provides up to 3.5 MByte FastRAM and 512 kByte ChipRAM
memory board provides 32 DIP sockets
supports 256k×4 (414256), <150 ns DIPs
accepts DIPs in groups of four giving 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4 MB configurations
when installing RAM, the chips have to be installed starting from bank 1 up to bank 8 - the specific sockets (U3 - U34) for each bank are mentioned in the manual
supports Fat Agnus and Fatter Agnus (ECS Agnus) - each needs a specific PAL chip in socket U3 on the CPU board ('468' marking - Fat Agnus, '4468' marking - Fatter Agnus)
only 1.5 MB or 2 MB RAM is autoconfigured (depending on Agnus revision), the remaining memory needs to be added via AddTrap utility
compatible with Kickstart 1.2, here only 512 kByte ChipRAM is autoconfigured (bank 1) - as with Kickstart ≥1.3, the remaining memory needs to be added via AddTrap utility
no disable switch
battery backed up clock
solderless installation
the memory board connects to the trapdoor slot
the adapter board connects to 68000 CPU socket, the CPU is replaced onto the board
both boards are interconnected with a 38cm ribbon cable, allowing upgrading the RAM board without dissassembly of the Amiga
current consumption <400mA
Memory Board Switch Settings
Switch
Setting
1
ON - enables specific memory banks for Fat Agnus (banks 4 - 8) and Fatter Agnus (banks 5 - 8) OFF - no memory installed
2
ON - enables specific memory banks for Fat Agnus (banks 1 - 3) and Fatter Agnus (banks 2 - 4) OFF - no memory installed
consists of two parts: an interface module which plugs into the side expansion port, and the hard disk housing which is connected via multiple cables fed through the back side of the interface module
A1000/A500 Interface Module
serves as a host for a 62 pin ST412/506 controller card
compatible controllers:
OMTI 5520 (MFM)
OMTI 5527 (RLL)
DTC-5150 X (MFM)
DTC-5160 CRH (RLL)
supports RLL and MFM, depending on controller card
works only with hard disks with OMTI or DTC controller
features a passthrough connector for the side expansion port
optional autoboot daughterboard (stdisk.device in ROM)
cannot load data into the RAM of 32 bit accelerators
if used together with a Spirit Inboard, the RAM has to be set to not autoconfig in order to avoid boot problems
the interface module is designed for the A1000 - to use it with the A500, an adapter PCB is needed
A500 Interface Module
later released A500 specific variant with same electronics
does not fit the A1000
mounting space for a 3½" hard disk inside the module, but can also be used with the additional hard disk module
Hard disk module
mounting space for a 5¼" hard disk
integrated power supply, powers both hard disk and the interface
accepts DIPs in groups of 16 giving 0.5, 1 or 1.5 MB configurations
banks have to be filled beginning from bank 0
connects into the 68000 socket
the 68000 is replaced onto the board
battery backed-up clock
two clips have to be connected to the DPALEN (A1000 NTSC version) resp. PALEN (international version) PAL chip to provide the OVR* and *XRDY signals to the expansion
does not really autoconfig its memory - it recognizes the installed amount, but places the memory outside of the autoconfig space
Jumper Settings
JP1-JP3 OFF: 1.5 MB with Autoconfig (banks 012)
JP1-JP2 OFF, JP3 ON: 1.0 MB with Autoconfig (banks 01)
JP1 OFF, JP2-JP3 ON: 0.5 MB with Autoconfig (bank 0)
JP1-JP3 ON: no Autoconfig (memory has to be added with AddMem)