ICD AdRAM 540 & 560 - Amiga Hardware Database

Company ICD, USA	Date 1990	Amiga A500	Interface trapdoor slot, Gary socket

Company

ICD, USA

Date

1990

Amiga

A500

Interface

trapdoor slot, Gary socket

32 DIP sockets accept 4 MB RAM (AdRAM 540)
supports 256k×4 (414256), 70 - 120 ns DIPs
accepts DIPs in groups of four giving 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4 MB configurations
expandable to 6 MB with the optional AdRAM 560 board
only 4 MB of 6 is continuous
only 2.5 MB RAM is autoconfigured
the 1.5 MB option does not work properly with Kickstart 1.2 when the RAM chips are installed in the first three banks
- install one megabyte in the first two blocks (those get automatically recognized) and install the rest of the chips in one of the last four blocks (those will be recognized by the AdRAM program)
no disable switch
battery backed up clock
the RAM board connects to the trapdoor slot
the adapter board connects to Gary's socket - if 1 MB Chip RAM is present, a wire has to be soldered between the adaptor and the motherboard