Search found 664 matches

by hlide
Fri Jul 15, 2022 3:13 pm
Forum: Demoscene
Topic: Sharper by Genesis Project
Replies: 10
Views: 561

Re: Sharper by Genesis Project

I'm indeed coding that star field as an exercise and yes there is no need to use stack for that : The critical section to be drawn is so short: ... EX DE,HL ; save the current VRAM position for the next iteration ; Start of the critical section of BLNK signal LD (HL),C ; clear the previous star char...
by hlide
Fri Jul 15, 2022 12:53 pm
Forum: Other
Topic: Display Codes
Replies: 4
Views: 223

Re: Display Codes

Indeed. From Left/top to right/bottom: NEXT_BAR: SUB $40 ; A' = (A - $40) MOD 256 JR C,@f ; if A == $7x then A' = $3x and skip the next instruction else A' = $Fx and execute the next instruction ADD $84 ; A'' = $Fx + $84 = $7x' where x' = (x + 4) MOD 16; wrap from $7C/7D to $70/$71. @@: ... From Rig...
by hlide
Thu Jul 14, 2022 4:29 pm
Forum: Demoscene
Topic: Sharper by Genesis Project
Replies: 10
Views: 561

Re: Sharper by Genesis Project

That's the simplest way to get those star dots though. Using other random characters would be over-complicated to deal with.
by hlide
Thu Jul 07, 2022 10:00 pm
Forum: Demoscene
Topic: Sharper by Genesis Project
Replies: 10
Views: 561

Re: Sharper by Genesis Project

@Sdw Oh I didn't see your answer. In fact I already found out how to do so (or at least something similarly) once I understood there is only one star per line: then it is very easy to be able to draw in the full 320x200 area! FXFZna2WYAA1VVK.png A simple PUSH to draw a dot and erase the right charac...
by hlide
Tue Jul 05, 2022 8:08 pm
Forum: Demoscene
Topic: Sharper by Genesis Project
Replies: 10
Views: 561

Re: Sharper by Genesis Project

Any technical explanation about the parallax star field? Even running on the emulator, it is quite impressive.
by hlide
Tue Jul 05, 2022 7:42 pm
Forum: Hardware
Topic: Help: Sharp MZ 700 short fuse with video connection
Replies: 12
Views: 913

Re: Help: Sharp MZ 700 short fuse with video connection

You don't need to solder a SCART. Breadboard, resistors and Dupont wires and an Amiga SCART cable and then you can test. It doesn't need to be permanent. The issue is to discover whether your RF box is the culprit.
by hlide
Thu Jun 23, 2022 6:15 am
Forum: Hardware
Topic: Problem with MZ80-A CRT
Replies: 7
Views: 453

Re: Problem with MZ80-A CRT

(Answers from https://www.facebook.com/groups/sharp8bitmz/permalink/3196131587370272) I would check around the horizontal drive for a dodgy gnd connection, a faulty resistor/capacitor filter combo or the ic itself. It looks like it may be on the linearity side This is the spec sheet for the ic and h...
by hlide
Thu Jun 09, 2022 4:52 pm
Forum: Hardware
Topic: MZ-80a US Power Supply
Replies: 4
Views: 378

Re: MZ-80a US Power Supply

Ah sorry!!!! I thought about MZ-700 so yeah you may need 5V and 12V. And I wonder whether -5V may also be needed. But anyway, there are Meanwell PSUs which can provide those different voltages.
by hlide
Wed Jun 08, 2022 8:43 pm
Forum: Hardware
Topic: MZ-700 correct filter capacitors for PSU
Replies: 12
Views: 1614

Re: MZ-700 correct filter capacitors for PSU

Do not bridge the connections! Either you replace them with more modern caps like the ones in timh's last picture or you just remove the depleted ones but never ever ever connect them with conductive wires (that's what we would call a short circuit!).
by hlide
Tue Jun 07, 2022 10:49 pm
Forum: Hardware
Topic: MZ-700 correct filter capacitors for PSU
Replies: 12
Views: 1614

Re: MZ-700 correct filter capacitors for PSU

tingo wrote: Sun Apr 03, 2022 5:07 pm they are supposed to blow before the equipment gets damaged or catches fire.
Ahem, fuses are for that. Those old caps due to their "paper" conception ALWAYS blow and catch fire after a decade, not because they are used as fuses.