On Thu, Jan 7, 2016 at 2:08 PM, Brent Hilpert <[email protected]> wrote:
> On 2016-Jan-07, at 11:13 AM, nierveze wrote: > > first am 1 on the correct channel?? > > I have several S100 boards , found 25 years ago, > > ... > > > I wonder how it is possible to address more than 64K (rams+eprom)with a > Z80 . > > S100 memory boards often incorporated a bank-switching scheme to allow for > multiple 64K banks in the system. > The convention was a dedicated I/O port number (0x40?) to which one writes > a bit pattern to select the desired bank. > Such memory boards have configuration switches to set their bank ID/number. > For a system to use this scheme, all the memory boards in the system are > to be listening on that same port, waiting to recognise their ID. > > I designed and built such a board way, way back when I was an undergraduate. (The fact that it was for an S-100 system is sufficient suggestion of just how long ago....) Someone was doing medical image processing, IIRC. -- Ian S. King, MSIS, MSCS, Ph.D. Candidate The Information School <http://ischool.uw.edu> Dissertation: "Why the Conversation Mattered: Constructing a Sociotechnical Narrative Through a Design Lens Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org> Value Sensitive Design Research Lab <http://vsdesign.org> University of Washington There is an old Vulcan saying: "Only Nixon could go to China."
