khbsnsr@nmt.edu (Kenneth Brunell) (10/17/90)
I am having some problems with uploading stuff from my 48 to my computer. I have had no trouble whatsoever downloading to the 48. But, if I try to upload a directory it goes to 2 or maybe 4 blocks and croaks, like it can't get a good checksum. I can upload single items, in ascii mode. Trying those same files in binary mode, it dies on either the 4th block or the 15th block, depending on which file, and apparently at the same place in the same file. ARCHIVE stops on the 2nd block. (as the others, 10 retrys, then fails) I am using OS9 Kermit on a Tandy CocoIII. Could there be a problem in my Kermit? Oh, also, the "cable" is rather makeshift, and unshielded, but, again, id downloads OK. Any help GREATLY appreciated. I sure would like to be able to back memory. -Ken ------------------------------------------------------------------------------- | _ , __ _ _ | "It's green . . ." | | ' ) / / ) // // | Mr. Scott | | /-< _ ____ /--< __ . . ____ _ // // | | | / ) </_/ / <_ /___/_/ (_(_/_/ / <_</_</_</_ | Loooove that .sig | | <khbsnsr@jupiter.nmt.edu> | | ===============================================================================
rrd@hpfcso.HP.COM (Ray Depew) (10/20/90)
It sounds to me like the problem is your unshielded cable. When you're downloading to the 48, your Coco is putting somewhere between 5 and 12 volts on the line, so your signal-to-noise ratio is pretty good. Going the other way, though, your 48 is only putting out about 4.2 volts, so the S/N ratio is somewhat worse. Considering the possible sources for EMI/ RFI in the vicinity (monitor, power supplies, flourescent lights, disk drive?), I'm not surprised that you're having trouble. A lot of people ignore the shielding and get away with it, but you're just one of the lucky ones who needs it. Try wrapping your homebrew cable in aluminum foil, or even window screen. Connect it to both the Coco and the 48. I know it seems like a pain in the wazoo, expecially since you've already made the cable. but it should do the trick for you. Good luck. Ray Depew IC's by Bill and Dave rrd@hpfitst1.hp.com
khbsnsr@nmt.edu (Kenneth Brunell) (10/23/90)
OK, thanks to everyone's helpful hints. I finally found my problem. You must either have both your computer and HP48 in binary mode, or the HP48 in translate mode 3. Boy do I feel stupid. The calculator rejected the crc returned by the computer because the computer would make an ascii character out of the special caracters it would recieve, and this would be wrong. -Ken ------------------------------------------------------------------------------- | _ , __ _ _ | "It's green . . ." | | ' ) / / ) // // | Mr. Scott | | /-< _ ____ /--< __ . . ____ _ // // | | | / ) </_/ / <_ /___/_/ (_(_/_/ / <_</_</_</_ | Loooove that .sig | | <khbsnsr@jupiter.nmt.edu> | | ===============================================================================