Tandy 1000 HX Technical Reference Manual page 62

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. TANDY COMPUTER PRODUCTS •
037B
037C
037D - 03D3
03D4
03D5
0 3D6
0 3D7
03D8
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
03D9
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
03DA, 03DE
Not Used
DO - Serial Data Write
Dl - EEPROM Chip Enable
D2 - Serial Data Clock
Not Used
6845 Address Register
6845 Data Register
Not Used
Not Used
Mode Select Register
High Resolution Clock
=0:
Selects 40 by 25 Alphanumeric Mode
=1:
Selects 80 by 25 Alphanumeric Mode
Graphics Select
=0:
Selects Alphanumeric Mode
=1:
Selects 320 by 200 Graphics Mode
Black and White
=0:
Selects Color Mode
=1:
Selects Black and White Mode
Video Enable
=0:
Disables Video Signal
=1:
Enables Video Signal
640 Dot Graphics
=0:
Disables 640 by 200 B&W Graphics Mode
=1:
Enables 640 by 200 B&W Graphics Mode
Blink Enable
=0:
Disables Blinking
=1:
Enables Blinking
Color Select Register
Background Blue
Background Green
Background Red
Background Intensity
Foreground Intensity
Color Select
Write Video Array Address & Read Status (3DA)
Write Video Array Data (3DE)
57

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