after the power-up to read data specially provided by the board) the computer to jump to a particular address (configured by a group of 8 diodes, four groups in total - one for each input line) within the card's address space.
+In addition, an edge connector provided four external input lines, each of which (when pulled low) forced  the computer to jump to a particular address (configured by a group of 8 [[diode]]s, four groups in total - one for each input line) within the card's address space. This was done via a simulated power-fail restart, and then forcing the first two read cycles on the UNIBUS after the power-up to read data specially provided by the board.
 ==Jumpers==
-Jumpers W1 and W2 adapt the board to variations in fetching the new PS/PC after power-up - the bus cycles which the board interferes with, to force the new PC to go to a specific location within the board. Some machines, like the -11/40, fetch the PS before the PC; others, like -11/45, fetch the PC first.
+Jumpers W1 and W2 adapt the board to variations in fetching the new [[Processor Status Word|PS]]/[[Program Counter|PC]] after power-up - the bus cycles which the board interferes with, to force the new PC to go to a specific location within the board. Some machines, like the -11/40, fetch the PS before the PC; others, like -11/45, fetch the PC first.
 Jumper W3, when installed, limits the card to 128 words.
@@ Line 17: / Line 17: @@
 ==Versions==
-Most versions were used for [[bootstrapping]] the machine, from [[disk]], paper and magnetic tape, etc, but it could be used for any purpose.
+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.
-In addition to an un-programmed variant, which the user could program as they wanted, the board came from DEC in several pre-programmed variants, designated BM792-Yx (where 'x' is a capital letter, starting with 'A'), set up to perform various functions. Many of the later variants were used to boot the PDP-11/40 used as the front-end processor in the [[KL10]].
+In addition to an un-programmed variant, which the user could program as they wanted, the board came from DEC in several pre-programmed variants, designated BM783-Yx (where 'x' is a capital letter, starting with 'A'), set up to perform various functions. Many of the later variants were used to boot the PDP-11/40 used as the [[front-end]] processor in the [[KL10]].
 ===Variants===
@@ Line 26: / Line 26: @@
 * BM873-YB - As above, with the addition of RS0x and RP0x disks and TU16 tapes; in addition, booting from units other than 0 (with the unit being specified in the console switch register)
 * BM873-YC - As the -YA variant, with added support for the [[DU11]] synchronous line interface
-* BM873-YD - [[KL10]] 1080 [[front end]]; supported booting from, and dumping to, TC11, RP0x, and [[DTE20 Interface|DTE20 10/11 interface]]
+* BM873-YD - [[KL10]] 1080 front end; supported booting from, and dumping to, TC11, RP0x, and [[DTE20 Interface|DTE20 10/11 interface]]
 * BM873-YE - Unknown
-* BM873-YF - 2040 console; same capabilities as -YD, except the [[RX11]] replaced the TC11
+* BM873-YF - KL10 2040 console; same capabilities as -YD, except the [[RX11]] replaced the TC11
 * BM873-YG - DN87 communications; supported booting from a [[DL11]] and the DTE20, and dumping to the latter
 * BM873-YH - 10xx/20xx console; supported booting from TC11, RX11, RP0x, and possibly the DTE20 10/11 interface (the documentation is contradictory)
@@ Line 39: / Line 39: @@
 ==External links==
-* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M873-YA.mac Dis-assembled and commented dump of M873-YA boot ROMs]
+* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M873-YA.mac Dis-assembled and commented dump of BM873-YA boot ROMs]
 ==Reference==

← Older revision		Revision as of 13:55, 13 August 2019
Line 36:		Line 36:

	* [[UNIBUS boot ROMs]]		* [[UNIBUS boot ROMs]]
		+
		+	==External links==
		+
		+	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M873-YA.mac Dis-assembled and commented dump of M873-YA boot ROMs]

	==Reference==		==Reference==

← Older revision		Revision as of 20:37, 6 May 2019
Line 1:		Line 1:
		+	[[Image:BM873.jpg\|250px\|right\|thumb\|An M783 card, showing the connector to the [[front panel]] cable]]
		+
	The '''BM873 [[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 256 words of memory (optionally limited to 128 words), contained in four [[PROM]] chips (two, when the limitation option was selected).		The '''BM873 [[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 256 words of memory (optionally limited to 128 words), contained in four [[PROM]] chips (two, when the limitation option was selected).

← Older revision		Revision as of 02:22, 7 December 2018
Line 39:		Line 39:
	* EK-BM873-TM-004, ''BM873 restart/loader''		* EK-BM873-TM-004, ''BM873 restart/loader''
	* KL873.MEM, ''KL10 BM873 Bootstrap ROMs''		* KL873.MEM, ''KL10 BM873 Bootstrap ROMs''
		+
		+	[[Category: UNIBUS ROMs]]