🚀 go-pugleaf

Keith Bennett (kbennett@cpcug.org) wrote:
: I am trying to decide which SCSI card to use in a certain setup and
: would appreciate any advice you can offer.  Previously I have used
: the Adaptec 1522A, but MicroWarehouse informs me that it is now
: discontinued.
: 
: 3) Does it use PIO or DMA?  Is it a bus mastering card?  I remember
: reading a while back about the 1542, for example, only being able to
: access the first 16 MB of memory.  The result in OS/2 was that
: anything above 16 MB was used by the OS as fast swap space but was
: otherwise unavailable to the system.
: 

The card isn't bus mastering (the 1542 is). The 16 Mb memory limitation is
a limitation of the ISA bus, but I ran a 32-meg machine for a while that
way and was quite happy - there's nothing wrong with using the "extra"
memory as hyperfast swap space, since that's virtual memory, i.e.
more-or-less what the memory would do if it were directly addressable. 
 
Stuart