On 03/08/2014 11:34 PM, Jim Brain wrote: > I'm awaiting a few 5V XC9536-10 (yep, actual 5V Xilinx logic CPLD) ICs, > and am hopeful to try it out. I need to test and see if the unused bits > on the 6523T databus read as 0, or are truly undefined. They are probably open pads on the die which is either a 6525 or 6523 die in a 28pin DIP. So they should behave as open Pins on a normal I/O chip. If set to input in the DDR they should read as '1' and if set to output in the DDR, they should read back as whatever you wrote into the output register. So in other words, define the full 6523 and then just package it as a 6523T. Would also mean that we'd have the 6523/6525 in the 1551 covered as well. :) Gerrit Message was sent through the cbm-hackers mailing listReceived on 2014-03-08 23:00:43
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