2 Apr
2006
2 Apr
'06
5:12 p.m.
On Sunday 02 April 2006 07:52 pm, Jim Battle wrote:
Chuck Guzis wrote:
I've always wondered about that one myself...
And why it was necessary to stuff parameters into registers, when it's easy
enough to put 'em on the stack, among other things.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Although I've written several CP/M CBIOSes,
I've never had to write one
on a system that used the Trap vector (0066h) for something essential.
Just curious--has anyone had to deal with servicing the Trap interrupt in
CP/M? How does one keep CP/M from clobbering the vector, since it's in
the FCB2 area?
Chuck, I have no answer for you, but it reminds me of a point I've
always wondered about. The CP/M service call to 0005 takes three bytes
-- why didn't they move it three bytes forward so that the one byte "RST
1" call could have been used instead?