Hi,

Does anyone have programming examples of using the Einstein
user ports in mode 1 (eight bit import) in their Einey Docs.

From the Z80 PIO tech doc (can be found at
http://mysite.wanadoo-members.co.uk/eineydocs/erdhsm.html)

"Selecting Mode 1 puts the port into the input Mode. To
start handshake operation, the CPU merely performs an input
read operation from the port. This activates the Ready line
to the peripheral to signify that data should be loaded Into
the empty input register. The peripheral device then strobes
data into the port input register using the strode line.
Again, the rising edge of the strobe causes an interrupt
request (it has been enabled) and deactivates the Ready
signal. Data may be strobed into the input register
regardless of the state of the Ready signal if care is taken
to prevent a data overrun condition."

I've linked a printer cable between a PC and Einey's printer
port 8 data lines and swopped over the strobe and ACK lines.
Strobe goes from PC to Einey's printer port's ACK pin 19 as
listed in the Einstein Introduction manual. I know if I had
used the user port Z80 PIO's B port Strobe from the PC would
have gone to STB pin 10 of the user port as listed in
Einstein Introduction manual and RDY to PC's ACK. But Ive
used the printer port and set that as mode 1 which is wired
to PIO.

Data streams across from the PC ok but there is no hand
shaking as specified by the tech doc. Get a lot of duplicate
bytes.

It could be that the Z80 PIO's hand shaking facility for
mode 0 and 1 have not been made available for the Einstein.
Or more probable I've missed something in the set up
programming. If is this is the case the tech doc has not
been helpful.

In my Einey Mag back numbers lots of info on using mode
3-control mode. Nothing on mode 2. For mode 0-only mentions
to set mode 0 by an OUT to the control of &0F. For mode
1-only mentions to set mode 1 by an OUT to the control of
&47. There isn't any programming examples for mode 0 or 1.

Any help appreciated.

Regards Chris Coxall