🚀 go-pugleaf

In article <1jj6im$hfs@agate.berkeley.edu> ereiss@ocf.berkeley.edu (Edward Reiss) writes:

[summary of use if 2nd monitor for MS-Windows debugging under C/C++ 7 deleted]

> I purchased an inexpensive (and returnable) monitor and card, to
> see how my system (33MHZ 486 clone - "NICE" motherboard with Eteq chipset)
> would handle them. Lo and Behold - whenever the second monochrome video card
> is plugged into its slot, my main monitor slows down by at least 40%. Whenever
> it is removed, the system behaves normally.

The Hercules card is an 8 bit card which happens to live in the same 128k
address space block as your (assumed) VGA card. This forces the VGA card
to work in 8 bit (as opposed to 16 bit) mode. This is due to the Hercules
seeing all access to the VGA memory and indicating that the memory access's
are in 16bit mode.

> Can someone tell me how to get around this problem.

Don't know that you can without hardware surgery (a Soldering Iron).

> My system does have one unused serial port. Can I plug the monochrome
> monitor into this port and route the output of the debugger to it?

The video signals through the serial port? Answer no.

You may be able to use the serial port for serial debugging, I think that
Borland's Turbo Debugger allows this but I don't know about MS C7.

> Was it the type of monochrome card (cheap Hecules compatible with graphics
> capabilities) that slowed it down?

Yes, see above.

> Would a different card remedy the situation?

Maybe, but would probably have to me some sort of 'Non Standard'
configuration. I don't know if a real MDA acts in the same way.

> 
> Ed Reiss
> ereiss@cory.berkeley.edu

	DF
-- 
Derek Fawcus (G7FVS)                                df@eyrie.demon.co.uk