Epson PC AX Technical Manual page 24

2.3.9
2.3.10
2.3.10.1
2.3.11
2.3.12
2.3.13
2.3.14
2.3.14.1
2.3.14.2
2.3.14.3
2.3.14.4
2.3.14.5
2.3.14.6
2.3. 15
2.4
2.4.1
2.4.1.1
2.4.1.2
2.4.1.3
2.4.2
2.4.2.1
2.4.2.2
2.4.3
2.4.3.1
2.4.3.2
2.4.3.3
2.4.3.4
2.4.3.5
2.5
2.5.1
2.5.2
2.5.2.1
2.5.2.2
2.5.3
2.5.3.1
2.5.3.2
2.5.3.3
2.5.3.4
2.5.3.5
2.5.4
2.5.5
2.5.6
2.5.6.1
2.5.6.2
2.5.6.3
2.5.6.4
2.5.6.5
2.5.6.6
2.5.6.7
2.5.7
2.5.7.1
2.5.7.2
Interrupt Control Circuit .
RO~~
Access Circuit .
Available ROM Types .
D- RÄf' 1 Refre sh Ci rcu i t .
RAM Parity Check Circuit .
Speaker Control Circuit .
Keyboard Interface Circuit
&
Other Circuit .
Keyboard Interface .
RAr-.1 Si ze Rea d; n9 .•••••••••••••..•.•...•.••......•...••
~1onitor
Setting Reading .
Disabling Keyboard Scan Codes .
Software Reset Signal Generation .
Address A20 Signal Control .
1/0 Slot Access Signal .•...............................
MULTI-FUNCTION ADAPTER (SPFG BOARD) OPERATION .
Serial Interface .
16540 Chip Select Circuit .
Interface Signal .
Data Buffer Direction Control Signal .
Parallel Data Control Circuit .
1/0 Address Selection .
Parallel Data Control Circuit Functions .
FDD Contral Circuit .
FDD Control Register Access Circuit .
Interrupt Signal and DMA Request Signal from FDC .
FDD Con t ro1 Si gn als .
Read/Wri te Ci rcu i t .
Other Functions .
KEYBOARD ••••••••••••••.••••••.•••••••••••••••••••••••••••
Block Diagram .
Interface Signal .
AT t,1ode •......••••....••.........•.••.••.••...•.•••••.
XT Mode .............................................•.
Description of Interface Signals (AT Mode) .
Clock .
Data .
Keyboa rd Data Output (AT t1ode) ........•...............
Keyboa rd Data Input (AT t1ode) .
Data Transmission Method and Data Format .
Interface Circuit Specification .
Connector Pin Explanation .
Function Specifications ...............•................
Strake Characteristics .••...••••.•••...•..•••..••••.•.
Typematic Function .
Keyboa rd Buffer .
Power On Reset (AT
~1ode)
.
Initializing (XT Mode) .....•..........................
Data Wait Function (XT Mode) .
Mode Indicator (3 LED's) Display (XT ~1ode) .
Key Scan Code .
Key Code Output (AT Mode) .
Key Code Output (XT tlode) .
2-53
2-54
2-54
2-56
2-58
2-60
2-61
2-61
2-61
2-61
2-61
2-61
2-62
2-64
2-65
2-65
2-65
2-65
2-66
2-66
2-66
2-66
2-70
2-70
2-70
2-70
2-71
2-74
2-77
2-77
2-78
2-78
2-79
2-79
2-79
2-79
2-79
2-80
2-80
2-82
2-82
2-83
2-83
2-83
2-84
2-84
2-85
2-85
2-86
2-87
2-87
2-91