Introduction

Although the casing of the IBM 5162 XT Model 286 (XT/286) looks like a 5150 or 5160, the IBM 5162 belongs to the AT class. It is a real 16-bit 80286 like the IBM AT 5170!

Further details and information can be found in the „IBM Announcement Letters“, see below.

• My configurations
• Figures
• CPU
• BIOS
• RAM
• Landmark Diagnostic
• Overclocking to 8 MHz
• Battery
• Floppy Disk drives
• Documents
• Downloads
• External links

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My configurations

No. 1 - Very close to the original.

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 6
• BIOS: .. original IBM BIOS
• RAM: ... 512+128 = 640 KB
• CPU: ... Siemens SAB 80286-A (8 MHz)
• FPU: ... Intel 80287-3 (5 MHz)
• VID: ... IBM Monochrome Display and Printer Adapter (MDA)
• HDC/FDC: IBM Fixed Disk and Diskette Drive Adapter (2nd gen.)
• HDD: ... Seagate ST-225
• FDD: ... Panasonic JU-475 (1.2M)
• FDD: ... TEAC FD-235HF (1.44M)

Your 5162 (with original BIOS) may not work properly if the original "IBM Fixed Disk and Diskette Drive Adapter" is missing. See link no. 5.

No. 2 - A better BIOS and quieter

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 6
• BIOS: .. 286-BIOS (c)1989 AMI
• RAM: ... 512+128 = 640 KB
• CPU: ... Siemens SAB 80286-A (8 MHz)
• FPU: ... Intel 80287-3 (5 MHz)
• VID: ... IBM Monochrome Display and Printer Adapter (MDA)
• NET: ... Xircom PE3-10BT
• HDC/FDC: UNIDENTIFIED IDE PLUS-V2 with IDE disabled
• ........ FDC: Acer M5105 (r/w FM)
• OPT: ... XT-CF-Lite: XUB (ide_xt.bin, R602, 300, D800)
• HDD: ... CF 32MB (SanDisk, Industrial Grade)
• FDD: ... Panasonic JU-475 (1.2M)
• FDD: ... TEAC FD-235HF (1.44M)

The XT-CF-Lite and XUB R602 do not work for me with the original IBM BIOS (04/21/86). However, I have read a report in the Vintage Computer Forum (VCF) where it works. See below link no. 6.

No. 3 - Also runs well with colour

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 6
• BIOS: .. 286-BIOS (c)1989 AMI
• RAM: ... 512+128 = 640 KB
• CPU: ... Siemens SAB 80286-A (8 MHz)
• FPU: ... Intel 80287-3 (5 MHz)
• VID: ... OCTEK, TRIDENT TVGA 8800CS, 512KB
• NET: ... Xircom PE3-10BT
• HDC/FDC: UNIDENTIFIED IDE PLUS-V2 with IDE disabled
• ........ FDC: Acer M5105 (r/w FM)
• OPT: ... XT-CF-Lite: XUB (ide_xt.bin, R602, 300, D800)
• HDD: ... CF 32MB (SanDisk, Industrial Grade)
• FDD: ... Panasonic JU-475 (1.2M)
• FDD: ... TEAC FD-235HF (1.44M)

I don't know why, but I can't get the latest XUB release R604 to work, neither with IDE_XT.BIN nor IDE_AT.BIN. Whereas XUB R602 with IDE_XT.BIN works fine with the 2nd & 3rd configuration.

For network connections, I prefer to use the Xircom PE3-10BT adapter. Simply connect it to the parallel port, establish a connection and you can download data and programmes via FTP from your internal FTP server. It couldn't be simpler.

No. 4 - Faster, higher, farther!

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 8 -> Overclocking to 8 MHz
• BIOS: .. 286-BIOS (c)1989 AMI
• RAM: ... 512+128 = 640 KB
• CPU: ... Siemens SAB 80286-A (8 MHz)
• VID: ... IBM Monochrome Display and Printer Adapter (MDA)
• NET: ... Xircom PE3-10BT
• HDC/FDC: UNIDENTIFIED IDE PLUS-V2 with IDE disabled
• ........ FDC: Acer M5105 (r/w FM)
• OPT: ... XT-CF-Lite: XUB (ide_xt.bin, R602, 300, D800)
• HDD: ... CF 32MB (SanDisk, Industrial Grade)
• FDD: ... Panasonic JU-475 (1.2M)
• FDD: ... TEAC FD-235HF (1.44M)

