🚀 go-pugleaf

Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

> I have reposted this here as nobody knows what I'm talking about in
demon.ip.support.mac,
> or am I talking crap?

No you're not.

[snip]

> Performa 5200, GV platinum 33.6, FreePPP 2.6b4, OS 8.1
> 
> Thanks for any help

At a rough guess, you've got non-DMA (direct memory access) serial
ports.  Apple's original serial driver call allowed you to select serial
port speeds up to 57600 bit/s and no higher.  Apple decided to write a
new serial port call when the DMA serial port Macs came out, and only
DMA serial port Macs can use this new version, which allows you to
select serial port speeds above 57600 bit/s.

Now then...  The clever chaps who write FreePPP worked out a hack so if
you didn't have a DMA serial port, you could still select speeds above
57600 bit/s (that limit wasn't a limit for the early Macs which can just
about handle 19200 bit/s serial communication over a PPP link with
normal software).  This doesn't help with older Macs, but my 25MHz
60LC040 475 is happy at 115200 bit/s - you need a fairly nippy processor
to avoid losing packets at higher serial port speeds without DMA.

My guess is that this hack breaks under OS8.1 for some strange reason.
Might I suggest an email to the FreePPP developer(s)?

Rowland.


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