View source for KEF11-A floating point chip

[[Image:KEF11-A.jpg|thumb|right|250px|KEF11-A chip installed]]

The '''KEF11-A floating point chip''' is an optional [[integrated circuit|chip]] for [[KDF11 CPUs|PDP-11 CPUs]] which use the [[F-11 chip set]]. It contains [[microcode]] to implement the [[FP11 floating point|FP11]]-compatible [[floating point]].

The KEF11-A requires the [[KTF11-A memory management chip]], since the floating point [[register]]s are actually in the KTF11-A (the reason why is unknown; although the KEF11-A is microcode, there are enough pins for both the data [[bus]], and the microcode bus).

The KEF11-A is another dual carrier: the chips on it are [[DEC part number]]s 23-002C7-AA and 23-003C7-AA (only the A revision of both has been seen). The entire carrier is DEC part # 57-00001-01-A1 (although 57-00001-00 is occasionally seen - but with the same chip versions as the -01).

==Further reading==
	
* ''11/23 Floating Point Compatibility'', [[MicroNote]] #066

[[Category: PDP-11 Processors]]