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I've scoured the web and the AA archives and I can't seem to find any schematics for the 7800 Maria. I'm referring to logic diagrams for the chip itself, not the 7800 motherboard. These do seem to exist for TIA but I can't find any for the Maria. Does anyone know if they even exist? Surely GCC must have had to conceptualize the internal logic of the chip at some point during development, right? The reason I ask is because I'm working on a hardware project for the 7800 and I've hit a point where I fear the only way to proceed forward will likely be to attempt to replace the Maria chip with an equivalent. This has already been done with TIA but I have yet to see this done with Maria. If anyone has any information at all, it would be greatly appreciated.
New palettes for ProSystem - Maria247, Maria252, Maria257, Maria262, Maria267, Maria272, & Maria277! Download them here: Maria2XX_Palettes_20131016.zip Not to be outdone by her older sister, Maria has received some new clothes as well. Like the Stella palettes, we have Phase Shifts 24.7 through 27.7 degrees in 0.5 degree increments. Unlike the Stella palettes under the Stella emulator, Maria has no easy way to make adjustments to the base values when being utilized under the ProSystem emulator, as many video options are not present. So, in addition to the base values, three varieties of intensity accompany the set. Also, the Maria palettes have different files for each region. NTSC and PAL regions are included. After further investigation and research, it appears what seems to be 'automatic' pot adjusting while the system is running is simply just the phase shifting. It is better understood and captured at a lower/cooler start (24.7 degrees) and watching via gradual increases of 0.5 degree. Previous palettes only offered phase shifts 25.7, 26.7, and 27.7. This set is much more complete and thorough in covering the 7800's hues and their respective phases on a CRT better than any prior releases. Screen captures to follow are in this order: Maria247 --> Maria252 --> Maria257 (aka 180 degrees colorburst) --> Maria262 --> Maria267 --> Maria272 --> Maria277 Color Charts (NTSC) Color Charts (PAL) Color Grids (NTSC) Color Grids (PAL) Following screen captures provide an example difference of intensity in this order: Maria262 --> Maria262x1 --> Maria262x2 --> Maria262x3 Donkey Kong XM Bentley Bear's Crystal Quest Here's the Phase shifting in action shown in the following order: Maria247 --> Maria252 --> Maria257 --> Maria262 --> Maria267 --> Maria272 --> Maria277 Joust Scrapyard Dog Enjoy.