No. 5 - DELOCK converter IDE to CF card

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 8 -> Overclocking to 8 MHz
• BIOS: .. 286-BIOS (c)1989 AMI
• RAM: ... 512+128 = 640 KB
• CPU: ... Siemens SAB 80286-A (8 MHz)
• FPU: ... Intel 80287-6 (6 MHz)
• VID: ... MDA, Monochrom Display Adapter
• NET: ... Xircom PE3-10BT
• HDC/FDC: TMC IFSP Multi I/O
• ........ FDC: DP8473V (r/w FM)
• OPT: ... DELOCK converter IDE to CF card
• HDD: ... (C:) SanDisk CF, 48 MB (CHS:90,16,63)
• FDD: ... (A:) TEAC FD-55GV (1.2 M, single speed)
• FDD: ... (B:) GOTEK with FlashFloppy (1.44 M)

No. 6 - inLine 2,5" IDE to DUAL Compact Flash Drive

The memory map of this configuration.

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 8 -> Overclocking to 8 MHz
• BIOS: .. 286-BIOS (c)1989 AMI
• RAM: ... 512+128 = 640 KB
• EXP: ... Intel Above Board Plus (2 MB)
• CPU: ... Siemens SAB 80286-A (8 MHz)
• FPU: ... Intel 80287-6 (6 MHz)
• VID: ... MDA, Monochrom Display Adapter
• NET: ... Xircom PE3-10BT
• HDC/FDC: TMC IFSP Multi I/O
• ........ FDC: DP8473V (r/w FM)
• ........ FDC: 4 floppy drives are supported
• OPT: ... inLine IDE to DUAL CF Drive
• FDD: ... (A:) TEAC FD-55GV (1.2 MB, single speed)
• FDD: ... (B:) GOTEK with FlashFloppy (1.44 MB)
• HDD: ... (C:) SanDisk CF, 48 MB (CHS: 90/16/63)
• HDD: ... (D:) SanDisk CF, 48 MB (CHS: 90/16/63)
• FDD: ... (E:) TEAC FD-55BV (360 KB)

The GOTEK has a „tiny“ 8GB SanDisk Cruzer Fit USB 2.0 flash drive. In theory, I could store more than 5,000 images of 1.44MB each. Of course, that is completely utopian. I think the practicable limit is 50, because I have to push through my GOTEK images with the two tiny buttons.

The third and fourth floppy disk drives are mounted via the drivers DC2.SYS and DRIVER.SYS.

No. 7 - Back to the Roots

My current, nearly original configuration.

Now (04/01/2021) that I have the remaining parts of the XT Model 286, I decided to rebuild the computer as original as possible. However, I will still use the AMI BIOS, as the original BIOS is too cumbersome. I will also keep the overclocking.

The basic version was available with a 20MB hard disk and a 1.2MB floppy disk drive. The price was about $2,500 (1986). A second 360KB floppy drive cost about $225, the 80287 math processor option $375.

• OS: .... MS-DOS 6.22
• MB: .... 83X1511 A43507 V0011
• WS: .... 0
• MHZ: ... 8 -> Overclocking to 8 MHz
• BIOS: .. 286-BIOS (c)1989 AMI
• RAM: ... 512+128 = 640 KB
• EXP: ... Intel Above Board Plus (2 MB)
• CPU: ... Siemens SAB 80286-A (8 MHz)
• FPU: ... Intel 80287-6 (6 MHz)
• OPT: ... IBM Serial/Parallel Adapter
• VID: ... MDA, Monochrom Display Adapter
• NET: ... 3Com EtherLink III, 3C509B
• HDC/FDC: IBM Fixed Disk and Diskette Drive Adapter (62X1132)
• HDD: ... Seagate ST225
• FDD: ... (A:) Y-E DATA YD-380 (1.2 MB, type 1711, 1987-48, B* white)
• FDD: ... (B:) Y-E DATA YD-580 (360 KB, type 1355, 1986-06, B♣ green)

The advantage of the TEAC drives is that they can be better screwed into the drive cage. You do not need any further tools for this. The YD drives, on the other hand, require two (on each side) additional metal plates (IBM part number 62X0643). These are used to screw the two drives together. In addition, you need another metal plate (IBM part number 62X0644) to fix the whole construction to the drive cabinet, see figure below.

When assembling the two drives, I initially made the mistake of only using the metal plate (62X0643) on one side (left). During operation, I noticed that the upper floppy turntable was grinding somewhere on the lower drive. The upper drive was not horizontal, but had sunk by approx. 1-2 mm on the right side. So I removed „everything“ again, screwed on the metal plate on the right, reinstalled everything and ... no grinding noises, everything works perfectly.

