Difference between revisions of "KEF11-A floating point chip"
From Computer History Wiki
(Correct supposition on float registers in MMU chip) |
m (typo) |
||
| Line 1: | Line 1: | ||
| − | The '''KEF11-A floating point chip''' is an optional chip for [[KDF11 CPUs|PDP-11 CPUs]] which use the [[F-11 chip set]]. It contains [[microcode]] | + | 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 | + | 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 being DEC part # 23-002C7-AA and DEC part # 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). | The KEF11-A is another dual carrier: the chips being DEC part # 23-002C7-AA and DEC part # 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). | ||
[[Category: PDP-11 Processors]] | [[Category: PDP-11 Processors]] | ||
Revision as of 04:53, 18 November 2018
The KEF11-A floating point chip is an optional chip for PDP-11 CPUs which use the F-11 chip set. It contains microcode to implement the FP11-compatible floating point.
The KEF11-A requires the KTF11-A memory management chip, since the floating point registers 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 being DEC part # 23-002C7-AA and DEC part # 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).
