[comp.sys.mac.programmer] "Old region bug" / "128K ROM bug" - what is it?

bin@primate.wisc.edu (Brain in Neutral) (12/11/90)

I've been perusing some source code (e.g., Apple sample source code)
and have seen various references to "an old region bug" and "work around
a 128K ROM bug".  In both cases, the code in question seems to concern
setting up "wide open" regions, e.g., a region is set to a rectangle
of bounds	(-32768, -32768, 32766, 32766)
instead of	(-32768, -32768, 32766, 32766)

What's this about?
-- 
Paul DuBois
dubois@primate.wisc.edu

       "If you're not a docter, you're just pants" -- Ian D., age 3 1/2

Lawson.English@p88.f15.n300.z1.fidonet.org (Lawson English) (12/13/90)

Brain in Neutral writes in a message to All

BIN> setting up "wide open" regions, e.g., a region is set to a rectangle 
BIN> of bounds  (-32768, -32768, 32766, 32766)  
BIN> instead of (-32768, -32768, 32766, 32766)

I assume that that is a typo?

If not, that's an amazing bug fix! ;-)

Lawson

 

 

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bin@primate.wisc.edu (Brain in Neutral) (12/16/90)

From article <32373.2768411D@stjhmc.fidonet.org>, by Lawson.English@p88.f15.n300.z1.fidonet.org (Lawson English):
> Brain in Neutral writes in a message to All
> 
> BIN> setting up "wide open" regions, e.g., a region is set to a rectangle 
> BIN> of bounds  (-32768, -32768, 32766, 32766)  
> BIN> instead of (-32768, -32768, 32766, 32766)
> 
> I assume that that is a typo?
> 
> If not, that's an amazing bug fix! ;-)

Ah, yes, the virtues of yank/put not followed by thinking. :-)
Make that
> BIN> of bounds  (-32768, -32768, 32766, 32766)  
> BIN> instead of (-32768, -32768, 32767, 32767)

Again, anybody know what the "old region bug" or "128K ROM region
bug" is?
--
Paul DuBois
dubois@primate.wisc.edu

       "The coach has to eat baloney and french fries" -- Ian D., age 3 1/2