HP Forums

This is from a few years ago, but since Arduino is probably trending topic maybe it is interesting to keep records of this procedure.

1) Connections

You can use an audio-cd cable for the connections. Just follow:
[Image: bmpkfzJvJixzo.bmp]

HP-48 GND to Arduino GND, RX to TX and TX to RX arduino pins respectively.

2) HP-48 serial server code scripts

START:

Code:

<< CLLCD 0 'N' STO CLOSEIO CLLCD "READY" 1 DISP OPENIO REV >>

REV:

Code:

<< CLLCD BUFLEN DROP SRECV DROP DUP "" == IF THEN DROP ELSE RREP OBJ-> END REV >>

RREV:

Code:

<< BUFLEN DROP SRECV DROP DUP "" == IF THEN DROP ELSE RREP 1 CLLCD DISP END REV >>

RREP:

Code:

<< "" -> S Q << S 1 S SIZE START DUP NUM 255 - NEG 2 / CHR Q SWAP + 'Q' STO TAIL NEXT DROP Q >> >>

Code:

<< BUFLEN DROP SRECV DROP >>

IOPAR (it's the default one):

Code:

{ 9600 0 0 0 3 3 }

3) Arduino sample code
Just send 0x00 and then any command you want to evaluate!

Code:

void setup()

{

  Serial.begin(9600);

  // Preparing the calculator

  Serial.print(0x00,BYTE);

  Serial.print("#131 #64 BLANK PICT STO { #0 #0 } PVIEW ");

  delay(100);

  Serial.print(0x00,BYTE);

  Serial.print("\"\\<<\" \"HELLO WORLD\" 34 CHR SWAP + 34 CHR + \"

MSGBOX \\>>\" + + OBJ\\-> 'helloworld' STO ");

  delay(100);

  Serial.print(0x00,BYTE);

  Serial.print("PICT { #2 #2 } \"Starting...\" 1 \\->GROB REPL

1000 0.2 BEEP 2000 0.1 BEEP 1 WAIT");

}

If you want responses from the arduino, you have to XMIT them to you back to the microprocessor, example:

Code:

Serial.print(0x00,BYTE);

Serial.print("1 1000 FINDPRIMESROUTINE XMIT");

And that's all!
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Working sample
Here is a bit more lengthy sample for the arduino:
http://servicios.ried.cl/arduino/hp48_la...ounter.pde

That counts boxes:

eried