Search found 279 matches

by mz-80a
Thu Oct 21, 2021 5:19 pm
Forum: BASIC
Topic: S-BASIC Screen Scrolling
Replies: 2
Views: 38

Re: S-BASIC Screen Scrolling

Yep, a waste of memory then which could be put to better use for more space for BASIC programs. Took me ages to work out that you could scroll the screen up with SHIFT - UP :D It surprised me though because I assumed the 700 didn't have the 2KB VRAM which the 80A has.
by mz-80a
Tue Oct 19, 2021 6:58 am
Forum: BASIC
Topic: S-BASIC Screen Scrolling
Replies: 2
Views: 38

S-BASIC Screen Scrolling

Is S-BASIC really wasting precious memory keeping a copy of the screen so that you can scroll a BASIC listing back into view again when it's disappeared off the top of the screen? (Like the MZ-80A, except the 80A actually has 2KB of VRAM especially for this purpose).
by mz-80a
Thu Sep 30, 2021 1:38 pm
Forum: Assembly
Topic: LD SP,????
Replies: 3
Views: 140

Re: LD SP,????

Thanks. That's what I thought anyway. I didn't want to find myself overwriting anything that the Monitor would use the stack for. But I guess if you are resetting the SP to $10F0 like this then the Monitor routines won't change it at all and it'll all just be used correctly. At least, when just call...
by mz-80a
Wed Sep 29, 2021 10:02 am
Forum: Assembly
Topic: LD SP,????
Replies: 3
Views: 140

LD SP,????

Hi,

Just wondered, when you're writing your assembly programs, is it acceptable to use LD SP,$10F0 ? i.e. use the Monitor's work area as a stack? Or should this be avoided?
by mz-80a
Tue Sep 28, 2021 5:45 pm
Forum: BASIC
Topic: SA-5510 Disassembly
Replies: 9
Views: 258

Re: SA-5510 Disassembly

Thanks, I'll check this out
hlide wrote: Mon Sep 27, 2021 10:35 pm So I removed the SD part to keep original code to issue a listing:
SA-5510.zip
by mz-80a
Tue Sep 28, 2021 5:44 pm
Forum: BASIC
Topic: SA-5510 Disassembly
Replies: 9
Views: 258

Re: SA-5510 Disassembly

No, as I say, the instructions are to load BASIC SA-5510 first, then type in MON to get back to the Monitor and then you must load this 'loader' program. Just trying to transfer the software into MZF format but it's going to take a bit of work as there is no stored header on the tape (the loader pro...
by mz-80a
Mon Sep 27, 2021 4:15 pm
Forum: BASIC
Topic: SA-5510 Disassembly
Replies: 9
Views: 258

Re: SA-5510 Disassembly

The reason I ask is because I have some software which asks you to load SA-5510 first and then load the software. This software has its own Loader program which I've disassembled to the following: LD A,67H LD (15B5H),A LD (15F1H),A LD (15FBH),A LD (16CEH),A LD (1621H),A LD HL,B028H LD DE,10F0H LD BC...
by mz-80a
Sat Sep 25, 2021 10:08 pm
Forum: BASIC
Topic: SA-5510 Disassembly
Replies: 9
Views: 258

Re: SA-5510 Disassembly

OK, thanks. Although that doesn't show the memory addresses for the instructions. Pretty good though.
by mz-80a
Thu Sep 23, 2021 9:46 pm
Forum: BASIC
Topic: SA-5510 Disassembly
Replies: 9
Views: 258

SA-5510 Disassembly

Is anybody aware of a disassembly listing for SA-5510 ?
by mz-80a
Tue Aug 31, 2021 7:46 pm
Forum: Hardware
Topic: replacement parts for MZ-80K help needed
Replies: 16
Views: 528

Re: replacement parts for MZ-80K help needed

Longest sentence I've ever read. I have ordered a TL866II programmer I know what you are saying but I have some other retro computers so might come in handy just out of interest what are the min chips that need to be installed to see if I am making progress so I have ordered a new z80 so with a new ...