Amiga Hardware Database - Expansion cards

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1 expansion found

Company Expert Services, USA	Date 1989	Amiga A1000

Company

Expert Services, USA

Date

1989

Amiga

A1000

allows the use of 1 MB Fat Agnus or 2 MB Big Agnus (8372B)
eight DIP sockets for 1 or 2 MB Chip RAM
1 MB Chip RAM: 8 256k×4 DIPs have to be installed
2 MB Chip RAM: 4 1M×4 DIPs occupy sockets U6, U8, U10 and U12, jumper J103 has to be set
the motherboard Chip RAM becomes true (not pseudo) Fast RAM
motherboard RAM addressing can be changed with jumpers to avoid conflicts with other internal RAM expansions - only one address supports autoconfiguring, the others require software
supports the expansion of motherboard RAM to 1 MB (piggyback hack)
Kickstart ROM socket
Kickstart source (disk or ROM) can be selected by a switch
battery backed up clock - disabled if other expansions have also a clock installed
A2000 style video slot subset (audio and parallel support missing):

compatible with the Microway AGA-2000 and Commodore A2320 flicker-fixers
if necessary, the missing signals can be fed to the video slot by connecting wires from the mainboard - the necessary eyelets are already existent and labeled

replaces the WCS daughterboard in NTSC and early PAL A1000s (later PAL A1000s have no such daughterboard, therefore they are not supported)
Agnus, Paula and Denise have to be removed, the latter two goes to the Rejuvenator
support for ECS Denise - together with Big Agnus, a full ECS chipset is present
connects to the motherboard with some of the existing WCS connections and with custom connectors to the empty custom chip sockets
no modifications are required to the motherboard, only three jumper wires have to be connected

front side

back side