Brain dump thread on some troubles I'm having with MAME's emulationg of the TurboGX graphics board for Sun4 workstations. [thread]
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However, I have other documentation from BitSavers which has a penned-in note saying that IRQ 8 is for "video". If I trigger IRQ 8, then the Solaris 2.5.1 installer explodes with a repeating error message about an unexpected IRQ.
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It's not a matter of the board IDing improperly, because if it wasn't properly ID'd, then the installer wouldn't be tickling the exact hardware registers in order to kick drawing commands in the first place. TurboGX is pretty unique.
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I've even resorted to checking various BSD distro sources. They do support TGX - badly. In fact, the drivers all say that the info is based on pure reverse-engineering. Moreover, they don't wait for an IRQ to upload palettes, and there's a driver note saying they maybe should.
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