Re: Ultrawarp...

[Michael J. Mahon <mjmahon@aol.com>]

STYNX <stynx@gmx.de> wrote:
> No Problems with the HS-SCSI. The HS-SCSI had DMA disabled (of course)
> since no slotbased Apple II(e/+/c...) Accelerator allows DMA on other
> cards in the same system (the exception is of course the IIgs). It might
> have worked to a degree on the 4mhz ZIPChip though (unconfirmed).

Nope. 

No card incapable of snooping DMA bus transactions and no CPU socket
accelerator can function correctly with DMA. The fundamental issue is that
it cannot keep its memory or cache consistent with the Apple II memory. 

For Zip Chip and RocketChip, a critical issue is that they do not implement
the /RDY line of the CPU. (This also keeps them from working with most
floating-point coprocessors.)

> I cannot get to the setup of the RamFast with the Ultrawarp enabled (even
> at 1Mhz). I deactivated the DMA without the Ultrawarp installed but no
> luck so far since the DMA-Setting seems to be reset if i reboot with the UW installed. 
> ----
> 1 step: boot with RF only
> 2 step: disable DMA in RF menu (in#5)
> 3 step: shutdown+install UW
> 4 step: boot with UW at 16.667mhz and slot #5 set to 1mhz speed
> 5 step: try to boot #5 (in#5) -> lockup with shit on screen
> 6 step: coldreboot and "poke 49245,0" to set UW to 1Mhz
> 7 step: try to boot #5 (in#5) -> lockup with shit on screen
> 8 step:  coldreboot and "poke 49243,0" to disable UW
> 9 step: normal operation with RF -> RF has set "DMA: enabled" by itself!
> ----
> I have found no method to disable DMA by hardware (Rev.D RamFast) like a
> jumper or dip-switch before booting, since there is only the termination-power jumper.
> ----
> The RF remembers its settings if the UW is not installed, even after
> several cold-reboots and longer periods of not being powered on.
> ----
> The RF works flawlessly with an Accelerator II and a Transwarp.
> 
> -Jonas

-- 
-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon