Re: Mastering the RAMsandwich

Started by query_again March 9, 2006
Hi,

Currently, I am trying to connect a 3X4 keypad and parallel LCD to 
BX-24, however there is insufficient I/O, namely:
3X4 keypad => 7 I/O
parallel => 6 I/O

Hence, would appreciate if someone could kindly advise the usage of 
BXRM RAMsandwich to reduce the I/O requirement as well as direct 
interfacing with LCD and keypad

Thanks for any kind input.

--- In basicx@basi..., "G. Kramer Herzog" <hwanghetw@...> 
wrote:
>
> I don't have a web page, so this is the only place that you will 
see 
> and information.
> 
> The RAMsandwich is a bit more than RAM.  It is an LCD interface, 
has 
> 4 buttons[]
	
Well, my comments were quite some time ago.

The Ramsandwich is a board with 64K ram that connects to the BX-35, 
NOT the BX-24 and requires a development board in order to do so.  
The BX-35 is similar, but a somewhat more obscure cousin.  It has 
different limitations.

I suspect that you don't really want to go that far afield to get 
your BX-24 working.  I am not even sure that the BX-35, the 
development board, and the Ramsandwich are still available.

You might look into an SPI or One-wire adapter for an LCD interface. 
Another alternative is NetMedia's Serial LCD which is meant to 
resolve such problems.  A third alternative is to output to a shift 
register via two wires, then send it to the LCD in parallel via a 
third wire.

You may be able to 
--- In basicx@basi..., "query_again" <query_again@...> wrote:
>
> Hi,
> 
> Currently, I am trying to connect a 3X4 keypad and parallel LCD to 
> BX-24, however there is insufficient I/O, namely:
> 3X4 keypad => 7 I/O
> parallel => 6 I/O
> 
> Hence, would appreciate if someone could kindly advise the usage of 
> BXRM RAMsandwich to reduce the I/O requirement as well as direct 
> interfacing with LCD and keypad

> > 
> > The RAMsandwich is a bit more than RAM.  It is an LCD interface, 
> has 
> > 4 buttons[]
>
	
You can connect a 2x4 kepad with only 1 I/O. See my earlier email a 
about 2 months ago.
neil

query_again wrote:

> Hi,
>
> Currently, I am trying to connect a 3X4 keypad and parallel LCD to
> BX-24, however there is insufficient I/O, namely:
> 3X4 keypad ==> 7 I/O
> parallel ==> 6 I/O
>
> Hence, would appreciate if someone could kindly advise the usage of
> BXRM RAMsandwich to reduce the I/O requirement as well as direct
> interfacing with LCD and keypad
>
> Thanks for any kind input.
>
> --- In basicx@basi..., "G. Kramer Herzog" <hwanghetw@...>
> wrote:
> >
> > I don't have a web page, so this is the only place that you will
> see
> > and information.
> >
> > The RAMsandwich is a bit more than RAM.  It is an LCD interface,
> has
> > 4 buttons[]
>
>
>
>
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>
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> >.
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>

Umm, I made an error.  The Ramsandwich is used with the BX-01, not the 
BX-35.

And you can still buy both along with the development board and the 
RAMsandwich.
	--- In basicx@basi..., "G. Kramer Herzog" <hwanghetw@...>
wrote:
>
> Well, my comments were quite some time ago.
> 
> The Ramsandwich is a board with 64K ram that connects to the BX-35, 
> NOT the BX-24 and requires a development board in order to do so.  
> The BX-35 is similar, but a somewhat more obscure cousin.  It has 
> different limitations.
>