On Mon, Apr 30, 2018 at 7:05 PM, Mia Magnusson <mia@plea.se> wrote: > Den Mon, 30 Apr 2018 15:00:41 +0200 skrev Michał Pleban > <lists@michau.name>: >> Hello! >> >> Mia Magnusson wrote: >> >> > My intention is to find some kind of suitable software for timing >> > diagrams (I was first thinking about project management software, >> > but there seems to be software especially made for thins purpose). >> >> Why not simply attaching a logic analyzer to various signals and >> measure what the real hardware does? > > Everything is made of standard 74xx circuits and standard DRAM's > (except the CPU and the CRTC) and it would be really nice to know that > the maximum and minimum delays is for each part of the circuit. (The > 6525's doesen't count in this discussion as their timing isn't critical > to understanding how the complicated CPU-RAM-Refresh-Coprocessor stuff > works). > > I wounder if anyone who designed or in general worked with the hardware > on theese machines at Commodore are still alive and remembers some > stuff? For example it would be nice to know why some signals are called > PUP1 and PUP2. look if they're static pulled up to some resistor to Vcc... PullUP1, PullUP2... Just guessing, but I use a similar naming scheme when I design my own boards. FrankReceived on 2018-04-30 20:01:33
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