MODE32 is a software product originally developed by Connectix for certain models of the Apple Macintosh. It was published in June 1991 and originally cost US$169;[1] however, on September 5, 1991, the software was made available free to customers under licensing terms with Apple Computer.[3]
MODE32 patches the ROM code in certain models of early 68020 and 68030Apple Macintosh computers (see "Affected models" below)[1] which were advertised by Apple to support 32-bit memory management. Despite the machines' hardware being designed to support 32-bit mode, the lack of a 32-bit Memory Manager in ROM forced these machines to run in 24-bit mode, which crippled these otherwise high-end machines to support only 8 MB of RAM.[4] Prior to licensing MODE32, Apple had been subject to many complaints from individuals over the lack of 32-bit support.[3]
Versions of MODE32 prior to 7.5 include a control panel under Macintosh System 7 that lets the user enable or disable MODE32.[1][2] The option to enable 32-bit addressing can be found in the Memory control panel when MODE32 is enabled.[1] Otherwise, the option is not displayed.
For System 7.0 and 7.1, MODE32 version 1.2 was recommended. In the case of System 7.5 (and if Thread Manager was loaded), Connectix specifically recommends MODE32 7.5 in order to avoid problems with file corruption.[2] If MODE32 1.2 was installed over 7.5, Connectix recommends a complete reinstall of the operating system.[2]
Generally, 32-bit addressing is only needed when large amounts of RAM are needed or when a piece of software requires it. Running non-32-bit-clean software in 32-bit mode on any Macintosh can cause crashes[5] and data corruption. With MODE32 installed, holding down the Esc key on the keyboard as soon as the machine is powered on causes the system to run in 24-bit mode for the current session.[2]
Mac OS 7.6 and later require 32-bit "clean" ROMs and do not require this utility. MODE32 is a descendant of Connectix's earlier OPTIMA, which also enables 32-bit addressing but for System 6.[6] Connectix also offered three similar products, MAXIMA, RAM Doubler, and Virtual; the former implemented a RAM disk and latter two adding virtual memory (with compression in RAM Doubler's case) in addition to allowing addressing 14 MB under 24-bit addressing.[7][8][2]
^Anbinder, Mark H. (1994-06-06). "Twice the Maxima". TidBITS. Retrieved 2016-04-24.
External linksedit
32-bit Addressing on Older Macs at Low End Mac
MODE32 7.5 download at Apple
May 03, 2024
mode32, software, product, originally, developed, connectix, certain, models, apple, macintosh, published, june, 1991, originally, cost, however, september, 1991, software, made, available, free, customers, under, licensing, terms, with, apple, computer, devel. MODE32 is a software product originally developed by Connectix for certain models of the Apple Macintosh It was published in June 1991 and originally cost US 169 1 however on September 5 1991 the software was made available free to customers under licensing terms with Apple Computer 3 MODE32Developer s ConnectixInitial releaseJune 1991 32 years ago 1991 06 1 Final release7 5 September 7 1994 29 years ago 1994 09 07 2 Operating systemClassic Mac OSTypeUtility softwareLicenseProprietary commercial software later made available as freeware 1 3 Contents 1 Overview 2 Affected models 3 References 4 External linksOverview editMODE32 patches the ROM code in certain models of early 68020 and 68030 Apple Macintosh computers see Affected models below 1 which were advertised by Apple to support 32 bit memory management Despite the machines hardware being designed to support 32 bit mode the lack of a 32 bit Memory Manager in ROM forced these machines to run in 24 bit mode which crippled these otherwise high end machines to support only 8 MB of RAM 4 Prior to licensing MODE32 Apple had been subject to many complaints from individuals over the lack of 32 bit support 3 Versions of MODE32 prior to 7 5 include a control panel under Macintosh System 7 that lets the user enable or disable MODE32 1 2 The option to enable 32 bit addressing can be found in the Memory control panel when MODE32 is enabled 1 Otherwise the option is not displayed For System 7 0 and 7 1 MODE32 version 1 2 was recommended In the case of System 7 5 and if Thread Manager was loaded Connectix specifically recommends MODE32 7 5 in order to avoid problems with file corruption 2 If MODE32 1 2 was installed over 7 5 Connectix recommends a complete reinstall of the operating system 2 Generally 32 bit addressing is only needed when large amounts of RAM are needed or when a piece of software requires it Running non 32 bit clean software in 32 bit mode on any Macintosh can cause crashes 5 and data corruption With MODE32 installed holding down the Esc key on the keyboard as soon as the machine is powered on causes the system to run in 24 bit mode for the current session 2 Mac OS 7 6 and later require 32 bit clean ROMs and do not require this utility MODE32 is a descendant of Connectix s earlier OPTIMA which also enables 32 bit addressing but for System 6 6 Connectix also offered three similar products MAXIMA RAM Doubler and Virtual the former implemented a RAM disk and latter two adding virtual memory with compression in RAM Doubler s case in addition to allowing addressing 14 MB under 24 bit addressing 7 8 2 Affected models editMacintosh SE 30 Macintosh II Macintosh IIx Macintosh IIcx Other models do not need MODE32 because they either do not support 32 bit addressing at all or support it exclusively References edit a b c d e f MODE32 to the Rescue TidBITS 1991 06 17 Retrieved 2016 04 24 a b c d e f MODE32 Version 7 5 Important Release Notes and Instructions Connectix 1994 09 07 Retrieved 2016 04 24 a b c MODE32 Clean Up Those Dirty ROMs U M Computing News 6 16 Information Technology Division University of Michigan 11 1991 10 14 Retrieved 2016 04 24 System 7 MODE32 Technical Information 9 94 Apple Inc 1994 09 12 Archived from the original on 2014 05 30 Retrieved 2016 04 24 Lee Lisa 1995 MacWeek Upgrading and Repairing Your Mac Hayden Books p 516 ISBN 978 1 56830 249 2 8MB SIMMS Offered by Newer InfoWorld 13 17 InfoWorld Media Group Inc 40 1991 04 29 Retrieved 2016 04 24 Daystar Archive Mode32 FAQ LowEndMac Anbinder Mark H 1994 06 06 Twice the Maxima TidBITS Retrieved 2016 04 24 External links edit32 bit Addressing on Older Macs at Low End Mac MODE32 7 5 download at Apple Retrieved from https en wikipedia org w index php title MODE32 amp oldid 1206761480, wikipedia, wiki, book, books, library,
