Editing Macintosh Plus (section)

==Problems==
The lack of fan could cause the life of a Macintosh Plus to end early for some users. As the power supply would heat up, [[solder]] joints inside it would fracture, causing many problems, such as loss of deflection in the monitor or a complete loss of power. As in most early compact Macs, the problem was common in the yoke connector, flyback transformer, and horizontal drive coupling capacitor.<ref>{{cite web |url=http://68kmla.org/files/classicmac2.pdf |title=Classic Mac Repair Notes |website=68kmla.org |access-date=2016-05-20 |archive-url=https://web.archive.org/web/20140606214301/https://68kmla.org/files/classicmac2.pdf |archive-date=June 6, 2014 |url-status=dead }}</ref> A fan was also often added to reduce heat when the machine was upgraded to its full RAM capacity of 4&nbsp;MB.<ref>{{cite web |url=http://lowendmac.com/musings/macplus.shtml |title=Still Useful after All These Years -- The Mac Plus |website=Low End Mac |date=16 September 1998 |first=Daniel |last=Knight |access-date=May 7, 2006 |archive-date=June 27, 2006 |archive-url=https://web.archive.org/web/20060627001650/http://lowendmac.com/musings/macplus.shtml |url-status=live }}</ref>

From the debut of the [[Macintosh 128K]] through the Macintosh Plus, various third-party cooling add-ons were available to help increase airflow through the unit. [[Apple Inc.|Apple]] reorganized the compact Macintosh case to accommodate a fan with the release of the [[Macintosh SE]], which optionally included a heat-generating internal hard disk.

===ROM revisions===
The Plus went through two ROM revisions during its general market relevance. The initial ROM was replaced after the first two months as it had a serious bug which prevented the Mac from booting if an external SCSI device was powered off. The second revision fixed a problem with some SCSI devices that could send the Mac into an endless reset at [[Power-on self-test|POST]].<ref>{{cite web|date=July 1, 1987|title=Technical Note DV14: SCSI Bugs|url=https://developer.apple.com/technotes/dv/dv_14.html|url-status=dead|archive-url=https://web.archive.org/web/20041029061908/https://developer.apple.com/technotes/dv/dv_14.html|archive-date=2004-10-29|access-date=2016-05-20|website=developer.apple.com}}</ref>