Search found 465 matches

by hlide
Tue Jul 21, 2020 12:13 pm
Forum: Demoscene
Topic: MZ-700 demos
Replies: 79
Views: 20683

Re: MZ-700 demos

I prepare a pre-release...
by hlide
Sun Jul 19, 2020 8:52 pm
Forum: Other
Topic: [MZ-700] Vsync Checker
Replies: 3
Views: 488

Re: [MZ-700] Vsync Checker

So the Intel 8253 document says the counter decreases from N to 1 at raising edge of CLK (BLNK=1) and if 0, set OUT to 0 at falling edge of CLK then to 1 at raising edge of CLK. When the counter decreases to 0 the next value will be N-1. What seems to happen is the initial count is N+1 when N writte...
by hlide
Sun Jul 19, 2020 6:22 pm
Forum: Other
Topic: [MZ-700] Vsync Checker
Replies: 3
Views: 488

Re: [MZ-700] Vsync Checker

More precisely, the logic analyzer tells me: 312 - 112 = 200.
VsyncChecker.jpg
because the timers #2 is indeed counting two BLNK pulses as unit, I can imagine missing one unit but that would be 310. Here, we're missing 3 units.
by hlide
Sun Jul 19, 2020 6:09 pm
Forum: Other
Topic: [MZ-700] Vsync Checker
Replies: 3
Views: 488

Re: [MZ-700] Vsync Checker

Results: - Genuine MZ-700 tells me: 306 - 106 = 200. Timer #2 only counts ~306 BLNKs in a frame? - EmuZ-700/PAL tells me: 308 - 108 = 200. Timer #2 only counts ~308 BLNKs in a frame? My logic analyzer tells me there is 312 BLNK signals per frame. So how does it happen the timer #2 is missing 6 BLNKs...
by hlide
Sun Jul 19, 2020 4:20 pm
Forum: Other
Topic: [MZ-700/1500] EmuZ-700-1500/PAL or NTSC
Replies: 0
Views: 214

[MZ-700/1500] EmuZ-700-1500/PAL or NTSC

Add a "new" project on GitHub/SHARPENTIERS: EmuZ-700-1500 / PAL or NTSC Those are stripped source versions of the original EmuZ-700 and EmuZ-1500 with more accurate CPU and PAL video timings, more accurate BLNK signal handling. The NTSC version needs better information about NTSC video timings. Also...
by hlide
Sun Jul 19, 2020 4:09 pm
Forum: Other
Topic: [MZ-700] Vsync Checker
Replies: 3
Views: 488

[MZ-700] Vsync Checker

Add a new project on GitHub/SHARPENTIERS: MZ-700-VsyncChecker.
Try to determine how many BLNK signals the program can count in a frame through PIT counters #1 and #2.
by hlide
Sun Jul 19, 2020 12:28 pm
Forum: Demoscene
Topic: MZ-700 demos
Replies: 79
Views: 20683

Re: MZ-700 demos

There were two external missing libs so I added them to be able to build EmuZ-700/PAL (Select Release (PAL)).
by hlide
Sun Jul 19, 2020 11:41 am
Forum: Demoscene
Topic: MZ-700 demos
Replies: 79
Views: 20683

Re: MZ-700 demos

Place where to get EmuZ-700/PAL source: https://github.com/SHARPENTIERS/EmuZ-700-1500.
by hlide
Fri Jul 17, 2020 1:22 pm
Forum: Demoscene
Topic: MZ-700 demos
Replies: 79
Views: 20683

Re: MZ-700 demos

So I made a choice. First, I decide to remove any reference of MZ-800 from the source: unlike MZ-1500 which still shares a lot of similiraty with MZ-700 in hardware - especially they have both the same LSI - MZ-800 is a complete different beast when not in mz-700 mode and the LSI is totally differen...
by hlide
Wed Jul 15, 2020 7:51 pm
Forum: Demoscene
Topic: MZ-700 demos
Replies: 79
Views: 20683

Re: MZ-700 demos

ok, here is what I think how we should compute the wait states for: PUSH rr: T1 AB:000 DB:-- M1 | T2 AB:000 DB:C5 M1 MREQ RD | Opcode read from 000 -> C5 T3 AB:000 DB:-- RFSH | T4 AB:000 DB:-- RFSH MREQ | Refresh address 000 T5 AB:000 DB:-- | -----------------------------------------------------+ T6...