Identifying Machine for DEC Memory

On Wed, 1 Apr 2020 at 16:13, Rob Jarratt <robert.jarratt at ntlworld.com> wrote: That is... not very informative. :-( I also note that the listing just says VS4000 and does not specify a model. It could be one of 5 different models, all of different speeds: a 4000/60, 90, 90A, 96 or VLC. Could you just put the DIMM onto a flatbed scanner or something? The -12 on the chip part number implies 120ns RAM to me. That is slow by modern standards -- before EDO came in, PCs tended to take 70ns, 80ns was slow and 60ns was fast. 120ns would be quick enough for a 4000/60 or 4000/90, marginal for a 4000/90a and too slow for a VLC or 4000/96. Speeds from: https://en.wikipedia.org/wiki/VAXstation#VAXstation_4000_Model_VLC -- Liam Proven ? Profile: https://about.me/liamproven Email: lproven at cix.co.uk ? gMail/gTalk/gHangouts: lproven at gmail.com Twitter/Facebook/LinkedIn/Flickr: lproven ? Skype: liamproven UK: +44 7939-087884 ? ?R (+ WhatsApp/Telegram/Signal): +420 702 829 053