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