PDP-1-X - Revision history

Jnc: /* External links */ +Index Register and Micro-program Instruction Class

2025-04-07T15:55:55Z

‎External links: +Index Register and Micro-program Instruction Class

Jnc: /* See also */ +PDP-1-X microtape format

2025-04-07T14:31:01Z

‎See also: +PDP-1-X microtape format

Larsbrinkhoff: /* External links */ Add links to paper tapes and DECtapes.

2023-10-20T09:25:05Z

‎External links: Add links to paper tapes and DECtapes.

Jnc: A brief summary

2021-08-19T15:44:40Z

A brief summary

New page

The '''PDP-1-X''' was a heavily modified [[PDP-1]] created at [[MIT]]'s [[RLE]].

Notable differences are:

* the addition of operating modes to the [[Central Processing Unit|CPU]] (to support [[time-sharing]]): 'TS Off', 'TS Debug', 'Exec' (used for the [[kernel]]), and 'User';
* additional [[instruction]]s;
* the addition of an [[index register]];
* an [[input/output|I/O]] [[bus]] for connection of [[peripheral]]s.

==External links==

* [http://www.bitsavers.org/pdf/mit/rle_pdp1/ RLE PDP-1] - Original RLE PDP-1 documents
** [http://www.bitsavers.org/pdf/mit/rle_pdp1/memos/MIT_PDP-1_Memos.txt PDP-1 Timesharing System Memos]
** [http://www.bitsavers.org/pdf/mit/rle_pdp1/memos/pdp38_newInstrs_jun66.pdf Modes, Registers, New Instructions, and Traps and Interrupts in the PDP-1-X]

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[[Category: DEC Systems]]

@@ Line 18: / Line 18: @@
 ** [http://www.bitsavers.org/pdf/mit/rle_pdp1/memos/MIT_PDP-1_Memos.txt PDP-1 Timesharing System Memos]
 ** [http://www.bitsavers.org/pdf/mit/rle_pdp1/memos/pdp38_newInstrs_jun66.pdf Modes, Registers, New Instructions, and Traps and Interrupts in the PDP-1-X]
 * Machine readable copies of paper tapes and DECtapes from MIT:
 ** [http://bitsavers.org/bits/MIT/rle_pdp1x/ MIT RLE PDP1X]

@@ Line 1: / Line 1: @@
-The '''PDP-1-X''' was a heavily modified [[PDP-1]] created at [[MIT]]'s [[RLE]].
+The '''PDP-1-X''' was a heavily modified [[PDP-1]] created at [[Massachusetts Institute of Technology|MIT]]'s [[Research Laboratory of Electronics|RLE]].
 Notable differences are:
@@ Line 7: / Line 7: @@
 * the addition of an [[index register]];
 * an [[input/output|I/O]] [[bus]] for connection of [[peripheral]]s.
 ==External links==

@@ Line 13: / Line 13: @@
 ** [http://www.bitsavers.org/pdf/mit/rle_pdp1/memos/MIT_PDP-1_Memos.txt PDP-1 Timesharing System Memos]
 ** [http://www.bitsavers.org/pdf/mit/rle_pdp1/memos/pdp38_newInstrs_jun66.pdf Modes, Registers, New Instructions, and Traps and Interrupts in the PDP-1-X]
 {{semi-stub}}
 [[Category: DEC Systems]]