Panasonic JB-3300 Technical Manual page 189

Figure 5-43 shows an operation timing chart.
*CRT ADR ___d | « |
*CPU ADR \ \ \
— 1 Wo
ST
Address
Figure 5-43 VRAM Address Control Circuit Timing Chart
(2) CRTC address selector
The CRTC address selector changes the relationship between the
CPU addresses and the CRTC addresses. Figure 5-44 shows the
CRTC address selector circuit.
LS1I53
(5-50)CMAl2
(5-50) CMA I3
(S-SE)RAI
(5-50)R AO
Ico ,
oO
Ic! 8G
1C2
Coiumn 4 Address
Column 5 Address
(5-5F) GRAPHIC
(5-5G) XSUPER
TT Oo "I
(5-6C) XCMAO ——4
Tey
(5-5F)XTEXT8O
>IND O 1 Column 6 Address
(3G) ¥CLK3 A) '
Bae, eee nee cme mines ciety em me eee me a a a
Figure 5-44 CRTC Address Selector Circuit
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