Iomega PC4B/50

@5FCB.ADF Iomega PC4B/HD SCSI Host Adapter Board
@7FF9.ADF IOMEGA PC4 Host Adapter Board
@7FFA.ADF Iomega PC4B/50 SCSI Host Adapter Board

os2v234.exe Iomega Tools for OS/2
FTP Iomega Software FTP

ADF for PC4B/50


J1 50 pin header
J2 DB37 Male
J6 Termination?
P1A MCA Edgecard
RP1-3 Resistor paks
RP4 Resistor network
U2 Sony CXK5864BM-12L
U6 NCR 86C01
U7 NCR 01148000
U16 16.000000 MHz osc

PC4B Interface Controller 
   The PC4 interface controller is for MCA (Micro Channel) computers. The PC4B controller will support the following Iomega drive subsystems: 
Bernoulli 230: 
MultiDisk 150: 
Bernoulli 90: 
Bernoulli 44: 
Bernoulli 20: 
Floptical 21: 
LaserSafe PRO: 

   The PC4 interface controller is an Iomega proprietary controller, not a SCSI controller. The PC4B will not support third party SCSI devices. The PC4B interface kit includes the 37 to 50 pin SCSI cable, OAD for DOS drivers, and Utility Users Manual. The PC4B controller may also be use with the OS/2, Unix, and Xenix operating systems. Addition drivers will be needed for any operating system other than DOS. 
   The PC4B controller will not have any configurable jumpers or switches for installation. All features of this controller are configured with the IBM Option Diskette that comes with the IBM computer. IBM models 90 and 95 must have a hard drive installed before the PC4B controller will function. 

   If your computer has a fixed disk drive, the fixed disk drive should be used to boot your computer. The ROM on the Iomega PC2B or PC4B adapter should be disabled.

AdapterId 7FFA Iomega PC4B/50 SCSI Host Adapter Board

I/O Address Select
   I/O address used by PC4B/50
      <"240" (io 00240h-0025Fh)>, 340 (0340-035F), 400 (0400-041F), 420 (0420-043F), 3240 (3240-325F), 8240 (8240-825F), A240 (A240-A25F), Disabled

DMA Level Select
   The PC4 supports the direct memory access (DMA) mode of data
transfer.  Most operating systems require this option to be
enabled.  Each DMA level has a corresponding priority level;
the lower the DMA level, the higher the corresponding priority.
      <"DMA Level 5">, 6, 7, DMA Disabled

   If 'Fairness' is enabled, the PC4 adapter will not compete for the channel during the next arbitration phase if it is currently in control of the channel.  This allows other installed adapters to obtain the channel in the next sequence based on each adapter's assigned priority level.  When 'Fairness' is disabled, the adapter will compete for every arbitration phase and will obtain more than its fair share of channel usage. 
      <"Fairness Enabled">, Fairness Disabled

IRQ level
   Operation with multi-tasking operating systems may require the use of an IRQ signal when the PC4 requires processor service. No other adapter may be assigned the same IRQ level as the PC4. For DOS-only systems, this option may be disabled. 
      <"IRQ 7">, 5, 3, 9, IRQ Disabled

Memory Address Select
   You may set the PC4 adapter to any one of the Memory Addresses
listed.  The first choice is recommended for systems with a fixed
disk installed. 
      < "Disabled">, D400 (d400-d5ff), D200 (d200-d3ff), D000 (d000-d1ff), CE00 (ce00-cfff), CC00 (cc00-cdff), CA00 (ca00-cbff), C800 (c800-c9ff)

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

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 18 May 2022 - Changes & Credits | Legal Info & Contact