Re: ZVG

On Wed, 30 Apr 2003 13:13:38 -0700, "Bret Pehrson" <bret@infowest.com> wrote:

>Zonn -- have you looked at WRITE_PORT_BUFFER_UCHAR?

What I need is the ability to DMA a chunk of memory to the ZVG using the ECP
port in ECP mode.

All of the drivers I've looked at allow me to twiddle the bits of a parallel
port, but none of them allows me to set a pointer to a chunk of memory and call
a routine that will start a DMA transfer.

I push the ECP port pretty close to it's limits, getting the vector information
to it. The "bit twiddle drivers" must change to the privileged mode of the
processor each time a bit is twiddle, not only is this slow, but requires me to
hang around looping on the parallel part, when I need to be running emulation
and filling up the next buffer of vectors.

The need for DMA is to allow it to deal with the ECP when it needs dealing with,
without the foreground having to loop on a bit.

If anyone knows of a driver that does this I'd be interested, if anyone is
interested in writing such a driver, write me and we'll work something out!

-Zonn

>
>> -----Original Message-----
>> From: owner-vectorlist@synthcom.com
>> [mailto:owner-vectorlist@synthcom.com] On Behalf Of Hood, Eric
>> Sent: Wednesday, April 30, 2003 5:34 AM
>> To: vectorlist@synthcom.com
>> Subject: RE: VECTOR: ZVG
>>
>>
>> I got this message from Zonn...
>>
>> "... because of driver problems ZVGEmu does not run under W2k
>> windows, it must be Win'98 or DOS."
>>
>> "Here's the problem. I need to be able to talk directly to
>> the parallel port. W2K considers the parallel port off
>> limits to non-priveledged programmers. What is needed is a
>> W2k driver of some type that allow the ZVG access to the
>> parallel port. There are a few drivers out there that allow
>> accessing the parallel port, but the way the general use ones
>> work is by changing privileged modes each time they are
>> called, this is too slow for the ZVG. I need to be able to
>> dump a small buffer to the parallel port using the ECP mode."
>>
>> --Eric
>>
>> -----Original Message-----
>> From: Joel Rosenzweig [mailto:joel.rosenzweig@verizon.net]
>> Sent: Tuesday, April 29, 2003 10:11 PM
>> To: vectorlist@synthcom.com
>> Subject: VECTOR: ZVG
>>
>>
>> Does anyone have any software that will drive the ZVG under
>> Windows XP? I
>> thought I had this great plan to build a PIII machine with XP
>> and have the
>> machine connected to the internet for some future networked
>> vector multigame
>> action... I've been unable to communicate with the ZVG on
>> this new machine,
>> even after installing an additional PCI ECP parallel port device.
>>
>> On my previous machine, I was at least able to communicate
>> with the ZVG
>> using a command prompt from Windows 98. That was good - but
>> now that I've
>> migrated to XP and this new machine, I'm out of luck. The ZVG
>> apps fail to
>> see the parallel port. I'm hoping that there's some
>> software that will
>> save the day so that I don't have to write this driver!
>>
>> Joel-
>>
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Received on Wed Apr 30 17:02:23 2003