On Saturday, October 8, 2022 at 12:57:22 AM UTC-5, wolfgang kern wrote:   
   > On 07/10/2022 22:42, muta...@gmail.com wrote:   
   > > On Friday, October 7, 2022 at 6:48:02 PM UTC+8, Joe Monk wrote:   
   > >> "Right, and what is preventing an 8086 tiny model program   
   > >> from running on an 8080-replacement? "   
   > >> 8086 is source compatible with 8080. That means an 8086 can run 8080   
   instructions - but the reverse is not true.   
   > >   
   > > There was a translation program required to   
   > > convert 8080 source into 8086 source.   
   > yeah, but only to improve performance   
   > > But even if that was not required, that   
   > > still doesn't answer my question.   
   > >   
   > > I'm after an 8080 replacement that does a   
   > > SUBSET of 8086 tiny model instructions.   
   > >   
   > > Is that possible, or is there a technical   
   > > issue in switching between 8 bit   
   > > and 16 bit such that the closest you   
   > > can get is source translation?   
   > have you checked on 8085, Z80 and Z-280 ?   
   > Z80 can do 8080 code but is different from 8086.   
   > back then long ago I decided for ZILOG and built   
   > my first mini-PCs with Z80 and NSC800 (1979...)   
   >   
   > my favorite MC/CPU was Z-280 until 1985, after   
   > this I started with purchased 286/AMD486..64 PCs.   
   >   
   > But my production line on ZILOG based mini-PC run   
   > until 1997 even I programmed a lot of x86 stuff :)   
   >   
   > I skipped 80186, 80386 and all later Intel-crap   
   > because I prefer AMD (currently on RyZen5).   
   > __   
   > wolfgang   
      
   I was fond of the Amstrad PCW 8256 which had the Z80 and a   
   custom FPGA which managed 3 memory banks and ran CP/M-PLUS   
   aka CP/M-3 in banked mode.   
   The FPGA also managed a Hercules like video in monochrome graphics.   
   It also managed excess memory as a RAM drive.   
   Bank 0 held the ancillary system code and interface to the FPGA.   
   Bank 1 held the typical application memory.   
   Bank 2 had the memory mapped graphic image.   
      
   Steve   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)