ZuluSCSI

'ZuluSCSI is a comparatively new family of SCSI device emulators. Distinct features to older, similar devices is support for Wide-SCSI, Ultra-Speed, and a fast CPU.

ZuluSCSI also features an OpenSource firmware, so it can be extended comparatively easily.

Current state

In the scope of AS/400's, ZuluSCSI's disk support is still in its infancy, while CD- and tape emulation are seemingly solid. Some progress has been made, but there are still some rough edges, normally leading to crash of the Operating System with a given System Reference Code.

At the moment, the firmware supports only a single DASD device type.

Reports

• 2026-08-16, mikerm, 9406-170, Zulu firmware 2026-08-07. Trying to install V4R4 on the Zulu emulated DASD. Disk was created with dd if=/dev/zero of=HD6.img bs=522 count=17177940 status=progress
  • First try, prefetch setting at default (8k): halts at B1934505 after IPL takes place from DASD
  • Second try, prefetch set to 0: B6080801 after IPL takes place from DASD. More progress, and much quicker LIC install, though.
  • Configuration file used:

[SCSI]
LogModeData = 1 
System = AS400_BS522

See also

• Ordinary Harddisks on the AS/400
• Tape Drives on old AS/400
• SRC, aka System Reference Code

Weblinks

• ZuluSCSI Website — see the ☰ button top right for more details
• ZuluSCSI-firmware, GitHub