KA780 CPU

The KA780 CPU was the CPU for the VAX-11/780.

It was implemented with a large group of hex cards:

Slot	Board	Acronym	Function
29	M8236	CIB	Console Interface Board
23	M8235	USC	Microsequencer
22	M8234	PCS	PROM Control Store
20	M8233 or M8238	WCS	Writeable Control Store
18	M8233 or M8238	OCS	Optional Control Store
16	M8232	CLK	Processor Clock
15	M8231	ICL	Interrupt Control
14	M8230	CEH	Condition Codes/Exceptions
13	M8229	DAP	Data Path
12	M8228	DCP	Data Path
11	M8227	DDP	Data Path
10	M8226	DEP	Data Path
9	M8225	DBP	Data Path
8	M8224	IRC	Instruction Decode
7	M8223	IDP	Instruction Buffer
6	M8222	TBM	Translation Buffer
5	M8221	COM	Cache Data
4	M8220	CAM	Cache Address
3	M8219	SBH	SBI High Bits Interface
2	M8218	SBL	SBI Low Bits Interface
1	M8237	TRS	SBI Terminator and Silo

External links

• KA780 Central Processor Technical Description (EK-KA780-TD-001)
• KA780 Field Maintenance Print Set (MP-00496)