Tandy 1000 HX Technical Reference Manual page 63

• TANDY COMPUTER PRODUCTS
READ (3DA)
00 Bit 0
00 Bit 1
00 Bit 2
00 Bit 3
00 Bit 4
01 Bit 0
01 Bit 1
01 Bit 2
01 Bit 3
02 Bit 0
02 Bit 1
02 Bit 2
02 Bit 3
02 Bit 5
03 Bit 0
03 Bit 1
03 Bit 2
03 Bit 3
03 Bit 4
03 Bit 5
10-lF Bit 0
10-lF Bit 1
10-lF Bit 2
10-lF Bit 3
Bits 4 - 7
03DB
03DC
03DD
Bit
0
1
2
3
4
5
6
7
Display Inactive
Light Pen Set
Light Switch Status
Vertical Retrace
Not Used
WRITE (3DE)
Not Used
Not Used
Not Used
Not Used
Not Used
Palette Mask 0
Palette Mask 1
Palette Mask 2
Palette Mask 3
Border Blue
Border Green
Border Red
Border Intensity
Reserved = 0
Mono Enable = "1"
Reserved = 0
Border Enable
4-Color High Resolution
16 Color Mode
Extra Video Mode
Palette Blue
Palette Green
Palette Red
Palette Intensity
Not Used
Clear Light Pen Latch
(Not Used on Tandy 1000 HX)
Preset Light Pen Latch
(Not Used on Tandy 1000 HX)
Extended Ram Page Register - CPU Relative
Description
Extended Addressing Modes
Not Used
Not Used
CRT Video Page Address "17"
CRT Video Page Address "18"
CPU Page Address "17"
CPU Page Address "18"
Select 64K or 256K Ram
58