Re: ECB PropTerm

[Borut <bkor...@gmail.com>]

Hi!

PropIO can not be used with 6x0x board, neither with 6502 nor 6802 processor. 6809 has MRDY input to extend data-access time but the other two don't,
so connecting to prop must be done using a parallel peripheral device.
Another option (better imho) would be to modify the existing PropIO with addition of two connectors that would enable PropIO to be stacked  on 
6x0x IO mezzanine connecting Prop to VIAs using P10/P11 connectors and aligning the holes for spacers. 
In a similar way the ParPortProp is connected to Zeta. 

Borut


On Tuesday, February 12, 2013 4:49:12 PM UTC+1, yoda wrote:
> Why do we need another propIO which this is with a parallel port stuck in front of it?  PropIO works reliably under 6MHz and can be made reliable above that by just putting in a set/reset flipflop of the CS / enable connect to the wait.  I believe there are spare NAND gates on the board to do this but I have not had time to do that - seems it would be more productive to implement the solution on the current board and get a re spin then to make a whole new board.
>
> On Tuesday, February 12, 2013 2:37:16 AM UTC-6, Sergey wrote:
> > Hi,
> >
> > I uploaded the initial schematics for ECB PropTerm:
> > http://n8vem-sbc.pbworks.com/w/file/63550295/ECB%20PropTerm%20-%20Schematic%20-%200.1.pdf
> >
> > Basically it is a ParPortProp together with an 8255 PPI and ECB
> > interface attached.
> >
> > It provides simple and reliable terminal (and also SD card storage)
> > capabilities to ECB systems.
> >
> > Perhaps schematic can be simplified a bit (I think 74LS241 buffers on
> > EBC are redundant).
> >
> > I'd like to get any comments and suggestions...
> >
> > Thanks,
> > Sergey