Across the Boards
Communications Device Drivers
Section 5 - General Configuration and Usage Information
Page 178
cfSOFTWARE Confidential,
2000
5.1 Protocol Converter 3101 and VT100 (continued)
IBM AS/400 - VT100 protocol conversion
The AS/400 places asterisks in column 80 from row 9 down to simulate terminal lights or some such thing. This
disrupts data transfer.
NOTE
: To turn off this asterisking, send ESC ^W (hex 1B 17) from the PC to the AS/400
before
doing any data transfer or APPX CONNECT COMTEX.
-has only an 8 byte input buffer
-is easily overrun
-loses data when overrun (CFXPROX auto-resend AID sometimes corrects)
-later releases of this converter solve some of the above
Hydra
Channel attached (sends data to screen out of sequence).
NOTE
: May have trouble with 9600 bps UPLOAD (losing data or Enter key). If so, run at 4800 bps
or use a 2 millisecond KEYDELAY via MAINCON.
NOTE
: Has trouble with ASCII 7D hex ‘}’ and 7B hex ‘{‘ Hydra fails to translate properly to
EBCDIC:
ASCII 7Dh
should
translate to EBCDIC x’D0’ (zone-decimal -0).
ASCII 7Bh
should
translate to EBCDIC x’C0’ (zone-decimal +0).
The Fix:
The Hydra should already be set for device type IBM 3101 or VT100. Use the Ctrl_Y menu on Hydra
to fix the XATE table.
-PF1 (Esc a) cycle through commands till “DSPLY”
-tab to 2nd field
-PF1 cycle through commands to “XATE” ASCII to EBCDIC
-press ENTER (CR) to show table
-change at offset +7D from 7D to D0 at offset +7B from 7B to C0
-PF2 (Esc b) to “LOAD”
-press ENTER -- should load OK
-PF1 in first field till “RESET”
-tab to second field
-PF1 in second field till “ALL”
-press ENTER to reset all
NOTE
: The RESET ALL will cause all connected lines to DISCONNECT.
Sample Hydra control menu for fixing XATE table. Note change table at offset +7D from 7D to D0 and at offset
+7B from 7B to C0: Hydra-II DSPLY XATE DFLT 4.51B, V=5.
The (SNA or non-SNA) Hydra may be set to place an asterisk at row 1 column 80 as a LOCK-X substitute.
When the LOCK-X turns off, the asterisk is replaced with a space instead of the character originally overlaid by
the asterisk. Naturally, this causes data transfer errors. This problem seems to be dependent on whether the
Hydra is attached via BTAM or VTAM. It functioned correctly under BTAM and failed when the system was
converted to VTAM. In comparing the traces, under BTAM the asterisk was replaced before the second send of
the confirmation character was done.
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