Additional Data Area - Tandy 1000 SL Technical Reference Manual

Software
Additional Data Area
HEX Offset
From Segment
0040:0000
BOH 2 words international support
B4H 1 byte
0
=
No monochrome monitor
FFH
=
Monochrome monitor
B5H 1 byte Bit 0: 0
=
DriveA is 5-1/4"
1
=
Drive A is 3-1/2"
Bit 1: 0
=
Drive B is 5-1/4"
1
=
Drive B is 3-1/2"
Bit 2:
0
=
Tandy 1000 key-
board layout
1
=
IBMkeyboard
layout
mode
mode
Bit 4:
0
=
Internal color
video support
enabled
1
=
Internal color
video support
disabled, external
color video
enabled
B i t 3
0
=
SlowCPUspeed
1
=
Fast CPUspeed
58.