z3rambd —
Zorro III RAM block device driver
z3rambd* at zbus0
altmem* at z3rambd?
The z3rambd driver provides support using Zorro III RAM
  boards as block devices (e.g. for swap).
The z3rambd driver supports the following hardware:
  - AmigaKit ZorRAM
-  
- DKB 3128
-  
- FastLane Z3
-  
- Individual Computers BigRamPlus
-  
 
The z3rambd device first appeared in
  NetBSD 7.0.
The z3rambd driver was written by
  Radoslaw Kujawa
  ⟨radoslaw.kujawa@gmail.com⟩.
Currently it is up to the user to ensure that given memory board is not used by
  the kernel as normal RAM. It is usually safe to pass the
  -n0 and -p parameters to boot
  loader.
If the kernel is compiled without the
    z3rambd driver, it is possible to use Zorro III
    memory boards as normal RAM in some configurations. However, this might have
    severe performance consequences. It is advised to use Zorro III memory
    boards as swap where possible.