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From: keithley@applelink.apple.com (Craig Keithley)
Newsgroups: comp.sys.m68k
Subject: re: 68332 with MMU
Message-ID: <11249@goofy.Apple.COM>
Date: 14 Nov 90 18:26:40 GMT
Sender: usenet@Apple.COM
Organization: Apple Computer Inc.
Lines: 19

68340 doesn't have a MMU.   Dual channel DMA, dual UARTS
68332 has a TPU (Timing Processing Unit -  REALLY great for automotive 
apps)
68331 no TPU (cheaper than a 332 )
68302  I forget... Anybody remember?

The 340 has a "background debug mode" implemented in IPU microcode.  
Instruction execution is suspended when the 340 is in background mode.  
Using the debug serial I/O port you can change registers, examine memory, 
etc without needing a debug monitor.

My only complaint about the 683xx series is that they are too expensive 
right now. 



Craig Keithley, Apple Computer
keithley@applelink.apple.com 
[standard disclaimers apply!]