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Re: The way to detect OPL3 clone

Posted on 2023-09-23, 09:53

in Marvin \ Sound
You probably meant LS262, because LS245 is a mere TTL buffer which is also present on your sound card and externally looks similar. nope, there are no LS245 buffers soldered on my card (although there are footprints to support IDE interface), and that "LS245" chip is sharing traces with YMF262 …

Re: The way to detect OPL3 clone

Posted on 2023-09-22, 19:33

in Marvin \ Sound
Have to bump a thread since recently I did some research around Creative CQM chips, and seems I found the (fully) software way to detect if a CQM chip is used instead of OPL3. As I found out, setting bit 0 of LSI Test register (bank 0 index 1) on CQM chips makes bits 0-6 of status register return …

Re: Snow on ISA vga card

Posted on 2023-09-12, 15:41

in Marvin \ Video
yep, the palette SRAM is residing inside the RAMDAC ,otherwise you would need to feed 18 bits of pixel data from the VGA chip instead of 8 :) Speaking of snow itself, there are three distinct RAMDAC classes: - single-ported palette RAM with transparent latch on RGB DAC inputs. During CPU access to …

Re: S3 ViRGE DX - missing red colour

Posted on 2023-09-08, 20:33

in Marvin \ Video
Looks like this ferrite bead for red went bad somehow. Is it advisable to short it out as a fix, or should I find some SMD replacement? yeah, you can short ferrite beads out; in fact, this (along with RGB capacitors to ground removed) usually fixes image blurring at higher resolutions on cards with …

Re: S3 ViRGE DX - missing red colour

Posted on 2023-09-07, 18:06

in Marvin \ Video
I would also suggest checking traces between pin 1 on the VGA connector and pin 168 on the ViRGE/DX chip with a multimeter, including ferrite beads (marked as FBx on the PCB). In your case, check if FB1 and the resistor placed at Q1 are 0 Ohm and R33 (the load resistor) is measuring as 75 Ohm - …

Re: Cirrus Logic CL-5446

Posted on 2023-06-01, 19:37

in Marvin \ Video
Yep, the VBE implementation on older nVidia cards are decent. UniRefresh or VBEHz can be used to set the screen refresh rate for each resolution. The only exception is that they don't support 15bpp video modes that some games use (Alien Trilogy's high color option is one of these). offtopic: with a …

Re: CL-5446 being better than S3 Trio64v+ ?

Posted on 2023-06-01, 19:06

in Marvin \ Video
You know... Cannon Fodder crashing with and without UniVBE loaded. I know that this thread is a bit old but.. wbc's s3vbefix helps with Cannon Fodder on S3 cards ! Even those with VBE1.2 bios. At least it helps my S3Trio64V+ (1MB, VBE1.2). Not to mention 2.0 ones (I've tested S3Trio3d 2x and S3 …

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