I’m sure those new cryptographic methods will work just fine. But there is one encryption scheme, known even in Turing’s time ...

CompactFlash is CMOS (not TTL), so said transceiver should be 74HC (not 74HCT) With these in mind, the IORD and IOWR signals are set up with a 2-gate delay from the address decoder (which is 74AHCT, ...