Re: What is the difference between ROM 1 and ROM 3 IIgs computers?

[Pim Blokland <pDOTblokland@spcgroup.nl>]

David Empson wrote:
> 
> > >> Rom 1 is more compatible, and Rom 3 is slightly faster (because
> > >> the System Disk needs to patch less code).
> 
> More than slightly.  It is quite noticeable.  The main area of
> improvement is the QuickDraw II changes in System 5.0, which are in the
> ROM in a ROM 3 machine, but must be loaded into RAM on a ROM 1 (most of
> the low-level drawing bottleneck routines).

I don't have both a ROM 01 and a ROM 3 machine, so I can't check the
speed difference, but I do know this:
Virtually all toolboxes that come with GS/OS 6.01 have a newer version
number than the toolboxes that the ROM 3 machine has in ROM. This means
that any desktop application that uses the formal tool call entries to
start up the tools, load the tools from the system disk into RAM.
So a ROM 3 machine may be faster under system 5.0, but not so under
6.01.

And as far as I know, another difference between the ROM 01 and the ROM
3 GS, that has been neglected in this thread, is that the ROM 3 has a
different motherboard layout, which results in a "cleaner" sound output
signal, due to less noise from other components.
-- 
Pim Blokland
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