Search found 681 matches

by hlide
Fri Mar 04, 2022 8:10 am
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

And how does MZ-80 A handle the VRAM conflict?
by hlide
Fri Mar 04, 2022 8:09 am
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

So you means when GAL decodes $F000-$F3FF, it generates one cycle /EXWAIT? That's so weird.
by hlide
Fri Mar 04, 2022 8:07 am
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

20µs is indeed very short. I'm not sure why the GAL is connected to /EXWAIT as an input or as an output especially for $F000-$F3FF. It remains a mystery for me.
by hlide
Thu Mar 03, 2022 10:56 pm
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

Yes but sampling should be done upon $E008.D7 (BLNK pulse) and not upon $E008.D0 (TEMPO pulse) as you seem to suggest to Ben.
by hlide
Thu Mar 03, 2022 3:59 pm
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

And I cannot find the link between /WAIT (connected to Z80) and /EXWAIT (connected to GAL) in the MZ-80 A schematics. /WAIT is just connected to Z80 with no pull in sight and I cannot spot /WAIT somewhere else. I suspect the schematics missing that part.
by hlide
Thu Mar 03, 2022 3:45 pm
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

MZ-80 K:
CSE2.png
MZ-700:
CSE2-700.png
by hlide
Thu Mar 03, 2022 3:37 pm
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

Also, I'm surprised : isn't $E008.D0 in input supposed to give use a 32Hz pulse for TEMPO? On MZ-700, D0 is 32Hz pulse and D7 is BLNK pulse.
CSE2.png
by hlide
Thu Mar 03, 2022 3:27 pm
Forum: Assembly
Topic: HBLANK (MZ-80A)
Replies: 25
Views: 12546

Re: HBLANK (MZ-80A)

@S_U_C I was vaguely supposing the GAL 82S100N (U40) was setting /WAIT = 0 when BLNK = 1 and /CSD = 0 in a similar fashion as MZ-700 to avoid snow effect when video circuit is reading VRAM. So I thought we could try to access VRAM to sync with the BLNK period and switch the hardware scroll address d...
by hlide
Mon Feb 21, 2022 9:40 pm
Forum: Hardware
Topic: Correct tape type
Replies: 12
Views: 6295

Re: Correct tape type

A little bit off-topic: I read we should avoid C-60 tapes for dataset because the more lengthy you get, the more speed will vary according the position due to mechanic constraints. The best is to take the length the closer to what you need to record for one program (it can be multi data block). Tryi...
by hlide
Mon Feb 14, 2022 11:37 pm
Forum: Hardware
Topic: Please help me identify this Sharp MZ hardware
Replies: 3
Views: 2653

Re: Please help me identify this Sharp MZ hardware

Oh there was a word processor WD-2000 (using a Z8000 processor). I suspect WD-50QI being an interface for a word processor.
DnZwv_BU0AAvTK8.jpg
DnZwv_BU0AAvTK8.jpg (64.55 KiB) Viewed 2650 times
sharp_wd2000_2.jpg
sharp_wd2000_2.jpg (19.78 KiB) Viewed 2649 times
sharp_wd2000.jpg
sharp_wd2000.jpg (15.6 KiB) Viewed 2649 times