Another special feature of the YD drives is that the front bezel is smaller than that of the TEAC drives. This has the decisive disadvantage that you always have to install the TEAC drives from the front or from the outside. The YD drives can also be inserted from the inside. If you want or have to use the two metal plates (62X0643), you can no longer install the drives from the outside, the opening is too small.

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Figures

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CPU

Actually, the 5162 XT/286 should have an Intel CG80286-6 C with 6 MHz. However, a Siemens SAB 80286-A with 8 MHz is installed in my mainboard. I can't say why, and it's useless to speculate. The mainboard otherwise works perfectly.

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BIOS

IBM (original)

The two ROM's are of type 27256 (32K). But you can also use 27C256 EPROM's or Winbond W27E257 EEPROM's. I use the W27E257-12 with my GALEP-5; quick and easy to burn/erase.

Only one IBM BIOS revision was developed for the 5162. This carries the date code 04/21/86. But! You can also use a generic 286 third party BIOS for the 5162. I tested the BIOS's from AWARD and AMI.

I have tested both with the „IBM Monochrome Display and Printer Adapter (MDA)“ and the „IBM Enhanced Graphics Adapter (EGA)“, no problems. The controller and the mass storage devices such as hard disk and floppy disk also work.

IBM (modification)

There is said to be a modificated (MOD) internal IBM version dated 04/28/89, see link no. 2.

I have tested this MOD in my mainboard. The BIOS basically works, but I always get the message that my hard disk is not bootable. When I boot from floppy disk, the system starts perfectly, I can also access the hard disk and start programs from there, but just not boot! If I change the BIOS, everything works perfectly again.

The two screenshots below were taken from the merged BIOS's (EVEN + ODD).

This could actually be an internal version modified by IBM technicians, because it is noticeable that the label codes have been carried forward.

• ORIG ... U34 ... 78X7460
• ORIG ... U35 ... 78X7461
• ------------------------
• MOD .... U34 ... 78X7462
• MOD .....U35 ... 78X7463

The IBM 5162 was launched in 1986. In 1989, three years had passed and a large number of new, larger hard disks had come onto the market in the meantime. The IBM 5162 could keep up with the speed (6 MHz, 0 WS) of the first 5170 (8 MHz, 1 WS). So why not change the BIOS a little, that costs nothing, and use the modified 5162 for a few more years.

The modified BIOS has 38 hard disk types instead of the original 24, whereby type 15 does not actually exist.

Look at the following figure. Don't the numbers look familiar? These are the generally known hard disk types 1 and 2

• 32 01 04 00 - 0132 0004 - 306/4 - type 1
• 67 02 04 00 - 0267 0004 - 615/4 - type 2

With a little skill, you could also enter your own values here. Then you have to separate the combined BIOS into EVEN and ODD again and finally burn it, see below link no. 4.

AWARD

IBM COMPATIBLE 286 BIOS
COPYRIGHT Award Software Inc. 10/20/87
286 Modular BIOS Version 3.03GS

This BIOS has the advantage that it has an in-built SETUP routine (CTRL+ALT+ESC). Furthermore, you can also select a 1.44MB drive in this setup. This is NOT possible with the original BIOS.

AMI

286-BIOS (c)1989 American Megatrends Inc
D286-1277-033089-K0

With this BIOS the start screen and SETUP correspond in content and view to the BIOS that you know from back that time.

I use the AMI BIOS (03/30/89), because you can access the SETUP very easily and the operation with the XT-CF-Lite (XUB R602) adapter works well. The BIOS is Y2K capable.

In addition to the actual SETUP, there is also a DIAGNOSTICS screen. Here you can, among other things, perform a low-level format for the hard disk; with AUTO INTERLEAVE DETECTION.

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RAM

The RAM of the 5162 is made up of two components:

1. 000 KB - 512 KB (512 KB): 2x SIMM, each 256K-by-9
• standard 30-pin, 256KB, with parity, 150ns (or faster), 256cycle/4ms refresh
• ... Mitsubishi: MH25609BJ-15, 9x M5M4256J-15 *)
• ... Mitsubishi: MH25609BJ-15, 9x M5M4257J-15 *)
• ... Mitsubishi: MH25609J-10, 9x M5M4256AJ-10 *)
• ... will be supplemented ...
2. 512 KB - 640 KB (128 KB): 4x 64K-by-4 (data), 2x 256k-by-1 (parity)
• ... U1, U4: ......... D41256-15
• ... U2, U3, U5, U6: . D41464-12

*) I have tested these SIMM modules. See also link no. 3.

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Supersoft - Landmark Diagnostic

This test is a little bit tricky, but it works if you are prepared for it. You can use the ROM's for the 5170 for this test. Please read this detailed page from minuszerodegrees carefully. Important are the „first 20 seconds“ and the graphics card! But even if you have passed this hurdle, you may still hear a „beep concert“ during some tests, so don't be surprised!

