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PS/55 Model-Type Chart

Desktop and Tower Systems
Laptops, Notebooks, Lunch Boxes
PS/2 and PS/55 Cross-reference
PS/55 Codenames

Desktop and Tower Systems

Model Type CPU RAM Slots Drive Interface Video
Std. Max. #
Desktop Models
5510 Txx 386DX-20 2/6 MB 14 MB 32-bit x2
16-bit x1		 ESDI VGA for -Tx4
XGA for -Tx8
5510 Sxx 386SX-16 2/6 MB 6 MB 4 ISA x3 VGA
5510 Zxx 286-12 1 MB 5 MB 4 ISA x3 VGA
5521 Y1B 486DX-33 4 MB 32 MB 4 32-bit x5 EIDE DBCS DA /NI-J
5521 YSX/YWB 486SX-33 4 MB 32 MB 4 32-bit x5 EIDE SVGA, CL 28 1 MB
5540 Txx 386DX-20 4 MB 4 32-bit x2
16-bit x1		 ESDI ?
5551 Sxx 386DX-16 8 MB 3 ESDI DA II
5551 Txx 386DX-20 8 MB 3 ESDI DA II
5551 V0x 386DX-25 8 MB 3 ESDI DA II
5551 V1x 386DX-25 8 MB 3 32-bit x2
16-bit x2		 ESDI DA II
5551 V2x 386DX-25 8 MB 3 32-bit x3
16-bit x2		 ESDI DA II
5551 W0x 486SX-20 4 MB 32 MB 4 32-bit x5 Short 16-bit SCSI DBCS DA /J
5551 W2X 486DX2-40 4 MB 32 MB 4 32-bit x5 Short 16-bit SCSI DBCS DA /J
5551 N0A/NAB/NAE 486DX2-66 4-16 MB 32 MB 4 32-bit x5 32-bit SCSI w/c (planar) DBCS DA /J
5551 NXB/NMB 486DX2-66 8-16 MB 32 MB 4 32-bit x5 32-bit SCSI (planar) XGA-2
5551 Yxx 486DX-33 32 MB 4 32-bit x5 32-bit SCSI (planar) DBCS DA /J
5551 R1D 486DX2-66 4 MB 32 MB 4 32-bit x5 EIDE DBCS DA /NI-J
5551 RXD 486DX2-66 8 MB 32 MB 4 32-bit x5 EIDE XGA-2
5551 RXE/RED/RME 486DX2-66 16 MB 32 MB 4 32-bit x5 EIDE + SCSI A/32 XGA-2
5551 L1C 486BL2-66 4 MB 32 MB 4 32-bit x5 EIDE DBCS DA /NI-J
5551 LXC 486BL2-66 8 MB 32 MB 4 32-bit x5 EIDE XGA-2
5551 LEC 486BL2-66 8 MB 32 MB 4 32-bit x5 EIDE + SCSI A/32 XGA-2
5561 W0x 486DX-25 4 MB 64 MB 8 32-bit x6 SCSI A/16 DA-B II
5561 W1x 486SX-25 4 MB 64 MB 8 32-bit x6 SCSI A/32 w/c DA-B II
5561 W2x 486DX2-50 4-8 MB 64 MB 8 32-bit x6 SCSI A/32 w/c DA-B II
5561 Nxx 486DX2-66 8-16 MB 64 MB 8 32-bit x6 SCSI A/32 w/c DA-B II
Tower Models
5571 Sxx
(the first PS/55)		 386DX-16 2 MB 2 32-bit x3
16-bit x5		 ESDI DA
5571 Txx 386DX-20 4 MB 8 MB 2 32-bit x3
16-bit x5		 ESDI DA II
5571 V0x 386DX-25 4 MB 8 MB 2 32-bit x4
16-bit x4		 ESDI DA II
5571 V1x 386DX-25 4 MB 8 MB 2 32-bit x4
16-bit x4		 Long 16-bit SCSI DA II
5580 Yxx 486DX-33 4-8 MB 64 MB 8 32-bit x8 Long 32-bit SCSI w/c DA B-II
5580 W0x 486DX-25 4-8 MB 64 MB 8 32-bit x8 Long 32-bit SCSI w/c DA B-II
5580 W2x 486DX2-50 4-8 MB 64 MB 8 32-bit x8 Long 32-bit SCSI w/c DA B-II
8595 Jxx 486DX-50 16 MB 64 MB 8 32-bit x8 Long 32-bit SCSI w/c DA B-II
9585 5Nx 486DX2-66 8 MB 64 MB 8 32-bit x8 F/W SCSI-2 (planar) XGA-2
9585 5Kx 486DX-33 8 MB 256 MB 8 32-bit x8 F/W SCSI-2 (planar) XGA-2
9595 6Nx 486X2-66 16 MB 256 MB 8 32-bit x8 F/W SCSI-2 XGA-2
9595 5PT Pentium 60 16 MB 256 MB 8 32-bit x8 F/W SCSI-2 XGA-2
9595 5QT Pentium 60 16 MB 256 MB 8 32-bit x8 F/W SCSI-2 XGA-2
9595A 8NT 486DX2-66 16 MB 256 MB 8 32-bit x8 Passplay RAID XGA-2
9595A 8PT Pentium 60 16 MB 256 MB 8 32-bit x8 Passplay RAID XGA-2
9595A 8QT Pentium 66 16 MB 256 MB 8 32-bit x8 Passplay RAID XGA-2
All-in-one Models (similar to 8525 but MCA-based)
5530 S0x 386SX-16 4 MB 16-bit x3 ESDI Stage-I
5530 S1x 386SX-16 6 MB 16-bit x3 ESDI Stage-II
5530 Txx 386DX-20 6 MB 32-bit x3 ESDI
5530 U0x 386SX-20 3 16-bit x4 ESDI XGA
5530 UAx 386SLC-20 3 16-bit x4 ESDI XGA
5530 V0x 386SLC-20 3 16-bit x4 ESDI
5530 V28/VAB/
VX8/VXB		 486SLC2-40 4-8 MB 16 MB 3 16-bit x4 ESDI DA IV
XGA-2 for -VXx
5530 Wxx 486SX-20 4-8 MB 32 MB 4 32-bit x4 Short 16-bit SCSI
5530 W2x 486DX2-40 4-8 MB 32 MB 4 32-bit x4 Short 16-bit SCSI
5530 Lxx 486BL2-66 4 MB 32 MB 4 32-bit x4 EIDE DBCS DA /NI-J
5530 LXC 486BL2-66 4 MB 32 MB 4 32-bit x4 EIDE XGA-2

