Desktop and Tower Systems

Model	Type	CPU	RAM	MAX	Socket	BUS	Drive interface	Video
PS/55 started with model 5571- S. this model should be listed first.
5571	-Sxx	386DX-16	2MB		2	32Bit x3 16Bit x5	ESDI	Display Adapter
5571	-Txx	386DX-20	4MB	8MB	2	32Bit x3 16BIt x5	ESDI	Display Adapter -II
5571	-V0x	386DX-25	4MB	8MB	2	32Bit x4 16Bit x4	ESDI	Display Adapter -II
5571	-V1x	386DX-25	4MB	8MB	2	32Bit x4 16Bit x4	Long 16bit SCSI	Displaly Adapter-II
Desktop Models
5551	-Sxx	386DX-16		8MB	3		ESDI	Displaly Adapter-II
5551	-Txx	386DX-20		8MB	3		ESDI	Displaly Adapter-II
5551	-V0x	386DX-25		8MB	3		ESDI	Displaly Adapter-II
5551	-V1x	386DX-25		8MB	3	32Bitx2 16Bit x2	ESDI	Displaly Adapter-II
5551	-V2x	386DX-25		8MB	3	32Bit x3 16Bit x2	ESDI	Displaly Adapter-II
5510	-Txx	386DX-25				x3	ESDI	VGA
5510	-Sxx	386SX-16	Not MCA. These have ISA BUS. Clasified to PS/55Z					VGA
5510	-Zxx	286-12
5540	-Txx	386DX-20	4MB		4	32Bit x2 16Bit x1	ESDI	?
5551	-W0x	486SX-20	4MB	32MB	4	32BIt x5	Short 16Bit SCSDI	DBCS D/A /J
5551	-W2X	486DX2-40	4MB	32MB	4	32BIt x5	Short 16Bit SCSDI	DBCS D/A /J
5551	-N0A/NAB/NAE	486DX2-66	4-16MB	32MB	4	32BIt x5	32Bit SCSI w Cache on the planar	DBCS D/A /J
5551	-NXB/NMB	486DX2-66	8-16MB	32MB	4	32BIt x5	32Bit SCSI on the planar	XGA-2
5551	-Yxx	486DX-33		32MB	4	32BIt x5	32Bit SCSI on the planar	DBCS D/A /J
5551	-R1D	486DX2-66	4MB	32MB	4	32BIt x5	E-IDE	DBCS D/A /NI-J
5551	-RXD	486DX2-66	8MB	32MB	4	32BIt x5	E-IDE	XGA-2
5551	-RXE/RED/RME	486DX2-66	16MB	32MB	4	32BIt x5	EIDE + SCSI/32A	XGA-2
5551	-L1C	486BL2-66	4MB	32MB	4	32BIt x5	E-IDE	DBCS D/A /NI-J
5551	-LXC	486BL2-66	8MB	32MB	4	32BIt x5	E-IDE	XGA-2
5551	-LEC	486BL2-66	8MB	32MB	4	32BIt x5	E-IDE + SCSI 32/A	XGA-2
5521	-Y1B	486DX-33	4MB	32MB	4	32BIt x5	E-IDE	DBCS D/A /NI-J
5521	-YSX/YWB	486SX33	4MB	32MB	4	32BIt x5	E-IDE	SVGA, CL 28 1MB
5561	-W0x	486DX-25	4MB	64MB	8	32Bit x 6	SCSI /16A	D/A-B II
5561	-W1x	486SX-25	4MB	64MB	8	32Bit x 6	SCSI /32A w Cache	D/A-B II
5561	-W2x	486DX2-50	4 -8MB	64MB	8	32Bit x 6	SCSI /32A w Cache	D/A-B II
5561	-Nxx	486DX2-66	8-16MB	64MB	8	32Bit x 6	SCSI /32A w Cache	D/A-B II
In-a-box, Integrated Display			5530-S/T look like 8525 but all 5530 are MCA
5530	-S0x	386SX-16		4MB		16Bit x3	ESDI	Stage-I
5530	-S1x	386SX-16		6MB		16Bitx3	ESDI	Stage-II
5530	-Txx	386DX-20		6MB		32Bit x3	ESDI
5530	-U0x	386SX-20			3	16Bit x4	ESDI	XGA
5530	-UAx	386SLC-20			3	16Bit x4	ESDI	XGA
5530	-V0x	386SLC-20			3	16Bit x4	ESDI
5530	-V28/VAB/ -VX8/VXB	486SLC2-40	4-8MB	16MB	3	16Bit x4	ESDI	D/A IV XGA-2 for -VXx
5530	-Wxx	486SX-20	4-8MB	32MB	4	32Bit x4	Short 16Bit SCSI
5530	-W2x	486DX2-40	4-8MB	32MB	4	32Bit x4	Short 16Bit SCSI
5530	-Lxx	486BL2-66	4MB	32MB	4	32Bit x4	E-IDE	DBCS D/A /NI-J
5530	-LXC	486BL2-66	4MB	32MB	4	32Bit x4	E-IDE	XGA-2
486 Tower ( Server Model )
5580	-Yxx	486DX-33	4-8MB	64MB	8	32Bit x8	Long 32Bit SCSI w/c	D/A B-II
5580	-W0x	486DX-25	4-8MB	64MB	8	32Bit x8	Long 32Bit SCSI w/c	D/A B-II
5580	-W2x	486DX2-50	4-8MB	64MB	8	32Bit x8	Long 32Bit SCSI w/c	D/A B-II
8595	-Jxx	486DX-50	16MB	64MB	8	32Bit x8	Long 32Bit SCSI w/c	D/A B-II
9585	-5Nx	486DX2-66	8MB	64MB	8	32Bit x8	F/W SCSI-2 on the planar.	XGA-2
9585	-5Kx	486DX-33	8MB	256MB	8	32Bit x8	Ditto	XGA-2
9595	-6Nx	486X2-66	16MB	256MB	8	32Bit x8	F/W SCSI-2	XGA-2
9595	-5PT	P-60	16MB	256MB	8	32Bit x8	F/W SCSI-2	XGA-2
9595	-5QT	P-60	16B	256MB	8	32Bit x8	F/W SCSI-2	XGA-2
9595A	-8NT	486DX2-66	16MB	256MB	8	32Bit x8	Raid, Passplay	XGA-2
9595A	-8PT	P-60	16MB	256MB	8	32Bit x8	Raid, Passplay	XGA-2
9595A	-8QT	P-66	16MB	256MB	8	32Bit x8	Raid, Passplay	XGA-2

