WP-34s from HP-30B: FTDI Board alternative FLASHing Instructions

[iceman]

See Attached photo. The FTDI BOARD can be obtained as eBay item

301380778878,
191362294962 or,
111514068357

Or just search eBay for "FTDI" then sort on "Price + Shipping: lowest first"

You may wish to perform a self test on the HP-30B PRIOR to FLASHING as there is no self test in WP-34s code.

================ HP-30B Self Test =========================

Press and hold: PMT
Press and release: ON
Release: PMT

Display "Tst Screen"
Press INPUT
Perform the screen test by pressing any key 12 times.
It should return to Display "Tst Screen"

Press the DOWN arrow then "INPUT" (or "ENTER" if you already re-labelled the key.)
Display "Tst Keyboard"
Press INPUT
Perform the keyboard test by pressing every key at least one time
Note the key number of each key on the display. (Not necessarily sequential, or contiguous.)
Press [ON/CE] key to exit test when prompt is "Tst Screen" or "Tst Keyboard"

===========HP-30B FLASHing Instructions=======================

1) FTDI-BOARD. IMPORTANT: Set jumper to 3.3V
2) LEFT [OPEN(DTR), RX, TX, +3V, OPEN(CTS), GND] RIGHT
3) Connect calculator as follows:

[RESET Button]
-----O

RX TX +3V
O---O---O

O---O---O
E GND RESET
R
A
S
E

FTDI TX -> 1KOHM -> CALCULATOR RX
FTDI RX <- 1KOHM <- CALCULATOR TX
FTDI +3V -> CALCULATOR +3V
FTDI GND -> CALCULATOR GND

4)Apply power (Tx and Rx do not need to be connected for this part)
5)Short and hold +3V and ERASE
6)Press the "ON" Key
7)Release short on +3V and ERASE
8)Short RESET and GND or press a Paper Clip in the RESET hole
9)Press the "ON" Key (no response, it is now brain-dead and waiting to be FLASHed)
10)Connect Tx and Rx (as well as +3V and GND)
11)Download Firmware using MySamba
12)Press RESET or remove Power
13)Apply Power and press "ON"
14) h 1 . ENTER (Crystal Test)
15) h 3 x ^ Enter (Stopwatch Test)