I am especially uncertain about the 65C22. I guess it might have helped if I coded "in the old days"; or for that matter, now. I suppose I should put together a plan for my PCB clock circuit (and gather the parts too!).
With regard to I/O, I think Garth's plan (
http://wilsonminesco.com/6502primer/pot ... ml#BAS_CPU ) seems wisest to me. Generic pin headers. That way, any ol' connector might be interfaced. I might also make certain there's some kind of I2C bus, too. I think I saw some nifty I2C connectors on a thread here, somewhere. As a minimal system, that should suit my needs.
I don't think the Phi2 thing mentioned affects me? I think I just used 74HC138s and a 74HC311?( 3-input AND); I don't think that will cascade too much and mess with clock or synchronization. bUt I just read the sentence "You must have a way of making sure microprocessor cannot write to RAM while Phi2 is low" and now I must read that section again!
I still have to put some R/W lines and OE and CE and other things on my PCB plan. Being new to this, I definitely need to look at all the timing diagrams (I am no stranger to music, symphonies, orchestration and such! Should be easy!).
I have become sidetracked, today, by physics. Still curious about light computers and Moore's Law. Seems not all speeds of light are equal (hahaha! I knew that; index of refraction is ratio of speeds of light). I know you 6502-ers like new projects. Any 6502 optical-instantiations out there? (just 3,500 transistors, right?
https://commons.wikimedia.org/wiki/File ... S_6502.jpg ). Maybe I'll leaf through my Edmund Optics catalog and try to build one for less than $1000 (optics are EXPENSIVE!). I guess I am OT (off topic), but the subject of delay is on my mind.
(In the following table, c refers to the speed of light in a vacuum,
or 300,000 kilometers per second.
Medium Propagation Speed
------ -----------------
Thick Coax .77c (231,000 km/sec)
Thin Coax .65c (195,000 km/sec)
Twisted Pair .59c (177,000 km/sec)
Fiber .66c (198,000 km/sec)
AUI Cable .65c (195,000 km/sec) )
http://stason.org/TULARC/networking/lans-ethernet/3-11-What-is-propagation-delay-Ethernet-Physical-Layer.html#.VltIAL-YG5IAnd:
https://en.wikipedia.org/wiki/Velocity_factor"
VF% Transmission line
95-99 Open-wire "Ladder" Line
80 Belden 9085 twin-lead
82 RG-8X Belden 9258 coaxial cable (foamed polyethylene dielectric)
66 RG-213 CXP213 coaxial cable (solid polyethylene dielectric) "
And:
https://en.wikipedia.org/wiki/Fiber-optic_communication#Record_speeds"
In 2013, New Scientist reported that a team at the University of Southampton had achieved a throughput of 73.7 Tbit per second,
with the signal traveling at 99.7% the speed of light through a hollow-core photonic crystal fiber.[14] "