Peritek VCD-V, User Manual

Page: 121 / 183

Peritek
Programming On-board Devices and Memories 5-25
Table 5-12 34020 and VMEbus Register Offsets(VCTLAR = 400)
VMEbus Byte
TMS34020 Offset from
Address DBRBase
high low Address
Principal analog color map
(BT459 - VCD-V, BT468 - VCU-V, BT463 - VCT-V)
Address Register (low byte) C080 0 3
Address Register (high byte) C080 20 7
Data Buffer for control, cursor, overlay C080 40 B
Data Buffer for primary color palette C080 60 F
BT482 Alternate Color Map (low resolution VCD-V only)
Write Address Register (primary cursor RAM) C080 0 3
Data Buffer (primary) C080 20 7
Primary Palette Mask Register C080 40 B
Read Address Register (primary cursor RAM) C080 60 F
Write Address Register (overlay cursor color) C080 80 3
Data Buffer (overlay) C080 A0 7
Command Register A C080 C0 B
Read Address Register (overlay, cursor color) C080 E0 F
8242PC Keyboard Controller
Data Buffer C080 100 23
Control/Status Register C080 120 27
BT431 cursors A and B, (VCT-V and VCD-V Digital)
Address Register Low C080 y00 n3
Address Register High C080 y20 n7
Bitmap Data Buffer C080 y40 nB
Control Data Buffer C080 y60 nF
n = 4 for cursors A,B; 8 for cursor A; C for cursor B
y = 2 for cursors A,B; 4 for cursor A; 6 for cursor B