Apple-2-HW/micro-sci-a2-controller
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Add CMOS construction notes.

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Christopher RYU 2023-07-29 17:47:11 +09:00
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README.md
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@ -42,3 +42,5 @@ Firmware images can be built via the Makefile in the firmware subdirectory. The
## Construction notes ## Construction notes
* J3 can be omitted if this controller is used with a FloppyEmu * J3 can be omitted if this controller is used with a FloppyEmu
* All discrete logic ICs (except U15, the 74LS373) can be CMOS (74ACT, 74HCT). As is unfortunately usual with the Apple ][, U15 must be LS due to timing issues.
* if CMOS logic is used, then Q1/R6/R6 can be omitted -- the entire logic array can remain powered up at all times. Connect pads 1 and 3 on the Q1 footprint.