Difference between revisions of "KEF11-A floating point chip"

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The '''KEF11-A floating point chip''' is an optional chip for [[KDF11 CPUs|PDP-11 CPUs]] which use the [[F-11 chip set]]. It implemented the [[FP11 floating point|FP11]]-compatible [[floating point]].
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[[Image:KEF11-A.jpg|thumb|right|250px|KEF11-A chip installed]]
  
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The KEF11-A requires the [[KTJ11-A memory management chip]], since the floating point registers are actually in the KTJ11-A (probably because the KEF11-A is microcode, and there aren't enough pins for both the data bus, and the microcode bus).
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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]].
  
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The KEF11-A is another dual carrier (with the chips being DEC part # 23-002C7-Ax and DEC part # 23-003C7-Ax; only the A revision of both has been seen).
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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).
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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).
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==Further reading==
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* ''11/23 Floating Point Compatibility'', [[MicroNote]] #066
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[[Category: PDP-11 Processors]]

Latest revision as of 15:42, 25 July 2024

KEF11-A chip installed

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 on it are DEC part numbers 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
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