IBM 7541, 7542, 7561 & 7562 Industrial Computer Enhancements https://www.ibm.com/docs/en/announcements/archive/ENUSZG90-0243

"The reliability and availability of these Industrial Computers have
been improved with the availability of an optional 180-watt Battery
backup feature. This feature allows continuous operation through brief main-power interruptions (nominal default of 10 seconds), providing
increased availability and minimizing down time."



180 Watt Battery Backup * 7541, 7542 6669 57F0842
7561, 7562
180 Watt Power Supply ** 7541, 7542 6738 57F2725
with battery backup 7561, 7562
(Field Installed)
* 7541/42 or 7561/62 above s/n 5502000 order FC6669 PN57F0842.
** 7541/42 or 7561/62 below s/n 5502000 order FC6738 PN57F2725.

IBM 7533 Industrial Computer Model B31 and Model R31 https://www.ibm.com/docs/en/announcements/archive/ENUSZG91-0116
Battery, Nicad (Internal) 6669 57F0842

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The PSU itself [sans battery] is P/N 33F5202, FRU 57F2728, made by
Plessey in 46-91

Input 95-120V 3.6A 50-60 Hz
Input 200-240V 1.9A 50-60 Hz

Code 3225-18-001 [?]

Output DC: +5V 25.6 A / +12V 3.3A / -12V 1A

Battery Charger: 26V 40mA
Max Output Power 180 W

My SWAG is the battery did not come with the PSU, but was ordered
separately. There is an external two or four pin DC power plug that
hooks over a metal loop on the outside of the PSU. Not sure why.

My DIMM memories of the PSU in the 7162 I took apart was the battery compartment at the front, below the power switch, had the actual plug
for the battery.

What the external plug is for is unknown, possumbly a case fan.

The industrial computers didn't get the love, and were kept in the dark.

I did winkle out the existence of the 7533, a 8530-286 planared
Industrial Computer.

Louis Ohland wrote:

IBM 7541, 7542, 7561 & 7562 Industrial Computer Enhancements https://www.ibm.com/docs/en/announcements/archive/ENUSZG90-0243

"The  reliability and availability of these Industrial Computers have
been improved with the availability of an optional 180-watt Battery
backup  feature. This feature allows continuous operation through brief main-power interruptions (nominal default of 10 seconds), providing increased  availability and minimizing down time."

180 Watt Battery Backup *          7541, 7542    6669     57F0842
                                   7561, 7562
180 Watt Power Supply   **         7541, 7542    6738     57F2725
with battery backup                7561, 7562
(Field Installed)
 *   7541/42 or 7561/62 above s/n 5502000 order FC6669 PN57F0842.
 **  7541/42 or 7561/62 below s/n 5502000 order FC6738 PN57F2725.

IBM 7533 Industrial Computer Model B31 and Model R31 https://www.ibm.com/docs/en/announcements/archive/ENUSZG91-0116
Battery, Nicad (Internal)                        6669  57F0842

--- SoupGate-Win32 v1.05
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Quoting myself,

"This PSU has an external, two pin Molex connector that provides power
to the case fan. There is a 9.25" (W) x 1.75" (H) hinged cover on the
lower outer side of the PSU. It is fastened at the front by a single
captive standard screw. The cover pivots open on the rear hinges,
revealing a three pin Molex power connector, like a female drive power connector. The battery cavity is 1.875" deep."

Louis Ohland wrote:

The PSU itself [sans battery] is P/N 33F5202, FRU 57F2728, made by
Plessey in 46-91

Input 95-120V 3.6A 50-60 Hz
Input 200-240V 1.9A 50-60 Hz

Code 3225-18-001 [?]

Output DC: +5V 25.6 A / +12V 3.3A / -12V 1A

Battery Charger: 26V 40mA
Max Output Power 180 W

My SWAG is the battery did not come with the PSU, but was ordered
separately. There is an external two or four pin DC power plug that
hooks over a metal loop on the outside of the PSU. Not sure why.

My DIMM memories of the PSU in the 7162 I took apart was the battery compartment at the front, below the power switch, had the actual plug
for the battery.

What the external plug is for is unknown, possumbly a case fan.

The industrial computers didn't get the love, and were kept in the dark.

I did winkle out the existence of the 7533, a 8530-286 planared
Industrial Computer.

Louis Ohland wrote:

IBM 7541, 7542, 7561 & 7562 Industrial Computer Enhancements
https://www.ibm.com/docs/en/announcements/archive/ENUSZG90-0243

"The  reliability and availability of these Industrial Computers have
been improved with the availability of an optional 180-watt Battery
backup  feature. This feature allows continuous operation through
brief main-power interruptions (nominal default of 10 seconds),
providing increased  availability and minimizing down time."



