Manufacturer “S.E. Watts Electronics”
3 expansions in database
AX-RAM
Manufacturer
S.E. Watts Electronics, Australia
Date
1989
Amiga
A500
Interface
trapdoor slot, Gary socket
    Memory Expansion
  • expansion adds up to 512 kB ChipRAM and up to 2 MB FastRAM
  • sixteen DIP sockets
  • supports 256k×4 DIPs (514256)
  • accepts DIPs in groups of four giving 0.5, 1, 1.5 or 2 MB configurations
  • battery backed up clock
  • the main board connects to the trapdoor slot
  • comes with Gary adapter board GR-1, which is required for 1.75 resp. 2 MB RAM - without it, the memory expansion is limited to 512 kB
  • with Fat Agnus 8372, 512 kB memory can be used as ChipMem, resulting in 1 MB Chip memory in total - for that, the Gary adaptor board is necessary
  • supports four memory configurations:
    • 1.75 MB FastRAM (Autoconfig) + 0.25 MB RAM (AddMem)
    • 2 MB FastRAM (Autoconfig)
    • 0.5 MB ChipRAM + up to 1.5 MB FastRAM (Autoconfig) - requires soldering a wire from Gary adapter GR-1 to Jumper JP2
    • 0.5 MB ChipRAM + up to 1.5 MB FastRAM (AddMem)
Driver / Installation Disk

AX-RAM FOUR
Manufacturer
S.E. Watts Electronics, Australia
Date
1990
Amiga
A500
Interface
trapdoor slot, Gary socket
  • provides 2 or 4 MB of additional RAM
  • 4 SIMM sockets
    • takes 1 MB SIMMs in pairs
    • supports 80 or 100 ns SIMMs
    • 2 MB: socket U3 + U5 have to be occupied
  • 1 or 2 MB of the total RAM are Chip RAM, depending on the Agnus revision
  • FastRAM can be autoconfigured, or added manually via AddMem
  • installation is complicated and involves cutting traces on the Amiga motherboard and soldering wires to the GR-2 adapter board
  • RAM present in the A500 (512kB) can be utilised as FastRAM - 2 additional wires have to be soldered from the RAM chips to the AX-RAM board
  • the main board connects to the trapdoor slot
  • the adaptor board GR-2 connects to Gary's socket (Gary has to be replaced on the board)
  • disable switch, has to be connected to the AX-RAM and GR-2 board
  • battery backed up clock
  • jumper settings:
    • Main Board JP2: ON - 2M Agnus OFF - 1M Agnus
    Main Board JP3: ON - 4MB installed OFF - 2MB installed
    GR-2 J1: 1-2 - AutoConfig 2-3 - AddMem
    GR-2 J2: 1-2 - 2M Agnus 2-3 - 1M Agnus
Photos
S.E. Watts Electronics AX-RAM FOUR - Main Card front side
Main Card, front side
S.E. Watts Electronics AX-RAM FOUR - Main Card back side
Main Card, back side
S.E. Watts Electronics AX-RAM FOUR - GR-2 Adapter Board front side
GR-2 Adapter Board, front side
S.E. Watts Electronics AX-RAM FOUR - GR-2 Adapter Board back side
GR-2 Adapter Board, back side
Manual
Driver / Installation Disk

AX2000
Manufacturer
S.E. Watts Electronics, Australia
Date
1992
Amiga
A500, A2000
Interface
Agnus socket
    Memory Expansion
  • 1 MB ChipRAM expansion
  • connects to the Agnus' socket
  • Agnus is replaced with Super Agnus which allows a total of 2 MB chip RAM
Photos
S.E. Watts Electronics AX2000 - top side
top side