Old Apple ][ expansion cards

Apple II RTC with sideways RAM.png

Namal RTC.jpg

This Apple ][ expansion card also had 4k of onboard ROM (2732) which could be accessed using a sideways memory techneque.

Despite its advanced capabilities, the Super Clock 1 was not widely known—likely due to its limited production and targeted industrial clients. It stands today as a significant historical artifact reflecting:

• British engineering innovation in American hardware ecosystems,

• The evolution of custom Apple II peripherals in the early 1980s,

• A rare example of firmware-integrated sideways RAM in Apple II hardware.

This board demonstrated early hybrid memory design on the Apple II, allowing dynamic memory paging outside Apple’s standard architecture. It's one of the only known Apple II peripherals to use Sideways ROM/RAM model—and to successfully integrate them with real-time timing logic. Its potential applications ranged from computing environments to NATO Maintenance and Supply Agency operations in Luxembourg

One of a couple of expansion cards designed by David N Anderson, Cambridge, England in 1982 for Namal Electronics.

Other cards were Serial card that supported RS232 and 20mA loop and parallel expansion card supporting parallel print (centronics) and could be used for general control.