[comp.sys.mac] Mac IIci Memory Management Blamed for Incompatabilities

18215MES@MSU.BITNET (05/02/90)

From Infoworld April 23 1990 - no permission

(Titled as the Subject says)

Apple Computer Inc. acknowledged last week that the IIci has been
experiencing an unexpectedly high number of hardware and software
incompatabilities.

"...the few (apps) that did have problems have generally been corrected
by this point", says Mike Benz - Apple Product Mgr for the IIci.
Nevertheless, the Iici already has gained a reputation as an ill behaved
machine. ...it contains the first update of the mac rom since the
original MAC II. The current version of the MAC os (6.05) tries to
correct some incompatabilities, and is now shipping with every MAC.
Most problems stemmed from Apple's decision to change the memory's
addressing scheme in the IIci, as well as utilizing the 68030's PMMU.

The IIci was the first to implement "non-contiguos memory", which
makes the system more flexible when configuring memory, but also
means there is no longer a one-to -one correspondence between logical and
physical memory space.
The memory addressing model is the same as that which will be used
in system 7. Use of the PMMU now prevents applications from requesting
access to ram with an invalid address.

Unlike the IIci, the IIfx does not use non-contiguous memory,
although it does use the PMMU to invalidate bad addresses.
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So there it is...

I still have major bombs on my IIcx 5/80 w/ 6.0.5 !!!

I have to replace the Macros file 2-4 times/week! Geesh! C'mon
Appple, it's not just the IIci,,, it's 6.0.5 !!!