Difference between revisions of "BM792 ROM"
m (→Reference: +cat) |
(Add -YK, code dumps, avoid redirs) |
||
| Line 1: | Line 1: | ||
| − | The '''BM792 | + | 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 | + | 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 | + | 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== | ||
| Line 18: | Line 21: | ||
* [[UNIBUS boot ROMs]] | * [[UNIBUS boot ROMs]] | ||
| − | == | + | ==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'' | ||
Revision as of 22:44, 13 August 2019
The BM792 ROM card was the first UNIBUS ROM 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 used 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 0773000 to 0773700, so longer programs could be accomodated with multiple cards.
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-YB - TC11 DECtape and disks (RC11, RF11, RK11, RP11)
- BM792-YC - 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
- BM792-YF - DECtape and RF11 and RK11 disks
- BM792-YH - 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
External links
- Dis-assembled and commented dump of M792-YA boot ROMs
- 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
| v • d • e PDP-11 Computers and Peripherals |
|---|
| UNIBUS PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70 PDP-11/05 • PDP-11/10 • PDP-11/04 • PDP-11/34 • PDP-11/60 • PDP-11/44 • PDP-11/24 • PDP-11/84 • PDP-11/94 QBUS PDP-11s - PDP-11/03 • PDP-11/23 • PDP-11/23+ • MicroPDP-11/73 • MicroPDP-11/53 • MicroPDP-11/83 • MicroPDP-11/93 QBUS CPUs: LSI-11 • LSI-11/2 • KDF11-A • KDF11-B • KDJ11-A • KDJ11-B • KDJ11-D • KDJ11-E Buses: UNIBUS • UNIBUS map • SPC • MUD • EUB • QBUS • CD interconnect • PMI Also: PDP-11 architecture • PDP-11 Extended Instruction Set • FP11 floating point • PDP-11 Memory Management |
| UNIBUS CPUs: KA11 • KC11 • KB11-A • KB11-B • KB11-C • KB11-D • KD11-A • KD11-B • KD11-D • KD11-E • KD11-EA • KD11-K • KD11-Z • KDF11-U
Co-processors: FP11-A • FP11-B • FP11-C • FP11-E • FP11-F • KE44-A • FPF11 Chips: LSI-11 • KEV11-A • KEV11-B • KEV11-C • F-11 • KEF11-A • KTF11-A • T-11 • J-11 • FPJ11 CPU options: KE11-E • KE11-F • KJ11-A • KT11-C • KT11-D • KK11-A • KK11-B • KT24 • KTJ11-B Rare CPU options: KS11 Memory Protection and Relocation option • KT11-B Paging Option • KUV11 Writeable Control Store Front panels: KY11-A • KY11-D • KY11-J • KY11-LA • KY11-LB • KY11-P More on buses: UNIBUS and QBUS termination • Bus Arbitration on the Unibus and QBUS • CTI BUS PDT-11s - PDT-11/110 • PDT-11/130 • PDT-11/150 CTI PDP-11s - PRO-325 • PRO-350 • PRO-380 Other: FIS floating point • PDP-11 Commercial Instruction Set • PDP-11 stacks • PDP-11 family differences |
