Apple-2-HW
/
micro-sci-a2-controller
mirror of https://codeberg.org/cryu/micro-sci-a2-controller
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Add CMOS construction notes.

This commit is contained in:
Christopher RYU 2023-07-29 17:47:11 +09:00
parent 819d7f47a0
commit c473345ca5
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
View File

@ -42,3 +42,5 @@ Firmware images can be built via the Makefile in the firmware subdirectory. The
## Construction notes
* 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.