Difference between revisions of "KJ11-A Stack Limit Register"
From Computer History Wiki
(finally fill this in) |
m (Better cat) |
||
| (4 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
[[Image:KJ11-A M7237.jpg|thumb|right|250px|M7235 KJ11-A card]] | [[Image:KJ11-A M7237.jpg|thumb|right|250px|M7235 KJ11-A card]] | ||
| − | The '''KJ11-A Stack Limit Register''' is option for the [[KD11-A CPU]] of the [[PDP-11/40]]. The basic KD11-A implements [[PDP-11 | + | The '''KJ11-A Stack Limit Register''' is option for the [[KD11-A CPU]] of the [[PDP-11/40]]. The basic KD11-A implements [[PDP-11 stacks#Stack limits|stack limit]] functionality, but at a fixed [[address]] (0400); installing the KJ11-A allows the address boundary to be set in a [[Central Processing Unit|CPU]] [[register]]. |
| − | Physically, the KJ11-A is an [[DEC card form factor|extended-length]] single-height | + | Physically, the KJ11-A is an [[DEC card form factor|extended-length]] single-height board ('''M7237'''), which plugs into a dedicated slot in the CPU's [[backplane]]. |
| − | + | ==External links== | |
| − | [[Category: PDP-11 Processors]] | + | * [http://www.bitsavers.org/pdf/dec/pdp11/1140/DEC-11-HKDAA-A-D_KD11-A_Processor_Manual.pdf KD11-A processor manual] (DEC-11-HKDAA-A-D) - Section 7.2 "KJ11-A Stack Limit Register"; pp. 7-3 - 7-11 (pp. 213-221 of the PDF) |
| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings] (pp. 109-113 of the PDF) | ||
| + | |||
| + | [[Category: PDP-11 UNIBUS Processors]] | ||
Latest revision as of 01:35, 12 October 2022
The KJ11-A Stack Limit Register is option for the KD11-A CPU of the PDP-11/40. The basic KD11-A implements stack limit functionality, but at a fixed address (0400); installing the KJ11-A allows the address boundary to be set in a CPU register.
Physically, the KJ11-A is an extended-length single-height board (M7237), which plugs into a dedicated slot in the CPU's backplane.
External links
- KD11-A processor manual (DEC-11-HKDAA-A-D) - Section 7.2 "KJ11-A Stack Limit Register"; pp. 7-3 - 7-11 (pp. 213-221 of the PDF)
- PDP-11/40 system engineering drawings (pp. 109-113 of the PDF)
