GPIB Guru wrote:
> I am not aware of any way to convert an old GPIB-PCII to a more modern
> GPIB-PCII/IIA. The GPIB-PCII boards used a NEC7210 while the
> GPIB-PCII/IIA boards use a NAT4882. These are different chips with
> different pinouts and footprints. I don't see having the ability to
> create a PCII/IIA with what you have. The old boards with the NEC7210
> are not supported by any drivers since the DOS days since that chip is
> not compliant with the IEEE 488.2 requirements for the GPIB
> controller. If you really need a cheap GPIB-PCII/IIA, I suggest that
> you search on EBAY. Since you are looking for a Windows 98 system, you
> should be able to buy a GPIB-PCII/IIA, AT-GPIB/TNT (make sure it has
> the TNT and is no
t just an old AT-GPIB), or even a PCI-GPIB. ALL of
> these should link to the same DLL and be compatible.
The cb7210.2-pdip claims to be NEC7210 pin-compatible, IEEE 488.2
compatible and is a 40-pin dip. Why wouldn't that drop right into a
GPIB-PC board and look like a GPIB-PCII?? Address bus is the same,
dma is the same, irq is the same. Shouldn't that address the chip just
fine? GPIB-PC cards are free. PCII/PCIIA cards are EXPENSIVE (unless
you get lucky). Can't believe nobody's tried this.
It's a moot point now. Found a $15 PCII/PCIIA card. The upgrade chip
is probably more than that even if it works.
I've discovered that it's trivial to build a RS-232 to GPIB converter
around a PIC processor for textual I/O. After I implement a few of the
NI low level calls in a Visual Basic Class Module, it should drop right
in in place of the NI DLL...and the 30+MB of stuff that gets loaded
along with it. And I won't be tethered to a single machine.
mike
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