add note about speed table testing

2017-03-19 16:19:37 -07:00 · 2017-03-19 16:19:37 -07:00 · 7da7a32cae
parent 6a785d5588
commit 7da7a32cae
1 changed files with 4 additions and 0 deletions
--- a/rom5x/spdtab.h
+++ b/rom5x/spdtab.h
@ -1,4 +1,8 @@
 ; speed table for 4 MHz IIc Plus
+; this was confirmed by measuring a delay loop
+; for each speed.  The delay loop was timed
+; timed to 1/100 sec accuracy using the Ram
+; Express II+ dclock.
        .byte %00000000,$00 ; 4.0000
        .byte %00100011,$33 ; 3.3333
        .byte %00010011,$20 ; 3.2000