Low noise replacement 74AHCT16245 maybe useful?

[mkl]

Some considerations - perhaps improving stability?
74AC16245 (not 74ACT16245) has Minimum input high voltage 3.85V when VCC=5.5V (3.15V when VCC=4.5)
Most (not all) 5 volt IC:s drive over that 3.85 volts, but sometimes there are 3.3 volt chips on amiga data bus - so a "T" version seems safer?
Also, 74AHCT16245 has lower noise output switching, and driving current lower (8mA figure instead of 24mA of AC/ACT)

And also, floating cmos inputs generate noise by drawing current from Vcc (inputs are consuming power then), so I would solder pull-up resistor packs on A500 boards, where there are unused pads for these - rev 6 onwards, but not seen on rev 5 A500 mainboard.