Re: Why do old IIc and IIe have poor comm skills?

[shoppa@almach.caltech.edu (Timothy D. Shoppa)]

In article <41fb02$fea@aplinfo.jhuapl.edu>, Robert Jensen <bob_jensen@jhuapl.edu> writes...
>Why is it that a II+ can run Kermit at 2400 bps (or more) and yet
>the old IIe and IIc computers have trouble and miss characters?
>What did the II+ have that the next generation lost?
> 
>A while back, Apple would upgrade the motherboard of a IIc if
>the owner had a demonstrated need, like having a 2400 bps modem.
>What is the difference between the old and new boards that solves
>the problem? I witnessed before and after performance and it was
>significantly different.
> 
>I recently slipped a IIe into the place long occupied by a II+
>and am sad that something (Kermit) performs worse than before.

I'm afraid you'll have to give us some more details; in particular,
which serial card are you using?  How are the interrupts set?
Are any of the peripheral cards different than before?  Are
you using the same 80-column card?  Is the IIe an enhanced model?

I'm willing to bet that you changed 80-column cards, and the new
card is just intrinsically slower in scrolling, and you're losing
characters whenever there's a newline.  You might try putting your
old II+'s 80-column card in the IIe, and seeing if it helps (or
works at all!)

Tim. (shoppa@altair.krl.caltech.edu)