On Tue, 12 Jul 2022, Aitor Santamaría wrote:
Once solved the "legal issues", one way to go could be to enrich DISPLAY instead of making a new driver. DISPLAY is organised as having "sub-drivers":DISPLAY CON = (EGA,437,2) where "EGA" is used to select the sub-driver, 437 is to declare the codepage that is hardwired in the hardware, and 2 is the number of how many room for CPIs you want. Ideally, you could add a "CGA" sub-driver, so that instead of GRAFTABL, one could issue DISPLAY CON=(CGA,437,1) and you save from the TSR stuff, the codepage loading stuff and the interrupts hooking stuff. Just an idea that lingered in my mind for a lot of time, although I never had an enormous interest to care about CGA. Aitor
I don't think there's any use for DISPLAY.SYS outside of EGA, VGA, and the PC Convertible. There isn't a way to override the text charset, which is what DISPLAY.SYS needs.
(I think the PC Convertible is, in fact, the only reason there's even an option - it supports loadable charsets, but only in 8x8, so installing a full charset, 8x8+8x14+8x16, would be a waste.)
-uso.
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