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FPP-12 -- The PDP-12 Floating Point Unit


FPP-12 Front View S M L XL

This is an FPP-12A, a floating point unit for the PDP-12 minicomputer. It is 32 columns of cards by 12 rows (384 card positions, although not all are occupied). (A normal FPP-12 has a 12-bit exponent and a 32-bit mantissa; the FPP-12A was upgraded to a 64-bit mantissa. The last four rows of modules were added to make the FPP-12 into an FPP-12A.)

The FPP-12 uses some "exotic" M-series cards:
CardFunction
M107(unlabeled)
M1272-2-2-3 AND NOR Gate
M13310-2 Input NAND Gates (implemented via 9 x 74H00s)
M1353 Input NAND Gate (implemented via 3 x 74H10s)
M1393-8 Input NAND Gates (implemented via 3 x 74H30s)
M155General purpose 24-pin chip carrier; effectively allows you to kludge a 24-pin chip onto the backplane, with the usual 74-series assumption about +5V and GND. Causual inspection of the FPP-12 shows them used with 74154 (4-to-16 line decoder) chips. These are at the top right of the picture.
M1722 x 9 Data Mixer
M1788 x 6 Data Mixer
M1904 bit arithmetic logic module (using a 74181)
M191(unlabeled) uses 2 x 74182
M2055 D-type Flip Flops
M238(unlabeled) uses 2 x 74193
M245General purpose 2 x 16-pin chip carrier; allows you to kludge 2 16-pin chips onto the backplane.
M611High Speed Power Inverter
M734I/O Input Bus Multiplexer

I actually have two of these; a FPP-12 in my PDP-12, and this one (an FPP-12A) in a stand-alone rack.

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