QB 5.0.4 buffer
4 messages in this thread
I'm using Quarterback 5.0.4 on my A2000+2630+8MB+GVPSCSIctrl with a
Wangtek 5150 tape drive.
I can't seem to set the buffer size to anything above 256K. The program
seems to check only amount of chip-ram available even if I specify it
should use Any memory.
Even stranger, if I specify Any ram the program uses Fast-ram instead of
the chip-memory even though it has checked whether enough chip-ram is
available.
Does anyone know of a solution to this ???
Ged Murphy on Autopilot ……Bonn,Germany
Quarterback allocates its buffers from the 24bit DMA-able memory pool.
On most machines with accelerators this ends up being chip ram. Also
three times the figure that you set for the buffer size is required
as we need three buffers that size. Quarterback will use any
available memory to build its internal catalog that it uses to
control the backup. On many disks this can be larger than the
buffers.
"Quarterback allocates its buffers from the 24bit DMA-able memory pool. On
most machines with accelerators this ends up being chip ram."
My question is why? Any technical reason that you can't set up
Quarterback to use 32-bit memory as it's memory pool if its
available? Quite a few of us have accelerator's or 4000's and running
out of memory with a 16MB computer with a 512K buffer allocated seems
a little screwy.
John,
Nearly all SCSI adaptors for the Amiga can only DMA to 24-bit memory
(they were originally designed for the A-2000, which doesn't have
32-bit memory). Therefore, for compatibility's sake we made the
"Any" memory option mean 24-bit memory. Unfortunately this means
that if none of your expansion memory (i.e. "fast" memory) is in the
24-bit address space then it will allocate memory from the graphics
(i.e. "chip") pool. Also, Quarterback 5.0 came out before the
A-4000, so this wasn't a very big problem back then.
The next version of Quarterback will have an option for "Any", "24-bit", or
"Graphics" memory buffer allocation, where the "Any" option will allocate from
memory above the 24-bit address space. However, it will be up to the user to
make sure that their SCSI adaptor can DMA into this memory before they use this
option.
James Bayless
Central Coast Software
A division of New Horizons Software, Inc.