# - Number of SIMM sockets
Pink colored cells indicate models that are classified as PS/55Z.

For Model 5538 PS/55E, click HERE.

Laptops, Notebooks, Lunch Boxes

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

PS/2 and PS/55 Cross-reference

PS/2 PS/55 Notes
8570 5551-S/T/V 5551 is wider than 8570 for 1 added AVE MCA slot
8580 5571 Possibly the same, except for the BIOS ROM
8590/9590 5561 Modified chassis, different planar (6 MCA slots, SIMMs on planar, no XGA, one serial).
8595-xKx 5580-Yxx All 5580 use the 8595 1S1P planar
8595-xMx 8595-Jxx Both the same, except for the BIOS ROM. Type 3 50 MHz complex.
9585 9585 Both the same, except for the BIOS ROM
9595 Type 4 9595-xxx All PS/55 9595 use 2S2P planar and Type 4 complex.
Coding is almost the same.

PS/55 Codenames

Model Codename
Model 5521-Y"Verdy-JR"
Model 5530-U/V"Florence V-ENH"
Model 5530-V"Florence 1/2 (B2SX)"
Model 5530-W"Florence M3"
Model 5551-L/R"Virginia" or "Verdy"
Model 5560-W0"Corvus"
Model 5560-W1"Sofia 2.1"
Model 5560-WN8"Sofia 2.1+3mode"
Model 5580-W"Canberra 2.1"
Model 5580-Y"Albireo"

Source: EMT Reference Disk images

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 29 Sep 2024 - Changelog | About | Legal & Contact