Ok try now the latest FW. Oddly enough the Tandy 1000 suffers from the same ill but the MM1988 runs in native tandy mode this is why I didn't notice it before.
Well Old CGA and Tandy 1000 generates the CYAN/MAGENTA in low intensity for both palletes: low and high. You don't get light cyan/ light magenta on it as expected on a new CGA or EGA clones.
But I will be probably generating the wrong colors, so please type this program below on basica and take a picture of the composite output (CRT) of the screens - press enter for each screen:
(no my Tandy 1000 generates funky composite colors)
10 CLS
20 SCREEN 1
30 FOR X = 0 TO 63
40 FOR C = 0 TO 3
50 LINE(X*2,C*32)-(X*2,(C+1)*32-1),C
60 FOR I = 0 TO 3
70 LINE(X*2+1,C*32+I*8)-(X*2+1,C*32+(I+1)*8-1),I
80 NEXT I
90 NEXT C
100 NEXT X
110 OUT &H3D9,0
120 IF INKEY$=""THEN 120
130 OUT &H3D9,16
140 IF INKEY$=""THEN 140
150 OUT &H3D9,32
160 IF INKEY$=""THEN 160
170 OUT &H3D9,48
180 IF INKEY$=""THEN 180
200 GOTO 110