Search found 2 matches

by Panther
Fri Dec 07, 2018 1:06 am
Forum: Development
Topic: New to Machine code, help required
Replies: 17
Views: 2775

Re: New to Machine code, help required

Hi Panther, where does the 726 value come from? The standard screen is 22 lines x 32 columns so 704 positions. Also, if you press the CONT key, your first routine will print another screen of characters... Thats because the JR NZ tests the value of the A Register, you are decrementing BC. So, the r...
by Panther
Thu Dec 06, 2018 5:26 pm
Forum: Development
Topic: New to Machine code, help required
Replies: 17
Views: 2775

New to Machine code, help required

Hi peeps, New to the forum and looking for guidance as I take my first steps into ZX81 machine code !! I’ve been reading through ‘Mastering Machine Code on your ZX81’ and I’m understanding it so far but I’m a little confused with one of the most basic things; Printing to the screen !! One of the exa...