[GreenKeys] Troubleshooting papertape reader.
Tom Watson
tsw-tty at johana.com
Thu Apr 23 18:11:11 EDT 2015
Your problem with reading the tape into a computer may be due to the input program wanting to echo a <CR><LF> pair when it sees the <CR> character. This can delay the input of the subsequent <LF> character and get lots of things out of sync.
Another problem may be that if you are reading in at 110 baud, you need to specify TWO stop bits. The input stream has them, but the echo stream only has them if there is sufficient delay between characters, and if a single character echos two characters, things can get out of hand quickly.
Once I had a Silent 700 with tape machines and attempted to input into a M6800 an S1/S9 tape. The problem was that I Had setup the echo for two stop bits, while the input stream only had one stop bit. It looked OK until the accumulated timing error surpassed the buffering of the M6850 ACIA chip and a character was dropped. If I ran things at 110 baud, it worked out OK since they sent the data with two stop bits (and it was echoed that way).
You just need to look at all the parameters and make sure everything matches, and you don't echo too much. It may be even better to NOT echo you never know.
Good luck.
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