Search found 120 matches

by Jo Even
Thu Nov 07, 2019 8:48 pm
Forum: Other
Topic: MZ 700 - detect PAL/NTSC
Replies: 13
Views: 535

Re: MZ 700 - detect PAL/NTSC

I guess you wrap it with DI : ... : EI to delete any interrupt? No, I did not. Tried this now but it did not make a difference. Emulator: I'm not expecting the emulator to run each instruction at an accurate 3.57 MHz frequency. An emulator tends to run a batch of instructions then pause to make the...
by Jo Even
Wed Nov 06, 2019 10:00 pm
Forum: Other
Topic: MZ 700 - detect PAL/NTSC
Replies: 13
Views: 535

Re: MZ 700 - detect PAL/NTSC

Btw I "solved" this problem by not using this timer at all, I count how many times I can increment a variable between two VBL's. Not the most elegant solution but it's working.
by Jo Even
Wed Nov 06, 2019 9:32 pm
Forum: Other
Topic: MZ 700 - detect PAL/NTSC
Replies: 13
Views: 535

Re: MZ 700 - detect PAL/NTSC

I'll try to remember that :) Did some more test and got things "working" on real hardware. "Working" as in "something happens". I don't understand the results. The crude test code looks like this: vbl(); *((unsigned char *)0xe007) = 0x74; *((unsigned char *)0xe005) = 0x00; *((unsigned char *)0xe005)...
by Jo Even
Tue Nov 05, 2019 1:18 pm
Forum: Hardware
Topic: Dumping character ROM
Replies: 11
Views: 547

Re: Dumping character ROM

UncleBod wrote:
Fri Oct 25, 2019 6:27 am
I am more interested in the label on the prom.
The swedish character ROM is an EPROM with a blank sticker over the window.
by Jo Even
Tue Nov 05, 2019 11:42 am
Forum: Other
Topic: MZ 700 - detect PAL/NTSC
Replies: 13
Views: 535

Re: MZ 700 - detect PAL/NTSC

Only 0xffff.
by Jo Even
Mon Nov 04, 2019 9:26 pm
Forum: Other
Topic: MZ 700 - detect PAL/NTSC
Replies: 13
Views: 535

Re: MZ 700 - detect PAL/NTSC

Software: 8253.CLK1 = /BLNK. Between two fall-edge /VSYNC count how many /BLNK occurs (reading CNT1 before and after and compute delta for instance). It should give the number of lines which should reflect a PAL or NTSC number of lines. Just tested this, and while it worked fine (sort of) in the em...
by Jo Even
Mon Nov 04, 2019 8:17 pm
Forum: Games
Topic: Bomberman for GCG-700
Replies: 4
Views: 298

Re: Bomberman for GCG-700

Very nice!
by Jo Even
Mon Nov 04, 2019 8:15 pm
Forum: Games
Topic: A small preview
Replies: 9
Views: 593

Re: A small preview

fitus wrote:
Sat Nov 02, 2019 4:07 pm
Are there any other projects in Z88DK for MZ 700/800?
I have started on another game for the 700, also written in C using z88dk.
by Jo Even
Mon Nov 04, 2019 8:15 pm
Forum: Games
Topic: A small preview
Replies: 9
Views: 593

Re: A small preview

fitus wrote:
Sat Oct 26, 2019 5:24 pm
Any progress? Looks very very nice!! 😉
Yes, the game is basically finished. I have just one small detail left but has been occupied with other things lately.
by Jo Even
Mon Nov 04, 2019 8:08 pm
Forum: Hardware
Topic: Dumping character ROM
Replies: 11
Views: 547

Re: Dumping character ROM

By analyzing Swedish characters, I realized that there were duplicate characters (pink color) and poorly copied characters (in red) compared to Western originals (attached image). The duplicate characters are there to avoid patching software. Take a look at my Swedish keyboard and you'll see what I...