12 Dec
2005
12 Dec
'05
10:52 p.m.
On Sunday 11 December 2005 12:24, you wrote:
On 12/11/2005 at 4:54 PM Jules Richardson wrote:
If your goal is to be a controller in a single controller system,you can do
IEEE-488 with only i/o ports and proper drivers (75160/75161/75162)
If you are trying to make a target device you need hardware help. The
required time to get off the bus when ATN is asserted is far too short
to do in software. Just a couple of gates will do. All you need do is
detect the assertion of ATN ,disable the drivers and force not ready
for data. The CPU can take its time setting outputs to the correct state
before re enabling the drivers NRFD will hold off the controller.
I know a lot of systems that implement IEEE-488 controller with nothing
more than PIAs and drivers.
joe lang
Eelco Huininga wrote:
> Does anyone have any documentation or software (other than IEEEFS 0.5
> and NIEEE 0.2) for Acorn's IEEE488 interface for the beeb?
On a slight tangent--is there really anything else required for
medium-speed HPIB support other than a bidirectional 8-bit port with a few
handshaking lines? It seems to me that th Victor 9000 advertised IEEE-488
capability with little more than a "dumb" parallel port.
Cheers,
Chuck