IBM System/360 2050 User Manual

Selector Scan Monitor
Locations of information within the selector scan
monitor are as follows:
Main Storage
Location
5Foo
5F04
5F08
5FOC
6FOO•OE
6F01-0B
6F02-09
Local Storage
GP Register
00
09
10
11
Main Storage
Location
6603
66D7
EC Level 255458 and Above
Diagnose address of current instruction.
Current test number.
Diagnose address of previous Instruction.
Previous test number.
Output printer addresses. If none on your
system, store proper address in 6F03.
That is, 6F03-xx (active device).
EC Levels Below 255458
Bits 22 and 23 determine which selector
channel is In operation
Add one to contents of this reg to get number
of times test was executed (including failure).
May be diagnose address (current) if between
1000 and 4000. Anything outside of this range
is useless.
Contains the main storage address of the last
test number executed.
Address of output device. Normally OOE and
must be changed if this is not your printer
address.
Typewriter address. Normally 009.
To call next record from tape or disk, press reset PB and
then load PB (if then in manual state, press start PB).
Multiplexor Channel Tape or Disk
The tests for the multiplexor channel appear in the
following sequence:
1. Hardcore -- These tests check the hardware
needed for running progressive scan tests on the
multiplexor channel.
2. Common Channel -- These tests check out
the hardware in the common channel needed for
multiplexor channel operations.
3. Hardcore Check of I/O Stats, Buffer 1, and
Buffer 2.
4. Multiplexor Channel Tests -- These tests
exercise the external multiplexor channel.
The tests are arranged so that the greatest
coverage occurs in the first few series.
The first record on tape contains the multiplexor
channel progressive scan control and display pro-
gram. This program compares the logout with a
known good logout pattern for each test and displays
in indicators the information needed for trouble-
shooting when a failure is detected.
74 (3/71) Model SO FEMM
Multiplexor Channel Operating Procedure
The complete progressive scan operating procedure
for the multiplexor channel is on page MC000-02 in
Volume 1 of the ALD Maintenance Diagrams.
Multiplexor Channel Test Documentation
Hardcore and functional test documentation will take
the form of flow charts and timing charts describing
the series and the log points. These documents are
in Volume 1 of the ALD Maintenance Diagrams.
DIAGNOSTIC PROGRAMS
Figure 50 is a list of Model 50 diagnostics. Each
diagnostic is described in the documentation gener
ated for it. Standard documentation for diagnostic
programs consists of five major sections.
1. Purpose
2. Prerequisites
3. Use procedure
4. Printouts
5. Comments
Note: Disable ROS retry by jumpering 01C-
E3C4Dll to a DOB pin before running or biasing
FLT' s, diagnostics, or progressive scan.
MIDAS replaces diagnostic programs FlOlX
through F1F6X.
MIDAS Sense Switches
~
Usage
Number
~
0 Inhibit isolation
12
1 Lock CPU high 13
2 Lock CPU low 14
3-4 Unassigned 15
5-7
Isolation No. 0-7
16-17
8
Isolate
18
9
Unassigned
10 Loop isolation No. 19
In 5-7
20-31
11 Terminate
MIDAS Display Codes
..f!.!!!!..
Program interrupt
Program interrupt
SVC interrupt
Machine check
Machine check
Extemal interrupt
Test loader device
Unassigned
End report period
Extend report period
Device control
Alter output device ad-
dress
Unassigned
Unit addreu
Wait Codes
IAR Dilpiay
AAAAAA
FFFFFF
cccccc
999999
000A9A
OOOC14
000000
Input device failure on Initial load

IBM System/360 2050 Specifications

General

Brand	IBM
Model	System/360 2050
Category	Computer Hardware
Language	English