Model numbers in pink colored cells are classified as PS/55Z
For model 5538 PS/55E, click HERE.

Laptops, Notebooks, Lunch Boxes

Model	sub name	US, EMEA	CPU	RAM Max	Interface	Display
5523	PS55/note	N33 ?	80386SX-12	6MB	IDE, AT	9.5" Mono VGA
5523	PS/55note N23SX	N33SX	80386SX-16	6MB *1	IDE, AT	9.5" Mono VGA
8551	PS/55 note N51SX	N51SX	80386SX-16	10MB	ESDI, MCA	9.5" Mono VGA
8551	PS/55 note N51SLC	?	386SLC-16	10MB	ESDI, MCA	9.5" Mono VGA
5527	PS/55note N27SX	CL57SX , 8554	80386SX-16	16MB IC DRAM	ESDI, MCA	10.4" TFT, 16C
9552-Y	PS/55note C52 486SLC	TP700	486SLC-25	16MB IC DRAM	ESDI, MCA	10.4" TFT, 256C
9552-J	TP720C	TP720C	486SLC2-50	16MB IC DRAM	ESDI, MCA	10.4" TFT, 256C
5535-Sxx		Poss None	80386SX-16			9.5" Mono VGA
8543	PS/55note L40SX	L40SX	80386SX-20	18MB	IDE, AT	PS/55 Hi-Reso
5545-T		P70-386	80386SX-20		MCA	Plusma, PS/55 Hi-Reso

Cross reference of the models between PS/2 and PS/55

PS/2	PS/55	Remarks
8570	5551-S/T/V	5551 is wider than PS/2 for 1 added AVE BUS slot
8580	5571	Possibly same, except BIOS ROM
8590/9590	5561	72pin SIMM sockets x8 are mounted on the planar directly. No XGA on the planar.
8595-xKx	5580-Yxx	All 5580 use 1S1P planar
8595-xMx	8595-Jxx	Same except coding. Type-3 50MHz complex.
9585	9585	Same except coding.
9595 Type 4	9595-xxx	Coding is almost same between PS/2 and PS/55. All PS/55 9595 use 2S2P planar and Type 4 complex.