ACT apricot - Page 9

CONTENTS
"-.
FDC DETAIL .............................................................. 9
General ................................................................... 9
Processor Interface . ..... .. .. .. ............ ....... ...... ......... 10
Disk Drive Control ............................................. 13
Command Register ............................................. 14
Status Register ..................................................... 15
Track Register ..................................................... 15
Sector Register ..................................................... 15
Data Register ....................................................... 16
PROGRAMMING CONSIDERATIONS ............... 16
Disk Drive Selection ........................................... 16
Head Loading ....................................................... 16
Head Positioning ................................................. 17
Data Transfers ..................................................... 21
Formatting Commands ....................................... 26
Force Interrupt Command .................................. 32
INTERFACE CONNECTION DETAILS ............... 33
System Connections ............................ ............... 33
Disk Drive Connections ..................................... 35
TRACKFORMAT ................................................... 37
2-7 SERIAL INTERFACE
CONTENTS ............................................................... 1
INTRODUCTION ... ........ ...... .... ... .... ........ ....... ...... .... 1
DESCRIPTION .......... ....... ............. .... ............... ....... ... 3
General ................................................................... 3
SIO Overview ......................................................... 4
SIO Architecture .................................................... 6
Processor Interface .............................................. 10
Write Register Definition ................................... 11
Read Register Definition ..................................... 25
SIO Interrupt Sequence ....................................... 30
KEYBOARD COMMUNICATIONS ...................... 32
General ................................................................ 32
Keyboard Connector Detail ................................ 33
Channel B Programming Details ........................ 34
PARALLEL INTERFACE INTERRUPTS ........ ....... 36
RS232CCOMMUNICATIONS ............................. 37
General ................................................................ 37
RS232C Connector Detail ...................... ............ 38
Channel A Programming Details ....................... 39