🚀 go-pugleaf

In article <6150@amc-gw.amc.com>, jwbirdsa@amc-gw.amc.com (James Birdsall) writes:
> In article <1991Mar12.140842.63@cbnewsh.att.com> rkl@cbnewsh.att.com (kevin.laux) writes:
> >In article <18203@milton.u.washington.edu>, roger@wrq.com (Roger Fulton) writes:
> >> In addition to setting the video mode,
> >> you need to also update the equipment flag at 0040:0010
> >> appropriately: xx10xxxx for color, xx11xxxx for mono
> >> (where 'x' means leave it alone).  Also, you should account
> >> for the fact that color systems have a different maximum
> >> cursor line count than mono systems (so you should save and
> >> restore the cursor when changing video modes).
> >
> >	Yes, there is but this is not it!  Those bits in the equipment flag word
> >are for the *INITIAL* video mode.  Changing those bits will *not* effect a
> >display adapter switch.  
> 
>    Sorry. Setting the BIOS equipment flag is the correct way to start. THEN
> you have to do a video mode switch to an appropriate mode. This is a known
> technique that works on a wide variety of machines that I have tried.
> 
	[Switch Active Display stuff deleted]

	Ok, I stand corrected and agree about using Switch Active Display
with a Hercules/VGA combination.  What you're saying is, start with changing
the Equipment word and then to access the Hercules, switch to Video Mode 07.
Wouldn't you also have to setup bit 3 at 40:87H and bit 6 at 40:89
(bit 3, 0 = VGA active, 1 = inactive; bit 6, 0 = display switch disabled,
1 = enabled)?  Or does the Mode switch take care of this?

-- 
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	R. Kevin Laux				Email: rkl1@hound.att.com
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