HP Forum Archive 21

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HP 30b serial port pinout Message #1 Posted by xset on 30 Aug 2012, 12:20 a.m. Hello I tried to repurpose my HP 30b but was able only to ERASE firmware. Failed all attempts to connect via Sam-BA. Looks like there no clear picture of HP 30b serial port pinout. I found in some message: J35 - GND J33- TxD J31 - Vcc J36 - ERASE J34 - RxD J32 - RESET but according HP 20b schematics: J35 - (calculator output) J33 - (calculator input) J31 - Vcc J36 - ERASE J34 - GND J32 - RESET Who knows the truth ? Thanks in advance!

Finally Success Message #2 Posted by xset on 30 Aug 2012, 12:27 p.m., in response to message #1 by xset I managed to flash HP 30b to WP 34s ! I have Seeeduiono Mega, which i set to 3v mode. It has FTDI chip on board. All you need to get flashing tool - to connect right pins (Tx0 Rx0 GND 3V3). As far HP 30b pinout - it seems to be same as HP 20b. J35 - Calculator In (Rx0 on Arduino) J33 - Calculator Out (Tx0 on Arduino) J31 - Vcc (3v out) J36 - ERASE (when asked, connect to 3v3 output on Arduino) J34 - GND (Connect to GDN on Arduino) J32 - RESET (just use button above) Check if Arduino (Seeeduino) talks on 3v levels on Rx0 Tx0 !!! I found BH 6-pin connector and plugged 3 wires to pins (J35 J33 J34) Previosly I erased firmware according WP 34s flashing guide. Then I started MySamba and pressed 6-pin connector to contacts and finally it WORKED ! I got my WP 34s. Now i am thinking about stickers and how to open the case to solder quartz in.

Finally Success Message #3 Posted by xset on 30 Aug 2012, 12:29 p.m., in response to message #1 by xset I managed to flash HP 30b to WP 34s ! I have Seeeduiono Mega, which i set to 3v mode. It has FTDI chip on board. All you need to get flashing tool - to connect right pins (Tx0 Rx0 GND 3V3). As far HP 30b pinout - it seems to be same as HP 20b. Uploaded with [URL=http://imageshack.us]ImageShack.us[/URL] J35 - Calculator In (Rx0 on Arduino) J33 - Calculator Out (Tx0 on Arduino) J31 - Vcc (3v out) J36 - ERASE (when asked, connect to 3v3 output on Arduino) J34 - GND (Connect to GDN on Arduino) J32 - RESET (just use button above) Check if Arduino (Seeeduino) talks on 3v levels on Rx0 Tx0 !!! I found BH 6-pin connector and plugged 3 wires to pins (J35 J33 J34) Previosly I erased firmware according WP 34s flashing guide. Then I started MySamba and pressed 6-pin connector to contacts and finally it WORKED ! I got my WP 34s. Now i am thinking about stickers and how to open the case to solder quartz in.

Re: Finally Success Message #4 Posted by Walter B on 31 Aug 2012, 12:41 a.m., in response to message #3 by xset Congratulations! BTW, please see pp. 142 and 181 of the manual. Edit: Added the pinout to the manual, build 3247. The two pages mentioned moved to 144 and 183. Edited: 31 Aug 2012, 5:23 a.m.

Re: Finally Success Message #5 Posted by xset on 1 Sept 2012, 9:05 a.m., in response to message #4 by Walter B Cool! Though I still could not find whole pinout for 6-pin connector there. Anyway I am going to solder caps and quartz, i see documentation will help me a lot.Thank you!

Re: Finally Success Message #6 Posted by Walter B on 1 Sept 2012, 2:24 p.m., in response to message #5 by xset Look to the table of contents, then go to p. 185. What are you missing?

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