Search found 959 matches

by TmEE
Thu Mar 14, 2024 4:16 am
Forum: Other Retro Dev
Topic: How many color on some retro console
Replies: 11
Views: 1048

Re: How many color on some retro console

Regarding the palettes, my artist friends use "master palette" to refer to the entire hardware color capability out of which they choose colors to use on stuff they draw within the tile/sprite limits.
by TmEE
Wed Mar 13, 2024 5:44 am
Forum: Other Retro Dev
Topic: How many color on some retro console
Replies: 11
Views: 1048

Re: How many color on some retro console

It should be noted that the ranges may not be linear either. In case of MD, the DAC output is intentionally nonlinear with larger steps at lower and higher end and more compressed steps in the middle. MD also has the "Shadow and Highlight mode" which uses additional output levels on the DA...
by TmEE
Tue Mar 12, 2024 11:23 am
Forum: SNESdev
Topic: S-PPU and the V9990 (also MSX3)
Replies: 14
Views: 3493

Re: S-PPU and the V9990 (also MSX3)

MD VDP doesn't have 15bit output, it looks to have readyness for 12bit format but the lowest bit of each channel never made it in and you have 9 bits instead. It looks like they ran out of silicon to have all the extra CRAM bits (there is space but it is in wrong side of the chip pretty much). There...
by TmEE
Thu Feb 22, 2024 4:53 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 988

Re: Weird 15 in 1 Cartridge

The resistors are to give a defined state on the 4 outputs when !OE signal is high (which makes these outputs go to hi-z state). I think it enforces the first bank that way too.
by TmEE
Tue Feb 06, 2024 2:11 pm
Forum: SNESdev
Topic: Can a SNES ROM be decoded from audio waveforms?
Replies: 3
Views: 510

Re: Can a SNES ROM be decoded from audio waveforms?

If it absolutely has to go over internet radio using MP3 compression, probably at very low bitrate, you're gonna have to cook up your own data format that isn't harmed by the MP3 compression and appropriate tools to convert the data. Appropriating some ancient datasette formats is possible but you m...
by TmEE
Thu Jan 18, 2024 7:00 am
Forum: General Stuff
Topic: Legality of Security Codes in Retro Games
Replies: 23
Views: 4223

Re: Legality of Security Codes in Retro Games

That clicking or ticking type noise is power supply trying to come online but shutting off due to overcurrent, it is the core itself that makes the noise after every overload inrush. Better PSUs stop trying after a few times to spare the switching transistors for the excess stress. Reason for it is ...
by TmEE
Mon Jan 15, 2024 2:27 pm
Forum: Other Retro Dev
Topic: Reviving a VT100 CRT
Replies: 13
Views: 2031

Re: Reviving a VT100 CRT

So you did manage to find a replacement, that is good ~

Good luck with the rest ~
by TmEE
Sun Jan 14, 2024 5:05 am
Forum: Other Retro Dev
Topic: Reviving a VT100 CRT
Replies: 13
Views: 2031

Re: Reviving a VT100 CRT

What was needed to make it come to life ?
by TmEE
Thu Dec 28, 2023 8:51 pm
Forum: Other Retro Dev
Topic: Reviving a VT100 CRT
Replies: 13
Views: 2031

Re: Reviving a VT100 CRT

That is the brown glue corrosion, this sort of glue was used in a lot of electronics and all these years later it has become corrosive and is the cause of a lot of dead electronics : https://sound-au.com/articles/yellow-glue.htm That's a pretty old style flyback. In theory it could be rewound but it...
by TmEE
Thu Dec 28, 2023 6:46 am
Forum: Other Retro Dev
Topic: Reviving a VT100 CRT
Replies: 13
Views: 2031

Re: Reviving a VT100 CRT

* Is the filament supply coming out the flyback or some alternate location ? If from flyback then line deflection bits are working and there should be HV... * If you turn up the image controls, will any sort of raster appear on the screen ? If nothing appears, there's no HV despite working deflectio...
by TmEE
Tue Dec 19, 2023 12:08 am
Forum: Other Retro Dev
Topic: Anybody know why the Neo Geo uses 2 different kinds of ADPCM?
Replies: 4
Views: 1113

Re: Anybody know why the Neo Geo uses 2 different kinds of ADPCM?

It is because YM2608 has few fixed drum samples come out of an internal sample ROM and they didn't need all the possible quality. YM2610 removes the ROM and makes it a dedicated external DRAM memory interface and you have these two memory buses with their two slightly different formats as a result. ...
by TmEE
Fri Dec 08, 2023 7:09 am
Forum: NES Hardware and Flash Equipment
Topic: Help to program 16 bit EPROMs on a 8 bit programmer
Replies: 12
Views: 4131

Re: Help to program 16 bit EPROMs on a 8 bit programmer

It should be possible to program the 322 in two halves way too, but by leaving one side pulled high. When erased, the chip turns into all "ones" and when programming only the "zeros" are written. You can program any "one" into a "zero" but not the other way, s...
by TmEE
Tue Nov 21, 2023 6:03 am
Forum: NESdev
Topic: 6502 SBC and NES Clocking
Replies: 20
Views: 3948

Re: 6502 SBC and NES Clocking

One other thing that can be done is to freeze the NES side to make things fit into VGA (or some other resolution) specs, games/software would be unaware that anything had happened, which may work better than inserting an excess line on the NES side.
by TmEE
Thu Nov 16, 2023 8:10 am
Forum: NES Graphics
Topic: Nintendo/Ikegami's 80s Arcade graphics chip?
Replies: 26
Views: 6129

Re: Nintendo/Ikegami's 80s Arcade graphics chip?

It has all of these indvidual components you listed, joined up into larger things like counters, comparators, decoders and even memory, which ultimately get you pixels on the screen etc.
All chips work the same way too, just that things are microscopic instead lol
by TmEE
Tue Nov 14, 2023 9:10 am
Forum: NES Graphics
Topic: Nintendo/Ikegami's 80s Arcade graphics chip?
Replies: 26
Views: 6129

Re: Nintendo/Ikegami's 80s Arcade graphics chip?

There isn't a singular graphics chip there but a whole board of discrete logic and sometimes some simple programmable logic chips, that in their entirety make up the graphics and sound etc. functions. When you look at photos of the actual PCBs of these games you see a zoo of parts.