David C Chiu wrote:
But how does this mod effect the peripheral bus? Is the peripheral bus clock driven from the same oscillator as the CPU on the IIc+?No there is a 14. something mhz osc on the motherboard... the //c+ License the zip Chip technology and used it on the //c+ MB"Michael J. Mahon" <mjmahon@aol.com> wrote in message 4oKdnaKrB5aRtsLeRVn-hw@comcast.com">news:4oKdnaKrB5aRtsLeRVn-hw@comcast.com...brad wrote:saw this //c plus for sale on ebay...he posted a pic of making it an 8mhz mod using the 14mhz wdc chip and a crystal change here is the link? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5823223830&fromMakeTrack=trueIt works. I believe that Wayne (?) has modded his to an even higher speed. Think of it as an "unpotted" Zip Chip. This is the first I've heard of having to upgrade the 65C02 to get it to run faster. Apparently the ones they used in //c+ machines were already high-speed capable.