On 02/06/2019 05:39 PM, Fritz Mueller via cctalk wrote:
On Feb 6, 2019, at 2:24 PM, Brent Hilpert via cctalk <[email protected]> wrote:Is the schematic available for the memory board at-issue? Curious myself to see what approach for refresh DEC used.Yes, here: http://bitsavers.trailing-edge.com/pdf/dec/pdp11/memory/MP00672_MS11L_engDrw.pdf There is also a technical manual adjacent, with circuit descriptions. I will scope this up tonight and take a look!
Yup, page 6, a 555 RC refresh timer! Jon
