jsgray@watdragon.UUCP (Jan Gray) (08/23/86)
I just bought a db25->centronics connector to hook up my ST to an old Seikosha GP-100A printer (I believe it was also marketed by Commodore under a different name...this is the printer with a one dot print head). Unfortunately, characters sent from the ST arrive ddoouubblleedd at the printer. This printer works correctly with other computers...is there something slightly out of spec about the ST printer port, or have I simply missed something? Thank you for any help, Jan Gray jsgray@watdragon University of Waterloo 519-885-1211 x3870
z-80@othervax.UUCP (Grant Bonnell) (08/28/86)
In article <1310@watdragon.UUCP> you write: >I just bought a db25->centronics connector to hook up my ST to an old >Seikosha GP-100A printer >Unfortunately, characters sent from the ST arrive ddoouubblleedd at the >printer. I have also experienced this problem and determined that it was due to a difference in potential between the ground at the connector of the atari and that of the printer. This causes noise on the signal lines and produces the effect you mention. A temporary solution is to ensure that one of the two cable ends is NOT connected to the chasis ground. This problem may stem from the fact that your equipment is not properly grounded. Are you certain that the outlets into which your equipment is plugged are grounded? For example in my house (built about 30 years ago) I discovered that even though the wall sockets were the grounded type (presumably installed by some previous owner) the ground screw was not connected to anything, since the house was wired with only two conductor cable. I hope this helps. Grant Bonnell !philabs!micomvax!othervax!z-80