Found this file on an old Rainbow floppy. It has more detailed data. http://people.freebsd.org/~imp/RBMEMRY.TXT
Sorry I didn't convert it to HTML... Warner On Sat, Apr 15, 2017 at 7:49 AM, Tapley, Mark via cctalk <cctalk@classiccmp.org> wrote: > On Apr 13, 2017, at 3:20 PM, Warner Losh via cctalk <cctalk@classiccmp.org> > wrote: > >> On Thu, Apr 13, 2017 at 12:00 PM, shadoooo via cctech >> <cct...@classiccmp.org> wrote: >>> Hello, >>> I'm in the pretty same condition, I have a Rainbow 100B without memory >>> expansion. >>> Not sure however, about the correct board number, which would fit the 100B. >>> What should I search for? >> >> The DEC part numbers for these are PC1XX-AY (128k) and PC1XX-AZ >> (256k). I'm not sure what the board numbers are, and some auctions >> list those instead. >> >> They are the same board. There's 4 switches on the board. One for each >> of the 3 banks to select between 64kbit chips and 256kbit chips. You >> want 4164 or 41256 for the board. It's super easy to upgrade (I bought >> a AY back in the day and then 18 months later I bought 27 41256 chips >> and swapped them out in about 10-15 minutes. >> >> I'm not sure what the 100A needs. I have no experience with the 100A >> hardware. >> >> Warner > > I”m pretty sure the PC100A takes the same board. I believe I have a 100A set > up like that, but I’ll have to check when I get back (from vacation) in a > week or so (unless you get a definitive answer before that). Meantime if you > spot one of those boards, obviously it would be good to grab it; sounds like > there are 100B users on-list who would be happy to give it a home if I’m > wrong about it working in the 100A. > > Meantime, from my Rainbow Technical Manual copyright 1984 scan (ask, > I have a fair number of these documents) which says it refers to model PC100A: > > Rainbow Memory Extension Option Installation Guide: EK-PCMKE-IN > > …Two versions of the memory extension option are available: a 64 K byte > option (part number PC1XX-AA) and a 192K byte option (part number PC1XX-AB). > The memory option is installed in the J6 connector … > … Both versions of the memory extension option use the same printed > circuit board etch and the same type of 6kK x 1 bit memory chips. … the 192K > byte version contains twenty-seven 64K x 1 bit chips arranged as three 64K > byte memory stacks. ... > > > From my Rainbow Owner’s manual 1st ed. Sept 1983, Appx. C, Table C-1 > … > 64K byte memory board option: PC1XX-AC > 256K byte memory board option: PC1XX-AD > 64K byte memory component kit (9 chips) PC1XX-AY > 256K byte memory component kit (9 chips) PC1XX-AZ > … > > Hope this helps.
