TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
I/O ADDRESS
=
8C
CHIP
=
RESET TO U31
FUNCTION
=
SERIAL PARAMETER SETUP REGISTER
CONTROL
=
WRITE ONLY
bit =
7
6
5
4
3
2
1
0
baud
baud
baud
baud
extern.
Serial
select
select
select
select
trigger
data
xxxxx
xxxxx
as S3
as S2
as S1
as S0
pol.
pol.
NOTE: xxxxx data bits have no function.
bit 7, 6, 5, 4: these four bits are used to set serial baud rate. S3, S2, S1, SO select the baud rate by
same manner shown in RS-232 BAUD RATE SETUP REGISTER.
bit 3: ON
=
set external trigger direction to trailing edge.
OFF
=
set external trigger direction to leading edge.
bit 2
ON
=
set serial input data polarity to negative.
OFF
=
set serial input date polarity to positive.
I/O ADDRESS
=
90
CHIP
=
U2
FUNCTION
=
READ DATA OF SERIAL PORT
CONTROL
=
READ
I/O ADDRESS
=
91
CHIP
=
U2
FUNCTION
=
SERIAL DATA ACQUISITION CONTROL
CONTROL
=
READ AND WRITE
I/O ADDRESS
=
92
CHIP
=
U2
FUNCTION
=
READ AND WRITE DATA OF RS-232 PORT
CONTROL
=
READ AND WRITE
I/O ADDRESS
=
93
CHIP
=
U2
FUNCTION
RS-232 MODEM SIGNAL AND DATA CONTROL
CONTROL =
READ AND WRITE
The SIO chip U2 has these four I/O address registers: Address 90 and 91 are SIO Port-A registers, and 92 and 93 are SIO
Port-B registers. Control addresses 91 and 93 include three READ only and eight WRITE only internal registers. These
internal registers control and check all SIO functions.
Details of the SIO internal register functions are described in the
Z80 SIO MANUAL
by ZILOG, SHARP, MOSTEK.
7-128
Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
Page 526: ...TM 11 6625 3145 14 ...
Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
Page 532: ...TM 11 6625 3145 14 ...
Page 536: ...TM 11 6625 3145 14 ...
Page 538: ...TM 11 6625 3145 14 ...
Page 539: ...TM 11 6625 3145 14 ...
Page 540: ...TM 11 6625 3145 14 ...
Page 541: ...TM 11 6625 3145 14 ...
Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
Page 554: ......
Page 555: ...PIN 058584 ...