dbrothers@DDN1.ARPA (04/03/85)
I have transferred files from an APPLE ][ to a KAYPRO using MEX on the KAYPRO and ZPRO on the APPLE ][ over a null modem at speeds of up to 9600 baud. It worked beautifully. I initially did it using modems at 300 baud and a phone, but found that the phone line is unnecessary if you have a seriel card in the APPLE ][, you can easily use a null modem cable. A null modem cable can easily be built. It is simply a pair of db-25 connectors (Males usually) that have the following pin connections: Pin 1 to pin 1, pin 2 to pin 3 at the other end, pin 3 to pin 2 at the other end, pin 7 to pin 7, pin 6 to pin 20 at the other end and pin 20 to pin 6 at the other end. The idea is to swap the send and receive lines and the dtr and cts lines. If you have an APPLE ][ super serial card, then you don't need to build anything. You can set the configuration block to the TERMINAL mode and use your existing db-25 cable. Read the book and you'll see that this configuration is the same as having a null modem cable. It should be possible to write the RWTS (read-write-track-sector) code that resides at BD00-BFFF in an APPLE ][ in 8080 code and make it run in a KAYPRO. The hard part would be to get the documentation which describes how you access the disk directly from 8080 code in the KAYPRO. You would need to know how to turn on the motor, how to check for write protect, how long to wait after turning on the motor before reading, what the data really looks like when you do a read (bit-by-bit read) and how you define which disk drive you want to access. I do not know if this information is available for the KAYPRO. It is also possible to use MEX, MODEM7, or any other xmodem-capable program to do quick APPLE ][ to KAYPRO transfers. I like using MEX because it has wild card capability. If the files you need to transfer are ascii, rather than binary, it is possible to use PIP on both ends to transfer them from the APPLE ][ to the KAYPRO. this is not the rpeferred method, however. There is no checksum or CRC if you use PIP. Best of luck... Doug