ZIDEFS is a replacement filing system for the ICS IDE interface.

Features :

    Fully replaces (and considerably improves on) the standard filing system and support software supplied with the 'old' Ian Copestake Software (ICS) 16-bit IDE interface from circa 1991.
    Extends compatibility all the way up to Risc PCs running RISC OS 4.
    Provides optimal transfer speeds and improved harddisc compatibility.
    Supports up to four partitions and very large (up to 256 GB) drives. 

Note that ZIDEFS must be 'blown' into an EPROM, which replaces the existing EPROM on the IDE card.

ZIDEFS is Freeware.

A few alternative builds of the ROM are available below. They support other IDE interfaces or filing system identities. Interface numbers 0, 3 and 4 are ICS, Ian Stocks 8-bit and Castle A30x0 respectively. Filing system name/number/SWI base choices are IDEFS/49/0x41FC0, SIDEFS/155/0x59C80 and ZIDEFS/170/0x557C0.