SECTION 7
System Information
7-16 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
Table 7Ć8 (Continued)
BIOS Data in System RAM
Addr
Description
Size
40:4A Word
Number of video columns in memoryĊnot all columns are represented on the screen
40:4C Word
Current page size (in bytes)
40:4E Word
Current page address
40:50 8 words
Cursor position for each page
40:60 Word
Cursor display mode (start/end line)
40:62 Byte
Current display page
40:63 Word
I/O address of display hardware
40:65 Byte
Current mode select register
40:66 Byte
Current palette value
40:67 Dword
Segmented address of video option ROM
40:6B Byte
Reserved: the last interrupt that occurred
40:6C Word
Time of day counter, low word
40:6E Word
Time of day counter, high word
40:70 Byte
Timer overflow indicator
40:71 Byte
System break flag
40:72 Word
System reset flag
40:74 Byte
Reserved: last hard disk status
40:75 Byte
Number of fixed drives
40:76 Byte
Reserved: fixed disk control byte
40:77 Byte
Reserved: fixed disk port offset
40:78 4 bytes
Reserved: printer timeout table
40:7C 4 bytes
Serial timeout table
40:80 Word
Offset to start of keyboard buffer
40:82 Word
Offset to end of keyboard buffer
40:84 Byte
Number of rows on screen(24/25)
40:85 Word
Character height (bytes/char)
40:87 Byte
video control bit flags
40:88 Byte
Video feature bit flags
40:89 Byte
VGA control bit flags
40:8A Byte
Display combo code table index
40:8B Byte
Reserved: disk data rate info
40:8C Byte
Reserved: fixed disk status register
40:8D Byte
Reserved: fixed disk error register
40:8E Byte
Reserved: fixed disk interrupt flag
40:8F Byte
Reserved: disk controller info
40:90 Byte
Media type for drive 0
40:91 Byte
Media type for drive 1
40:92 Byte
Media type for drive 2
40:93 Byte
Media type for drive 3
40:94 2 bytes
Reserved: current track for each drive
40:96 Byte
Keyboard status byte
40:97 Byte
Keyboard LED status byte
40:98 Dword
Segmented pointer to user wait flag
40:9C Dword
Wait timeout dword
40:A0 Byte
Wait active flag
7. System Information
