Editing Commodore 64 (section)

=== Commodore 64C ===
[[File:C64c system.jpg|thumb|Commodore 64C with [[Commodore 1541|1541-II]] floppy disk drive and 1084S monitor displaying television-compatible [[S-Video]] ]]

The C64's designers intended the computer to have a new, wedge-shaped case within a year of release, but the change did not occur.{{r|ieee85}} In 1986, Commodore released the 64C computer, which is functionally identical to the original. The exterior design was remodeled in the sleeker style of the [[Commodore 128]].{{r|wagner198608}} The 64C uses new versions of the SID, VIC-II, and I/O chips being deployed. Models with the C64E board had the graphic symbols printed on the top of the keys, instead of the normal location on the front. The sound chip (SID) was changed to use the MOS 8580 chip, with the core voltage reduced from 12V to 9V. The most significant changes include different behavior in the filters and in the volume control, which result in some music/sound effects sounding differently than intended, and in digitally-sampled audio being almost inaudible, respectively (though both of these can mostly be corrected-for in software). The 64&nbsp;KB RAM memory went from eight chips to two chips. BASIC and the [[KERNAL]] went from two separate chips into one 16&nbsp;KB ROM chip. The [[Programmable logic array|PLA]] chip and some TTL chips were integrated into a [[Dual in-line package|DIL]] 64-pin chip.<!--https://upload.wikimedia.org/wikipedia/commons/9/93/C64Cmotherboard.jpg U8 "252535"--> The "252535-01" PLA integrated the color RAM as well into the same chip. The smaller physical space made it impossible to put in some internal expansions like a floppy-speeder.<ref>{{cite web|title=C64C
|date=October 27, 2014
|access-date=May 2, 2016
|url=https://www.c64-wiki.com/index.php/C64C}}</ref> In the United States, the 64C was often bundled with the third-party [[GEOS (8-bit operating system)|GEOS]] [[graphical user interface]] (GUI)-based operating system, as well as the software needed to access [[Quantum Link]]. The 1541 drive received a matching face-lift, resulting in the 1541C. Later, a smaller, sleeker 1541-II model was introduced, along with the {{nowrap|800 KB}}<ref>{{cite web|url=http://fileformats.archiveteam.org/wiki/Commodore_1581_disk|title=Commodore 1581 disk – Just Solve the File Format Problem|website=fileformats.archiveteam.org|access-date=January 9, 2019}}</ref> 3.5-inch [[microfloppy]] [[Commodore 1581|1581]].