Yeah, I'm thinking mine is a Rev C that met the requirements for Rev D (seems to be a D in marker).
If the board serial is what's in marker there, and is 1-00494 - that's pretty close to the serial, so that would kind of line up. I just haven't been able to find any other machines in the same serial range or even lower that don't have the Revision that came after. -----Original Message----- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Al Kossow via cctalk Sent: Saturday, December 29, 2018 2:09 PM To: cctalk@classiccmp.org Subject: Re: Osborne-1 with prototype-based motherboard On 12/29/18 12:53 PM, Brad H via cctalk wrote: > I reached out to Lee Felsenstein on it and he suggested it was related > to the boards produced for the 10 prototypes Osborne built I'm pretty sure I threw one of those out about five years ago. Will dig through the archive to see if there are any earlier schematics seems like most out there are for the multi-layer board the original technical manual mentions there were 6 revs of the pcb http://bitsavers.org/pdf/osborne/osborne1/2F00153-01_Osborne1TechnicalManual_1982.pdf page 13
