Search found 152 matches
- Fri Sep 27, 2019 8:32 am
- Forum: Other
- Topic: MZ-80A / MZ-80K extra RAM
- Replies: 22
- Views: 29256
Re: MZ-80A / MZ-80K extra RAM
Ahh... That's a bit diappointing, I've always believed that the 700 had hardware scrolling. Not that much use in the extra VRAM then. Isn't access to VRAM slower than RAM too? It looks like it's only accessed during blanking periods?
- Fri Sep 27, 2019 6:56 am
- Forum: Other
- Topic: MZ-80A / MZ-80K extra RAM
- Replies: 22
- Views: 29256
Re: MZ-80A / MZ-80K extra RAM
MZ-700 games could also effectively use that "second" memory to store a background to be restored when redrawing software sprites for instance. That's what I've been using it for in my current game project, but if I understand it correctly you should be able to use the second page for scr...
- Thu Sep 26, 2019 10:01 pm
- Forum: Games
- Topic: A small preview
- Replies: 9
- Views: 13244
Re: A small preview
Yes, a Tetris-game with both one- and two-player modes.
- Wed Sep 25, 2019 4:44 pm
- Forum: Games
- Topic: A small preview
- Replies: 9
- Views: 13244
A small preview
A small preview of a game Geir and myself has been working on for the last couple of weeks.
The game is written in C using z88dk.
The game is written in C using z88dk.
- Tue Sep 24, 2019 10:03 am
- Forum: Other
- Topic: [MZF] MZ7: MZF file compressor using ZX7 algorithms
- Replies: 16
- Views: 19138
Re: [MZF] MZ7: MZF file compressor using ZX7 algorithms
Tested this quickly today, it compressed my mzt-file to less than a third. Thanks a lot for this brilliant tool
- Mon Sep 23, 2019 9:28 am
- Forum: Other
- Topic: Detecting VBL on 800 in 700-mode
- Replies: 24
- Views: 30601
Re: Detecting VBL on 800 in 700-mode
This piece of code stolen from the monitor works. __asm push af wait1: ld a,(0e002h) rlca jr nc,wait1 wait2: ld a,(0e002h) rlca jr c,wait2 pop af __endasm Maybe the compiled C code isn't fast enough. VBL is low for less than 3ms, but it should take some pretty inefficient code to miss that. Edit: Ju...
- Sun Sep 22, 2019 9:39 pm
- Forum: Other
- Topic: Detecting VBL on 800 in 700-mode
- Replies: 24
- Views: 30601
Re: Detecting VBL on 800 in 700-mode
while (*(unsigned char *)0xe002 & 0x80); This is working on the 700 but always returns immediately on the 800 emulator in 700 mode. Why did I write "700" and not "700 emulator"? Because when I finally managed to test this on a REAL 700 it shows exactly the same behaviour. So...
- Sun Sep 22, 2019 8:03 pm
- Forum: Other
- Topic: [MZF] MZ7: MZF file compressor using ZX7 algorithms
- Replies: 16
- Views: 19138
Re: [MZF] MZ7: MZF file compressor using ZX7 algorithms
This is very interesting! I will definitely test this with my current project.
- Wed Sep 18, 2019 12:53 pm
- Forum: Other
- Topic: Detecting VBL on 800 in 700-mode
- Replies: 24
- Views: 30601
- Wed Sep 18, 2019 12:31 pm
- Forum: Other
- Topic: Detecting VBL on 800 in 700-mode
- Replies: 24
- Views: 30601
Re: Detecting VBL on 800 in 700-mode
I'm tempted to ask my friend to probe PC7 with a logic analyzer to see what's actually happening.