2024-01-27 Debugging ZIP

#zip #todayilearned #z80

Finished transcribing all of the words in Chapter 6.

Now to debug them…

First, see if I can get MartyG’s simulation running…

Altair 8800 (Z80) simulator Open SIMH V4.1-0 Current        git commit id: 625b9e8d+uncommitted-changes
/home/cac/Projects/zip/MartyG/mg.ini-3> set cpu verbose
8192 bytes [32 pages] loaded at f000.
Warning: 16 pages modified.
/home/cac/Projects/zip/MartyG/mg.ini-7> g F000
%SIM-INFO: SIGINT will be delivered to your debugger when the ^F character is entered
#

Z80 ROM MONITOR V5.04 - LOW PAGE (J.Monahan,7/29/2014) 
SP=FFFF  IOBYTE= 11111111

->

But if a type a character, it goes berserk, like a was holding the character down. Reviewing the ROM listings to see if I can decipher the port bits.