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...ribed functionality is equivalent to ''five'' 74xx ICs. (74377, ½ 74139, ½ 7420, ½ 74244, 7432)

=== Using 7420 === ...emory, also using the /WE priority method. If this is done with a two gate 7420, the second gate could be used to invert r/w to prevent bus conflicts as in

FB-N-128-02 | 0 | PRG 2x16k | 7420 | Family BASIC | [http://bootgod.dyndns.o

...tes an MMC4 from an MMC2 with the help of a [[7402]] quad-NOR gate and a [[7420]] 4-input NAND gate to [[PRG RAM circuit|decode PRG RAM]].