Re: Disk images: from //e to Mac via PC?

[supertimer@aol.com (Supertimer)]

m.kelsey@spam.eecs.wsu.edu wrote:

>supertimer@aol.com (Supertimer) writes:
>
>> The GS has AppleTalk built in, like Macintosh does.  You'll be
>> able to transfer files at 230kbits per second...several times faster
>> than even 56k modems!
>
>So I'm to believe the IIgs can sustain transfer rates of 230Kbit/sec?
>My stock //e (1Mhz) couldn't even pump out data at a full 19200 baud
>over null modem.  My stock IIgs can barely reach to 48Kbit out of
>56Kbit on upload.  I find it difficult to believe a stock IIgs can
>sustain 230Kbit unless an accelerator were in place!

In this case, CPU speed is not the limiting factor, but the serial
hardware.  The standard IIgs is 2.6-2.8Mhz, right?  Yet you can
do 48kbit...put an 8Mhz ZipChip in a IIe and it CAN'T go 19200
even though the CPU speed is faster than the GS.

For the same reason, an AppleTalked GS can link at 230kbit.
When AppleTaking, the GS uses the hardware characteristics
of the serial chip and motherboard to transfer at these high
speeds.  Timing is critical, so many interrupts are shut off...this
messes up things like 3200 color mode.

Remember...the GS can pump MUCH faster than 230kbit
with an SCSI card...or even with a floppy controller (which is
serial).  The serial hardware is the limiting factor, not the CPU
speed (except when doing error checking stuff like Zmodem).