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PS/1 - 2155A 24C/43C/52C/20E/39E/48E/22T/41T/50T/45V/55V System Information

Applicable to: World-Wide

PS/1 - 2155A System Information

2155A System Architecture

Consultant	24C	43C	52C
Expert	22T	41T	50T
Essential	20E	39E	48E
Processor	486SX / 33	486DX2 / 50	486DX2 / 66
Cache / Max	0 / 256KB	0 / 256KB	0 / 256KB
Video Chipset	CL-5428	CL-5428	CL-5428
VRAM / Max	512KB / 1MB	512KB / 1MB	1MB / 1MB
Disk Drives	Combo*	Combo*	Combo*
Hard Drive	253 MB	340 MB	253 MB
Memory / Max	4 MB / 64MB	4 MB / 64MB	4 MB / 64MB
Modem Speed	2400 bps	2400 bps	2400 bps
Fax Speed (s/r)	9600/4800	9600/4800	9600/4800

Investor	45V	55V
Processor	486DX2 / 50	486 DX2 / 66
Cache / Max	0 / 256KB	0 / 256KB
Video Chipset	CL-5428	CL-5428
VRAM / Max	512KB / 1MB	1MB / 1MB
Disk Drives	Combo*	Combo*
Hard Drive	253 MB	340 MB
Memory / Max	4 MB / 64MB	4 MB / 64MB
Modem Speed	2400 bps	2400 bps
Fax Speed (s/r)	9600/4800	9600/4800

*The Combo drive integrates a 5.25" and a 3.5" diskette drive into a single 5.25" enclosure.
Cache denotes installed external cache, VRAM denotes installed video memory, Memory denotes installed system memory, Max denotes maximum expandability. Fax speed is listed only on machines whose modems have fax capabilities and are listed as (Send/Receive) bps.

Regular system memory is upgraded with 36-bit or 32-bit (parity or non-parity) industry standard 70ns 72-pin SIMM chips. If the machine has 2 SIMM sockets, it can handle up to a 32MB SIMM in each socket. If it has 4 SIMM sockets, it can handle up to a 16MB SIMM in each socket.

Video drivers for these machines are available on IBM's FTP site.
You can download the Windows 3.1 driver for the CL-GD5428 chipset at ftp://ftp.pc.ibm.com/pub/pccbbs/ps1/c5426_28.exe

To upgrade cache memory on machines that have that capability (see product matrix), you will need to add either 4 (in bank 1 for 128K) or 8 (in both banks for 256K) 28-pin 32K x 8, 25ns SRAM modules. You will also need to add the appropriate TAG chip (32K x 8, 20ns SRAM for 256K ; 8K x 8, 20ns SRAM for 128K). If you are adding 256K of cache, you will also need to move the cache jumpers as shown below.

All of these machines use a standard IDE controller. This interface should support any standard IDE device. Some Enhanced IDE (EIDE) devices (namely hard drives larger than 528MB) may be able to function with the use of disk overlay software, normally supplied by the drive manufacturer, but is not supported by IBM. Though EIDE CD-ROMs are not supported on these machines, a CD-ROM with it's own ISA interface controller should work. Any ISA card (CD-ROM controller, modem, SCSI card) added to these machines needs to be non-"Plug and Play" to help insure compatability.
Machines that are capable of video memory upgrades require a 40-pin ZIP DRAM module configured as 256K x 16, which gives an additional 512K of video memory.

Processor Upgrade Matrix

Model	CPU	Upgrade Processor	Installation Notes
2155 24C	SX33	487SX, P23T-66, P24T-83	J23: 1-2, J24: 1-2, J25: 2-3
2155 22T	SX33	487SX, P23T-66, P24T-83	J23: 1-2, J24: 1-2, J25: 2-3
2155 20E	SX33	487SX, P23T-66, P24T-83	J23: 1-2, J24: 1-2, J25: 2-3
2155 43C	DX2-50	P24T-63	J23: 1-2, J24: 1-2, J25: 2-3
2155 41T	DX2-50	P24T-63	J23: 1-2, J24: 1-2, J25: 2-3
2155 39E	DX2-50	P24T-63	J23: 1-2, J24: 1-2, J25: 2-3
2155 52C	DX2-66	P24T-83	J23: 1-2, J24: 1-2, J25: 2-3
2155 50T	DX2-66	P24T-83	J23: 1-2, J24: 1-2, J25: 2-3
2155 48E	DX2-66	P24T-83	J23: 1-2, J24: 1-2, J25: 2-3
2155 45V	DX2-50	P24T-63	J23: 1-2, J24: 1-2, J25: 2-3
2155 55V	DX2-66	P24T-83	J23: 1-2, J24: 1-2, J25: 2-3

The 487SX indicates the Intel 487SX math coprocessor. The P23T-50 or P23T-66 indicates the Intel 486 Overdrive Processor (50 or 66 Mhz). The P24T-63 or P24T-83 indicates the Intel Pentium Overdrive Processor (63 or 83 Mhz). If you are installing a Pentium Overdrive processor, an EPROM upgrade is needed. If your machine has 2 SIMM sockets, the EPROM FRU is 07H0993. If your machine has 4 SIMM sockets, the EPROM FRU is 07H1001. Under installation notes (Jxx: y-z), Jxx denotes a jumper and y-z denotes its position. Some machines do not have a J24 or J25, in these cases, only check J23's position. These are the only processor upgrades supported by IBM for these machines.

Phone Support for these machines is available from IBM on a fee basis over the IBM Club's 900# (1-900-555-2582). The first minute of this call is free, each additional minute is charged to your phone bill at a rate of $2.99/minute.

	Search Keywords	PS/1, 2155A
	Hint Category	Technical Specifications
	Date Created	06-03-98
	Last Updated	19-02-99
	Revision Date	19-02-2000
	Brand	IBM Aptiva
	Product Family	PS/1
	Machine Type	2155
	Model	24C; 43C; 52C; 20E; 39E; 48E; 22T; 41T; 50T; 45V; 55V
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