The Rainbow in question was owned from new by a DEC employee. The system is marked PC100-B3 and displays Version 05.03E In other words about as up to date as you can get. Apart from the ageing VR201 with blue spot face plate mould it runs cool and quiet. It's a very good example and only lacks a VR241 colour display. I think I have most of the software that ever ran on a Rainbow under CP/M or MSDOS. -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Jeffrey Armstrong Sent: 30 August 2007 18:06 To: cctalk at classiccmp.org Subject: Re: DEC Rainbow Hard drive. I can't remember exactly, but the 100A was definitely 4.xx series (maybe 4.12?) while the 100B was definitely 5.xx series (maybe 5.03A). I've never seen different values on any Rainbow, though, suggesting that the boot roms were finalized before manufacturing started and never again updated. Could be wrong, though. Some Rainbow's have different character set ROMs, like the Technical Character Set ROM, but that doesn't change the firmware version on the boot menu. -Jeff jba at sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org