manes@vger.nsu.edu ((Mark D. Manes), Norfolk State University) (03/07/91)
Greetings one and all.
I seek information.
First what appears to be my misconception.
I know that the Amiga 2000 is limited to 9mb of 16 bit memory. I know
that when a bridgeboard is added you can only have a maximum of 6mb's
of memory. I also _thought_ that if you wanted to have a bridgeboard
and you wanted to go above 6mb of memory you could add an accellerator
board and 32bit memory. I _thought_ that this 32bit memory would be
placed so that a bridgeboard would not interfer. I guess this is
not correct.
We (Video Computer Resources) attempted to put a 33mhz GVP 68030
board in a Amiga 2000 with a AT Bridgeboard. The customer purchased
the 8 megabyte version of the board. We can get everything to work
if we pull 4 megabytes of the 32bit memory. If we leave all 8
in, the Janus software fails with a 'unable to open library' error
message.
Is the memory configuration the problem, or are there other
possibilites.
Your thoughts are appreciated.
-mark=
+--------+ ==================================================
| \/ | Mark D. Manes "Mr. AmigaVision, The 32 bit guy"
| /\ \/ | manes@vger.nsu.edu
| / | (804) 683-2532 "Make up your own mind! - AMIGA"
+--------+ ==================================================
rbabel@babylon.rmt.sub.org (Ralph Babel) (03/07/91)
In article <709.27d4f185@vger.nsu.edu>, manes@vger.nsu.edu ((Mark D. Manes), Norfolk State University) writes: > I know that the Amiga 2000 is limited to 9mb of 16 bit > memory. Not quite. It's ~8.5 megs of _Zorro-II_autoconfig_memory_. The memory width doesn't matter, though normal Zorro-II boards are 16 bits wide, of course. But even 32-bit-wide memory in the coprocessor slot can be made to behave like normal Zorro-II autoconfig RAM, so it can in fact eat up your autoconfig space. > I know that when a bridgeboard is added you can only have > a maximum of 6mb's of memory. ... provided your RAM expansion board permits that configuration. Most boards don't, since 6 MB is really 4 MB plus 2 MB (i.e. it must behave like two autoconfig devices). GVP's Series-II SCSI+RAM for the A2000 does support 6 MB. > I also _thought_ that if you wanted to have a bridgeboard > and you wanted to go above 6mb of memory you could add an > accellerator board and 32bit memory. I _thought_ that > this 32bit memory would be placed so that a bridgeboard > would not interfer. I guess this is not correct. This depends on the design of the 32-bit RAM expansion. If it is Zorro-II memory (added by expansion.library), then the usual limits apply. All of GVP's original accelerator boards behave that way. The new A3050 in conjunction with the new RAM32 expansion daughterboard, however, allows 4 MB of Zorro-II RAM _plus_ a maximum of 16 MB (located at $01xxxxxx). This "Extended RAM" is configured automatically by a ROM on GVP's board. > Your thoughts are appreciated. Hope this helps, Ralph
daveh@cbmvax.commodore.com (Dave Haynie) (03/09/91)
In article <709.27d4f185@vger.nsu.edu> manes@vger.nsu.edu ((Mark D. Manes), Norfolk State University) writes: >Greetings one and all. >I seek information. >I know that the Amiga 2000 is limited to 9mb of 16 bit memory. The important thing to realize is that the memory range allocated for Zorro II boards is 8.5 megabytes long. >I also _thought_ that if you wanted to have a bridgeboard >and you wanted to go above 6mb of memory you could add an accellerator >board and 32bit memory. I _thought_ that this 32bit memory would be >placed so that a bridgeboard would not interfer. I guess this is >not correct. That depends on the accelerator. Some accelerators, like the A2630 and probably the GVP, use Zorro II autoconfiguration protocols to add their memory to the system, even though they are not real Zorro II devices. This allows hard disks to access that memory, and makes it behave pretty much like any supported add-in memory, only faster. It is also possible for a 32 bit board to support memory that's not in the Zorro II memory range, but that usually makes it nonstandard, and always means that it can't be reached by hard disk DMA. It is really up to the designer of the 32 bit coprocessor board to chose which makes the most sense for their intents. >We (Video Computer Resources) attempted to put a 33mhz GVP 68030 >board in a Amiga 2000 with a AT Bridgeboard. The customer purchased >the 8 megabyte version of the board. We can get everything to work >if we pull 4 megabytes of the 32bit memory. If we leave all 8 >in, the Janus software fails with a 'unable to open library' error >message. That memory is in fact using the Zorro II autoconfig space. It may not help, but GVP is currently advertising that their 50MHz 68030 board can support either 8 or 20-something megabytes on its daughterboard. I suppose they would map some as Zorro II memory, some as either A3000 motherboard or Zorro III memory (assuming they wanted to appear somewhat standard). > | \/ | Mark D. Manes "Mr. AmigaVision, The 32 bit guy" -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "What works for me might work for you" -Jimmy Buffett