On 02/20/2013 09:47 AM, gids.rs@sasktel.net wrote:
I have one of my Freed clones running at 20Mhz :-).Yeah, Steve. I recall that Jim Lill posted some instructions on the old GEnie site for getting the card to run at 9 mHz. I followed them, and it ran at 9 mHz without a hitch. (Probably still does. I should be able to check that out in a couple of months after I resuscitate some other things.) In addition to the crystal change, the card had to be repopulated with the F version of the several chips.Has anyone ever tried upgrading a Z80+ with its far fewer chips? http://apple2info.net/index.php?title=Z-80_Plus
Unfortunately, the architecture of the traditional Softcard (of which the Z80+ is a knockoff) dictates the CPU clock (which is derived from the motherboard rather than an on-board oscillator). Not much to be done about it.