Exclamation point?

Frequently Asked Questions about the Sinclair ZX81
Forum rules
This is designed to be a simple set of questions and answers - please no general chit chat in here - keep it focused to help new users!
User avatar
mrtinb
Posts: 1963
Joined: Fri Nov 06, 2015 5:44 pm
Location: Denmark
Contact:

Re: Exclamation point?

Post by mrtinb »

RS232 wrote: Tue Jun 04, 2024 11:07 pm Ok why a whole rom when you could just create a UDG for it under EightyOne emulator?
You assume that the use of a ZX81 is mainly in an emulator that supports UDG. If that's the case, then by all means do use UDG.

Many like to use real hardware however, and real hardware that supports UDG is rare.
  • dK'tronics 4K Graphics ROM
  • Quicksilver QS CHRS Board
  • UDG4ZXpand
  • Chroma interface
Martin
https://zx.rtin.be
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
User avatar
XavSnap
Posts: 1990
Joined: Sat May 10, 2008 4:23 pm
Location: 'Zx81 France' Fb group.

Re: Exclamation point?

Post by XavSnap »

HI,
Martin, note the ZXPRINTER printer can "Display" specials characters codes by moving the IR register on a RAM offset!
The ULA display will be corrupt, but the printer UDG will be changed.
:ugeek:

In Forth:
~@~ is equal to ~£~ and ~!~ is equal to ~$~ on ZX81
~[~ is equal to ~-(~ and ~]~ is equal to ~)-~ ,
~'~ is equal to ~(?)~
Ascii_forth.JPG
Ascii_forth.JPG (16.77 KiB) Viewed 1244 times
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Post Reply