joels@tektools.UUCP (12/18/84)
() Some things I have learned about 1541 channels by experiment: Channels 0 and 1 default to PRG type files. Channels 2-14 default to SEQ type files. All channels 0-14 can be used to access either type file. Channels 0 & 1 can be forced to sequential by appending ",S,R" or ",S,W" to the file name. Channels 2-14 can be forced to PRG type files by appending ",P' to the file name. Channels 2-14 will reference sequiential if either ",S" or ",R" or ",W" or ",S,R" or ",S,W" are appended. The shorter forms are not allowed on channels 0-1. "U" may be substituted for "S" above to get USR files. The manual states that up to 5 channels may be open at one time, but 2 of these are always reserved for channels 0 and 1. So up to 3 of channels 2-14 may be open at a time. Channel 15 is independent of this limit and may only be used for commands and errors. Closing channel 15 also closes all other open channels. Joel Swank Software Center Tools Support 50-487 Tektronix Beaverton OR 97077 (503) 627-4403
dwl10@amdahl.UUCP (Dave Lowrey) (12/20/84)
> The manual states that up to 5 channels may be open at one time, but > 2 of these are always reserved for channels 0 and 1. So up to 3 of > channels 2-14 may be open at a time. Channel 15 is independent of this > limit and may only be used for commands and errors. Closing channel 15 > also closes all other open channels. > Also....... Only one Relative file may be oprn at a time and it will take up the equivalent of two channels. -- ----------------------------------------------------------------------- Dave Lowrey "GORT...Klatu borada niktow" ...{amd,hplabs,ihnp4,nsc}!amdahl!dwl10 [ The opinions expressed <may> be those of the author and not necessarily those of his most eminent employer. ]