RIVA 128 Reverse Engineering \ VOGONS

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RIVA 128 Reverse Engineering

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First post, by Alegend45

Posted on 2015-05-21, 19:09

Alegend45 Offline

Rank Newbie

Rank: Newbie
Posts: 77
Joined: 2012-06-23, 18:18

Hello. I'm currently writing RIVA 128 emulation for PCem. Right now, I am attempting to ascertain the function of CRTC register 38h, and I've written a basic test program that I hope will shed light on what it does. Can somebody with a RIVA 128 please run this program and give me a picture of what you see?

The attachment 38h.zip is no longer available

Reply 1 of 3, by keropi

Posted on 2015-05-21, 19:16

keropi Offline

Rank l33t++

Rank: l33t++
Posts: 9675
Joined: 2003-09-08, 06:45
Location: Greece

just tried it with my p200mmx/r128zx build, it does not show anything... it clears the screen and just quits to the prompt

🎵 🎧 ⏳ ⚡ MK1869, PCMIDI MPU , OrpheusII , Action Rewind , Megacard and 🎶GoldLib soundcard website

Reply 2 of 3, by Alegend45

Posted on 2015-05-22, 01:00

Alegend45 Offline

Rank Newbie

Rank: Newbie
Posts: 77
Joined: 2012-06-23, 18:18

Interesting. Try running this one. I'm trying to see if it's a screen clear, screen disable, or linear framebuffer bit.

If it's a screen clear, then an A will show up on the screen.

The attachment riva128.zip is no longer available

Reply 3 of 3, by keropi

Posted on 2015-05-23, 09:09

keropi Offline

Rank l33t++

Rank: l33t++
Posts: 9675
Joined: 2003-09-08, 06:45
Location: Greece

just tried that, it clears the screen and I get an "A"

🎵 🎧 ⏳ ⚡ MK1869, PCMIDI MPU , OrpheusII , Action Rewind , Megacard and 🎶GoldLib soundcard website

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