Order of the Butterfly
Posts: 265 from 2005/8/25
Hi. I'm accessing the internet using a plain 56k serial modem and miami (Amiga 1200) and the i/o serial rate is so slow under MOS that makes me switch to AmigaOS every time i want to run a net application.
I have already discuss this issue in another forum so allow me to paste the relevant posts here.
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Other person:
Just remember that Miami runs in 68k emulation and that depends on how fast your PPC is. There are huge difference between 603/160 and 604/233.
Me:
I understand what you say, but i don't think that this can explain the slow-down of the serial port i/o under MOS. Perhaps it does, i don't know.
The fact is that the speed of the downloading gets halved with miami running under MOS. I experience a similar effect under AOS 3.9, when i try to play a movie with a WarpOS player while i download a file. If i try do the same with a 68k player, the downloading speed doesn't get affected much.
Hmm.. i see a pattern here: Is it possible that the PowerPC CPU mess up the serial port transfers? Could this kind of problems be solved with the addition of a fast, buffered serial port like silver-surfer?
Other person:
The fact is that you are using 68k serial.device :) It seems PPC native serial.device is missing from PowerUp cd. Try with this (ripped off from PowerUp 0.4 archive).
Me:
I have already tried this device. It makes miami to idle forever at the message "connecting ppp level LCP please wait".
Other person:
Ah, that is bad. Then there is not much to do I'm afraid. 68k serial is slow because JIT doesnt work in interrupts and interpretetive emulation on PowerUp cant beat real 68k.
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I must also add that i get more frequent connection hang-ups under MOS and that in some cases miami is not able to reset the modem forcing me to do a reboot.
I hope there is a solution to this or that the release date of the MOS native TCP/IP stack is near.
Amiga 1200 user.