home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
HPAVC
/
HPAVC CD-ROM.iso
/
pc
/
PCTIMING.ZIP
/
FIGURES.ZIP
/
FIG1.GIF
next >
Tile
Graphics Interchange Format
|
1996-02-01
|
14.6 KB
|
911x645
|
1-bit (2 colors)
ocr:
Software interface 8253/8254 CTC (ports 40h - 43h) 14.31818 MHz IRQO (int 8) (BIOS) oscillator Channel 0 int 1Ch (BIOS) Refresh Channel 1 TF-F detect Divide by 12 Timer 2 Channel 2 To PPI or read-back 1.19318166666... MHz AND Speaker equivalent data Timer 2 gate Speaker 32768 Hz Software interface crystal (ports 70h, 71h) RTC/CMOS Backup battery - IRQ8 (int 70h) MAIN TIMING SOURCES ON THE PC
