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Picture of a 
	Model 55SX

 "Lionel"  
 Model 55SX 


Winner of Multiple "My Linux Box Sucks Harder Than Yours" Competitions.

Featuring original monitor, mouse, and keyboard.   Not as elegantly engineered as my Model 50Zs, but still a decent little low-end PS/2 machine.

Machine type: 8555-081
Announce Date: May 1991
Purchase price: $6559.00 (Australian)
Warranty Period: 1 (stinking) year
Australian flag 
	(patriotism is the...)
Manufactured: June 1991, Wangaratta, VIC, Australia
Microprocessor: Intel 80386SX
Clock speed: 16MHz, 0 wait state
Coprocessor: i80387
Instruction Set: 32 bit
Addressing: 24-bit
I/O Channel Width: 16/8-bit
Type of BUS: 16-bit MCA (Micro Channel)
Interrupt levels: 16
Type (MCA): Level-sensitive, shareable
Max. Burst Transfer Mode: 20 MB/sec
Bus Data/Address Parity Checking: Yes
DMA Channels: 15
DMA Burst Mode Supported: Yes
Bus Masters Supported: 15
Total number of expansion slots: 3              (Only 1 has direct video access)
Ports: PS/2 keyboard, PS/2 mouse, serial, parallel, VGA
System Unit: F80C
On system board: 4MB (2x 2MB)
RAM: DRAM (PS/2 72-pin SIMM, 2 sockets) 85ns parity checked
ROM: 128kb
ROM shadowing: Yes
Standard Graphics: VGA
Video Controller: 8-bit
Video Bus Master: No
Video Memory: 256K (DRAM)
RS232C Serial Ports: 1
UART Chip used: NS16550A
Speed (bits/sec): 19,200               (limited by software)
FIFO Mode Enabled: Yes
Supports DMA Data Transfer: No
Max. Ports supported: 8
Pointing Device Ports: 1
Parallel Printer Ports: 1
Bi-directional: Yes
Supports DMA Data Transfer: No
Maximum Ports Supported: 8 (6i)
CMOS Clock: Yes
Power supply: 90W, 110-220VAC
Weight: 8.65 Kg
Dimensions: H102 x W406 x D397mm
Drive bays: 2 3.5" ½ height
Floppy Disk Size: 3.5" ½ height
Capacity: 1.44MB
Media Sensing: No
Hard disk Size: 3.5" ½height
Capacity: 80MB *2
Type: ESDI
P/N: 79F4013
MLC: C81555
FRU: 56F8892
Model: WD-380S (IBM)
Average Access time (ms): 17 *1
Sector Buffer Size: 32K *1
Encoding Method: RLL
Data Transfer Rate/Second: 1.35MB *1
(ho hum...)
Revolutions Per Minute: 3600
Number of Heads: 4
Number of Platters: 2 *1
Sectors Per Track: 39
Cylinders: 1021 *1
Shock (Gs): Operating: 10 *1
Shock (Gs): Non-operating: 50 *1
MTBF (Hours): 110,000 *1
Interleave Factor: 1:1
Controller Connector Type: ESDI (DBA)
Autopark: No
*1 Note: this information was taken from The IBM PS/2 Assistant, and may not be correct for this HD model.  *2 I measure the HD as 78MB
  • If anyone knows anything else about this hard drive please let me know.
  • N.B. Will also support the 60MB drive from my 50Z

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