Apple HD-20 (Non-SCSI): Which Macintosh Computers Support It

With what Macintosh models can I use a serial HD-20?

This article has been archived and is no longer updated by Apple.
Support of the serial HD-20s is not tied to System Software, but to the ROM
in the respective systems.

The following Macintosh models have support for the serial (non-SCSI) HD-20
built into ROM:
* Macintosh 512Ke
* Macintosh Plus
* Macintosh SE
* Macintosh Classic
* Macintosh IIci
* Macintosh Portable

The following Macintosh models do NOT have this support built in:
* Macintosh SE/30
* Macintosh II
* Macintosh IIx
* Macintosh IIcx
* Macintosh IIsi
* Macintosh IIfx
* Macintosh LC

For more information on the serial HD-20, see the article "Old HD20 and New
Mac SE/30".

Published Date: Feb 18, 2012