IBM System/360 2050 User Manual

•Manual Operation--------- Addr- Keys--------------- Address Keys
°""'P Storage Poths
24 25 22 23 26 27 28 29 30 31
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1
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•ROS Operation -- -
Mover Latches I CE Field---------------Mover Latches
Main Storoge P h at s
{
SAR
Co pocity
10 M~220
K~2
Storage Addr
Register (SAR
Storage Addr
Bits (SAS)
ess
)
-
ess
8
B
B
AOB (8-31)
IAR (8-31)
8 9 10
11 12
~ ~
~ ~ ~
~
00
...
N
-
8
9
10 11
12
BSM Select
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0
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IJ
13 14 15 16 17
c
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6
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0
0
0 0
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-
13 14 15 16 17
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14
13
12
2 3
4
5
6
7
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T 1
I I II
18 19
20
21 22 23 24 25 26
27 28 29
30
31
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18 19
20 21
22 23
24
25 26
27
28 29
30
31
11
10 9
8
7
6 5
4
3
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1 0
I Decode Functions
R;.
)(
Y Drivers
Y Gates
x
X Gates
Only
I
Dvr
Drivers
w
Main Storage
I
L __________
-
-~211-
sT4fiT1- 2_11
~~211-
t
I
Decode Values
4
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Bump Storage Only_.....
.... s_ T __ r:..·:.od~ ~n~i~s- _
R;.
x
8
x
X Gates
w
~vr
Gt
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af4-r2~-
..... _________
Decode Values
4
y
2 1
I
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L Drive Line (0 or 1 /
I I
Main or Bump - L.l __________ -LI s::.;:~:.;;~e::.;:gc;;_t .Al _________________ __,l_s_yt_es___,
•These operations bring up microorders [w, E -A; or W, E -A (SJ] which tum on the B bit in SAR.
FIGURE 54. MAIN AND BUMP STORAGE ADDRESSING
Exercise Bump Storage
To exercise the bump storage portion of main stor-
age, tie 01A-BlH7B12 (SAR B Bit) to ground before
running any main storage diagnostic.
Continually Address One MS Location
To address a single main storage location continually,
the following ROS routine 202 (QWl 11) may be used:
1. Set IC to the selected address.
2. Place ROS repeat switch in down position.
3. Set data keys to ROS routine 202, and press
start pushbutton.
Scan MS for Bad Parity
A simple program for a full storage scan, checking
for bad parity, follows:
Location
0
-
00000000
Location 4
-
00000008
Location
8
-
41101004
Location c - 02041000
Location 10
-
100047FO
Location 14
-
00080000
GP-1 should contain hex 18
82 (3/71.) Model SO FEMM
This program will scan storage to the error.
With the check switch in the stop position, the ma-
chine will stop and the failing address will be indi-
cated in SAR, SDR will contain the bad data, but the
storage location will have been changed by the
program.
Bit Arrangement of MS Word
A full word in main storage is arranged as follows:
Bits 0-7
Bits 8-15
Bits 16-23
Bits 24-31
Bit 32
Bit 33
Bit 34
Bit 35
Byte 0
Byte 1
Byte 2
Byte 3
Parity for byte O
Parity for byte 1
Parity for byte 2
Parity for byte 3
Check Strobe of Main Storage
To check the main storage strobe, use the following
procedure:
1. Use pin B1J4J09 (ALD MC051) in the main
storage frame as the test point for strobe A. This
is the bit eight (segment A or C) pre-amp output.

IBM System/360 2050 Specifications

General

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