No soldering (or Vnicad) required; turns out that the M100 EXTRAM does indeed only use /WR and RAMRST with the XR4 also using /Y0 for the bank selection, all plugged into the bus. The 102 connected to an adjacent RAM chip instead, but no idea how they connected /Y0 on the 102.
m ----- Original Message ----- From: John R. Hogerhuis To: [email protected] Sent: Wednesday, October 25, 2017 10:39 PM Subject: Re: [M100] new project On Wed, Oct 25, 2017 at 6:10 PM Mike Stein <[email protected]> wrote: I think EXTRAM (and presumably also XR4) used RAMRST, at least in the M100; where is this Vnicad you speak of? If you mean Vb, I don't think it's available on the bus? If it was he wouldn’t need a wire soldered to get it :-) — John.
