Difference between revisions of "KW11-L Line Time Clock"
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| − | The '''KW11-L Line Time Clock''' is a [[UNIBUS]] [[device]] option which provides clock [[interrupt]]s at a rate of 50 or 60 Hz, driven from the [[alternating current|AC]] power provided to the [[Central Processing Unit|CPU]]'s [[power supply]]. | + | [[Image:M787-KW11-L.jpg|300px|thumb|right|KW11-L card]] |
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| + | The '''KW11-L Line Time Clock''' is a [[UNIBUS]] [[device]] option which provides a [[line time clock]], producing [[interrupt]]s at a rate of 50 or 60 Hz, driven from the [[alternating current|AC]] power provided to the [[Central Processing Unit|CPU]]'s [[power supply]]. | ||
The programming interface is extremely simple; there is one [[register]], with two [[bit]]s; one to enable interrupts, and one which is set for every clock cycle (and causes an interrupt when that happens, if the other bit is set). | The programming interface is extremely simple; there is one [[register]], with two [[bit]]s; one to enable interrupts, and one which is set for every clock cycle (and causes an interrupt when that happens, if the other bit is set). | ||
| − | Physically, | + | Physically, the original KW11-L is an [[DEC card form factor|extended-length]] single-height board ('''M787'''), which plugs into a dedicated slot in the CPU's [[backplane]]. Only the [[PDP-11/20]], [[PDP-11/40]], [[PDP-11/45]] and [[PDP-11/70]] support the original card, although later [[PDP-11]]'s generally provided a [[program compatible]] equivalent. E.g. on later UNIBUS machines (e.g. the [[PDP-11/04]] and [[PDP-11/34]]), the functionality was included in the [[DL11-W serial line unit/real-time clock option|DL11-W]]. |
| − | + | ==External links== | |
| − | + | * [http://www.bitsavers.org/pdf/dec/pdp11/1140/EK-KW11L_TM-002_KW11-L_Line_Time_Clock_Manual_Jul74.pdf KW11-L line time clock manual] (EK-KW11L-TM-002) | |
| + | * [http://www.bitsavers.org/pdf/dec/unibus/KW11-L_schem_Jul72.pdf KW11-L line time clock engineering drawings] | ||
[[Category: UNIBUS Peripherals]] | [[Category: UNIBUS Peripherals]] | ||
Latest revision as of 00:58, 8 February 2022
The KW11-L Line Time Clock is a UNIBUS device option which provides a line time clock, producing interrupts at a rate of 50 or 60 Hz, driven from the AC power provided to the CPU's power supply.
The programming interface is extremely simple; there is one register, with two bits; one to enable interrupts, and one which is set for every clock cycle (and causes an interrupt when that happens, if the other bit is set).
Physically, the original KW11-L is an extended-length single-height board (M787), which plugs into a dedicated slot in the CPU's backplane. Only the PDP-11/20, PDP-11/40, PDP-11/45 and PDP-11/70 support the original card, although later PDP-11's generally provided a program compatible equivalent. E.g. on later UNIBUS machines (e.g. the PDP-11/04 and PDP-11/34), the functionality was included in the DL11-W.
External links
- KW11-L line time clock manual (EK-KW11L-TM-002)
- KW11-L line time clock engineering drawings
