🚀 go-pugleaf

Rebecca and Rowland wrote:
> 
> 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.

An excellent hypothesis, and thank you for your time.

Do you think reverting to an earlier version of PPP might help?  I have
changed it recently.

I will notify the FreePPP group anyway.

Thanks again

-- 
Lawrence Flowers                  |   If I hadn't seen such riches,
LEAF TECHNICAL SERVICES LIMITED   |   I could live with being poor.
http://www.leaftech.demon.co.uk   |
leaf@leaftech.demon.co.uk         |   James