🚀 go-pugleaf

In article <1993Jan24.180434.2420@nidat.sub.org>, Nitezki@NiDat.sub.org (Peter Nitezki) writes:

| Basically the second!
| 
| Once it was called Zuse architecture (then von Neumann took over).
| After a while it got a writable control/instruction (as you like it) store  
| and was called Harvard architecture; just to take over in the modern DSP  
| designs.

  I agree, and I don't have the refference, either.

  As a historical note, back in the bad old days I had an app which just
wouldn't fit in the 64k I could address with a Z80. And the budget
didn't allow something else (not that there was mush at that time). With
the help of a friend to hack the hardware, I came up with a solution, a
version of CP/M which loaded the program in one memory bank in so-called
"master mode," then jumped to the program in "slave mode."

  What we had done was bank switching, such that when the CPU did an
opcode fetch, the M1 cycle, it came from the code bank, and when the CPU
did any other data access it went in the "data" bank. The program was
all written in a B offshoot called IMP, so I could easily avoid the self
modifying code prevalent at that time.

-- 
bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
	A terible poker player can have a winning hand,
	A obnoxious fool can have a good idea.
	Both are winners, regardless of who has them.