PX41CX extra characters on terminal connection

[krischik]

When DUMPin the calculator content I get all sorts of extra characters:

Code:


>Miniterm.command                                          
--- forcing DTR active
--- forcing RTS active
--- Miniterm on /dev/tty.usbserial-1430  115200,8,N,1 ---
--- Quit: Ctrl+E | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
KÛÛ[ÛkÛI[$ÿÿim{ÛoÛ¶oÛ}Ú[ÛkÛ[û␡ßm{ÛoÛ_ûÿÛÛKÛiÛ¶ßÛmm{ÛoÛ_ûmÛÛ{ÛoÛÿýÛÿû[ÿûÿßkÛIÛÛ-}Ûß[ÛkÛI¶ûÛÿÛ{ÛoÛùûkÒ{ÛKÛÛûÛ␡ûÿÛmÛÛÛÛÛÿÚKÛi[[ûiÿ{ÛoÛÛÛ␡ÛïÒÛ{ÛKmÿßý[ÛkÛI[û_û[ÛkÛÒÛ[ÿÛIÛÛ{»ÊÛKßkÛmÛû·Ûÿï{ÛkÛmÛK␡ßÛÛ{ÛoÛÛÛÿû÷ݵ¯5½¥­Õ½µÝ­µµµµµU½µÝ­¯­µ­µ×µµÍ­·­µ­µ×µµ​͵¯µµµµWµ­ý­µ­µ­­Õ­µUµ½µ­½µÕ­µUµ×µµµ½×­­}ÿÿïÿÿÝÿÿÿÿÿÿÿïõµU½µÍ­¯µµµµWµ­ý­­­µ½µÕ­µ​Uµ½µ­½µÕ­µUµ¿µµÕµWµ­õ­­µµ­µÕµµUµ­µ­½­Õ½µÍ­¯µµ­µWµ½õ­­µµý␡ÿÿ¿¿ýÿÿÿÿ␌
PX41
04 01620000000002 00000000000000 00000000000000 00000000000000 
08 4b039200000000 90fffffffff0ff 00000000083000 00000000000000 
0c 1000000000019c 1a70016919c19b 0000002d048000 00000000007000 
198 00000000000000 00000000000000 00000000000000 00000000c00020 
A: 09999999999000  B: 0000002d0480fd  C: 000000002d00fd
S: 00001010000000
M: 000018a5ff83d3  N: 000000000000c0  G: 00
EOF
␄ÿµõ½U½µÝ­­µµµ½Õ­µÍ­¯µµ­µWµ½õ­­­µ­µÕµµUµ­½½µ­Õ½µÝ­­µµµ½×­­uµ½µÕõµU­µÝµ­µµµ½Õ­­Ý­​¯­÷ëÿû¯ÿÿÿÿWõ­­­µ½µÕµµU½¯­­½µ×µ­Í­¯µµµµWµ­ý½­­µ­µÕ­µÝµ­µµ¥½Õ­µUµ¯½­½­×­­Ý½¯­µ­µ×​µµÍµ¯µµµµW½µÿ¿ÿÿïÿ¿ÿÿÿÿV5µ¥½Õ­µÝµ­µµµ½Õ­­Ý­¯­µ­µ×µ­Ý­¯µµ­µ×µµÍ­¯µµµµWµõõ­­µµ­µWµ​½Õ­­µµµµW½µý­­­µ­µÕ­µUµ½µ­½µÕ­µÝµ­µµµ½×­­uµ­½õ¥­Õ­µÝ­ÿ¿ÿûÿúµÛÿï[ÛkÛI␥m␡␡Û[kÛmÛÚ{{ÿÛ{Ûo␥i␡ûomÛÛ{Û·ÛûÿÛ{Ûo[ÚïÿÿÛ{Ûo[I␡{ÛÚ{Ûo[Ò_[ûJÛÛ[Û%ÛÛkÛm[ÛoûÞßÿþKÛi[Ûm␡ÖÛkÛmÛÛßûÿÛ)ÚkÛÛm␡–ÛkÛmÛÛkÿ␡Û)ÚkÛÛ[ÛûnkÛmÛÛiÿ␡ûÛIÛÛ{ÛÿòÒoÛI[Ûë

That doesn't look good. Is this this a problem with the calculator build, a floating data line, leakage currents or just normal?

I use macOS and get the problem with any terminal emulation. Parameters used for Miniterm where:

Code:


python3 ${Python_Packages}/serial/tools/miniterm.py \
    --echo                        \
    --encoding "Latin1"                    \
    --eol "LF"                        \
    --rts 1                        \
    --dtr 1                        \
    --rtscts                        \
    --exit-char    "5"                    \
    --menu-char    "20"                    \
    "${USB_Serial_Device}"                \
    "${USB_Serial_Speed}"

Full source code: Miniterm.command