/* Imported from Wayback Machine
   Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:oc65:oc65home
   Snapshot date: 2025-12-12
   Generator    : wayback-archiver
*/

====== OC65, Overclocked 6502 Computer ======

===== Introduction =====

OC65 is a series of overclock experiments with W65C02. The first experiment is a [[builderpages:plasmo:ovrclk65|simple CPLD-6502]] test to explore the upper operating limit of W65C02. The following series of experiments were functioning computers based on [[builderpages:plasmo:crc65|CRC65]] concept to acheive fastest and producible 6502 computers.

[[builderpages:plasmo:oc65:oc65home:oc65r0|OC65 rev0]] is handwired prototype board using IDECPLD (EPM7128S protoboard) as the base and glued W65C02 then the 10nS RAM on top.[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1fa58f&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/oc65/dsc_71451215.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=200&h=114&tok=dcabb2&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Foc65%2Fdsc_71451215.jpg?200x114|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_oc65_dsc_71451215.jpg}}]]

[[builderpages:plasmo:oc65:oc65home:oc65r1|OC65 rev1]] is modified CRC65 rev2 PC board. Speed improvements are achieved with faster 10nS RAM, faster RAM decode, and fast DOM interface.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=a3a8b1&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Foc65%2Foc65home%2Foc65r1_fasterramforcrc65.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=200&h=107&tok=900acb&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Foc65%2Foc65home%2Foc65r1_fasterramforcrc65.jpg?200x107|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_oc65_oc65home_oc65r1_fasterramforcrc65.jpg}}]]