Re: HC logic with 6502+rigging up a crystal

[lesherjt@vuse.vanderbilt.edu (Tilghman Lesher)]

Nathan Mates (nathan@visi.com) wrote:
: In article <515o1r$4p4@totara.its.vuw.ac.nz>,
: Rob Thomson  <rob.thomson@vuw.ac.nz> wrote:
: >Can I use a NMOS 6502 or 6522 happily with 74HC CMOS logic?

:    Should be able to do so pretty easily. The Apple I and II had a
: heck of a lot of 74xxs onboard. (Wish I had a schematic or motherboard
: handy so I could count for myself.)

: >Also, what is the best way to get from up a 4Mhz crystal to two
: >opposite 1Mhz signals. eg. what capacitors, resistors and logic
: >(latches or counters?) would I need to do this and how.

:    There should be some divide-by-2 or divide-by-4 counters in the
: 74xx series (so says the computer science major, not the electrical

MM74HC595N-ND 8-bit shift register with Output Latches 16-Dip $1.98
MM74HC597N-ND 8-bit shift register  16-Dip  $1.98

: engineer). Or, a set of flip-flips connected up correctly should
: probably do it. Once you get down to 1Mhz, then an inverter (I KNOW
: there's a 74xx for that :) will deal with that fine.

MM74HC04N-ND  Hex inverter                   14-Dip  $.68
MM74HC14N-ND  Hex inverting Schmitt Trigger  14-Dip  $.82
MM74HC4049-ND Hex inverting Logic level down Conv 16-Dip  $1.51
 

: Nathan Mates

Whether or not these part numbers have any relevance to what
Nathan was referring to, I don't know.  But I thought I'd provide
some additional, specific information.  Digi-Key part numbers.

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