I made the test with the IBM Enhanced Graphics Adapter (EGA). Do NOT use the IBM Monochrome Display and Printer Adapter (MDA). You will see and hear nothing!

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Overclocking to 8 MHz

After some research in the VCF I decided to tune up my IBM 5162 mainboard from 6 to 8 MHz.

1. Crystal Y1: 12 MHz to 16 MHz
2. BIOS: AMI 1989 (WINBOND W27E257-12)
• With the BIOS EPROM/EEPROM, 150ns should actually be sufficient. Even my PII MSI MS-6117 board only has a -15 chip!
3. CPU: 80286-6 to 80286-8
• Since I already use a 8 MHz CPU (Siemens SAB 80286-A), this step was not necessary for me.
• see below link 8, 9, 10 and 11
4. NPU: Intel 80287-6 (6 MHz)
• According to minuszerodegrees the clock generation in the 5162 is different from the 5170 mainboard. But so far there have been no problems.
• see below link 8, 9, 10 and 11
5. RAM: 150ns to 100ns
1. 000 KB - 512 KB (512 KB):
• ... 2x Mitsubishi: MH25609J-10, 9x M5M4256AJ-10 *)
2. 512 KB - 640 KB (128 KB):
• ... U1, U4: ......... NEC D41256C-10
• ... U2, U3, U5, U6: . NEC D41464C-10
• Whether this is necessary, I do not know ¯\_(ツ)_/¯
• On minuszerodegrees.net you can read that the 5170 with 8 MHz also only needs 150ns chips. Well then. I have installed 100ns RAM's throughout.

The (new) crystal frequency chosen should be twice (16 MHz) the required internal processor clock frequency (8 MHz). The crystal should have a typical load capacitance of 32 pF.
1985, Siemens Industrial IC Data_Book, p.558

The clock generator at location U79 (Siemens SAB 82284P) is also interesting. According to the Siemens manual the SAB 82284 generates a 8 MHz system clock for SAB 80286 Processors.

The 82288 bus controller at location U68 does not need to be replaced either, as the 8MHz version (D82288-8) is already installed here.

So far I have had no problems with my 8 MHz version of the IBM 5162 mainboard. Mind you, this could be quite different with your mainboard!

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Battery

This chapter is now (04/02/2021) obsolete because I have an original cabinet and no longer need this auxiliary construction.

In the IBM XT/286 (5162) a 6V battery of the type BR-P2 or CR-P2 is built-in. Since I only own the mainboard, I had to find a replacement. I bought an external case for four 1.5V batteries of type AAA Micro LR03 in an electronics shop and off you go.

Note: If you replace the battery you have to go thru the SETUP procedure. This is no problem with the AMI BIOS with a built-in SETUP!

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Floppy Disk Drives

My experience with the YD-580 is that the white nylon cone does not lock an inserted floppy exactly in the centre. As a result, the diskette is almost impossible to read/write. So far I have been able to solve this problem by carefully moving the locking lever up and down several times. With this movement, I could then centre the floppy disk as usual. This problem is also described in the VCFED forum, see below.

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Documents

• Announcement Letter 186-161 / September 1986
• Announcement Letter ZG86-4031 / October 1986

Downloads

• minuszerodegrees.net: Images of BIOS ROM's for IBM ...
• xtideuniversalbios.org: XTIDE Universal BIOS's (XUB)

External links

1. Vintage Computer Forum (VCF): IBM XT/286 (5162) - 201 RAM Error
2. Vintage Computer Forum (VCF): IBM 5162 BIOS dated 1989-04-28
3. Vintage Computer Forum (VCF): 5162 XT/286 SIMMs
4. Vintage Computer Forum (VCF): 5160 and 5162 HDDs tables
5. Vintage Computer Forum (VCF): XTIDE Universal BIOS v2.0.0 beta testing thread / 5162
6. Vintage Computer Forum (VCF): IBM XT-286 5162 speedup
7. Vintage Computer Forum (VCF): FDD YD-580 holding shake
8. minuszerodegrees.net: Known problem - POST error of 601
9. minuszerodegrees.net: IBM 5170 - Motherboard Diagrams - Clock generation
10. minuszerodegrees.net: IBM 5170 - Motherboard Diagrams - Relationship between CPU/NPU internal clocks
11. minuszerodegrees.net: IBM 5162 - Motherboard Diagrams - Clock generation
12. minuszerodegrees.net: IBM 5162 - Motherboard Diagrams - Relationship between CPU/NPU internal clocks