180 Watt Battery Backup *          7541, 7542    6669     57F0842
                                    7561, 7562
180 Watt Power Supply   **         7541, 7542    6738     57F2725
with battery backup                7561, 7562
(Field Installed)
  *   7541/42 or 7561/62 above s/n 5502000 order FC6669 PN57F0842.
  **  7541/42 or 7561/62 below s/n 5502000 order FC6738 PN57F2725.

IBM 7533 Industrial Computer Model B31 and Model R31
https://www.ibm.com/docs/en/announcements/archive/ENUSZG91-0116
Battery, Nicad (Internal)                        6669  57F0842

--- SoupGate-Win32 v1.05
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Vintage IBM...

180-Watt Battery-Backed Power 7541,7542 6736 250
Supply (factory-installed) 7561,7562

150-Watt (Standard) Power 7541,7542 6737 N/C
Supply (factory-installed) 7561,7562

180-Watt Battery-Backed Power 7541,7542 6738 800
Supply (field-installable) 7561,7562


Louis Ohland wrote:

IBM 7541, 7542, 7561 & 7562 Industrial Computer Enhancements https://www.ibm.com/docs/en/announcements/archive/ENUSZG90-0243

"The  reliability and availability of these Industrial Computers have
been improved with the availability of an optional 180-watt Battery
backup  feature. This feature allows continuous operation through brief main-power interruptions (nominal default of 10 seconds), providing increased  availability and minimizing down time."

180 Watt Battery Backup *          7541, 7542    6669     57F0842
                                   7561, 7562
180 Watt Power Supply   **         7541, 7542    6738     57F2725
with battery backup                7561, 7562
(Field Installed)
 *   7541/42 or 7561/62 above s/n 5502000 order FC6669 PN57F0842.
 **  7541/42 or 7561/62 below s/n 5502000 order FC6738 PN57F2725.

IBM 7533 Industrial Computer Model B31 and Model R31 https://www.ibm.com/docs/en/announcements/archive/ENUSZG91-0116
Battery, Nicad (Internal)                        6669  57F0842

--- SoupGate-Win32 v1.05
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https://www.ibm.com/docs/en/announcements/archive/ENUS193-120

Field Installable Battery (7561/7562) 6669 57F0843
106 Key Japanese Keyboard (7561-J61) 6733 57F0945
125 Key Japanese Keyboard (7561-J61) 6734 57F0946
180 Watt Battery Backed Power Supply
(IBM Installation) (7561/7562) 6736 57F2726
150 Watt Power Supply
(IBM Installation) (7561/7562) 6737 57F2727
180 Watt Battery Backed Power Supply
(Customer Installation) (7561/7562) 6738 57F2725

So, might be proof positive...

57F0843 Field Installable Battery (7561/7562)
57F2725 180 Watt Battery Backed Power Supply (Customer Installation)
57F2726 180 Watt Battery Backed Power Supply (IBM Installation)
57F2727 150 Watt Power Supply (IBM Installation)


Louis Ohland wrote:

Vintage IBM...

180-Watt Battery-Backed Power     7541,7542   6736        250 Supply (factory-installed)        7561,7562

150-Watt (Standard) Power         7541,7542   6737        N/C
Supply (factory-installed)        7561,7562

180-Watt Battery-Backed Power     7541,7542   6738        800 Supply (field-installable)        7561,7562

Louis Ohland wrote:

IBM 7541, 7542, 7561 & 7562 Industrial Computer Enhancements
https://www.ibm.com/docs/en/announcements/archive/ENUSZG90-0243

"The  reliability and availability of these Industrial Computers have
been improved with the availability of an optional 180-watt Battery
backup  feature. This feature allows continuous operation through
brief main-power interruptions (nominal default of 10 seconds),
providing increased  availability and minimizing down time."



180 Watt Battery Backup *          7541, 7542    6669     57F0842
                                    7561, 7562
180 Watt Power Supply   **         7541, 7542    6738     57F2725
with battery backup                7561, 7562
(Field Installed)
  *   7541/42 or 7561/62 above s/n 5502000 order FC6669 PN57F0842.
  **  7541/42 or 7561/62 below s/n 5502000 order FC6738 PN57F2725.

IBM 7533 Industrial Computer Model B31 and Model R31
https://www.ibm.com/docs/en/announcements/archive/ENUSZG91-0116
Battery, Nicad (Internal)                        6669  57F0842

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)