Hello Steve,
On Tue, 12 Jul 2022 at 12:19, Steve Nickolas <usots...@buric.co> wrote: > I've been working on this for my own project, and it's only useful for the > rare CGA or Tandy users out there (which is probably why MS-DOS 6 > relegated it to the Supplemental disk and PC DOS 6 removed it). > > GRAFTABL hooks INT1F to provide the upper half of the charset in graphics > mode on a CGA or Tandy. (DISPLAY.SYS does this and more on more modern > display adapters.) The current version seems to be incomplete - only > supports a single hardwired codepage? - so I figured I'd offer my own, > which is my first successful attempt at a TSR that actually does > something. > 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
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