XMODEM.200 A Christensen Checksum Protocol Program for the TANDY 200 XMODEM.312 Written by: Rick Perry 75665,1045 TANDY 200 Conversion by: Jim Irwin 72346,1020 REF: XMODEM.DOC; XMODEM.UPD; XMODEM.312 XMODEM.312 has been converted for the TANDY 200. XMODEM.DOC and XMODEM.UPD describe the operation of the program. The TANDY 200 version works the same as the Model 100 version. The following describes the changes made to Rick's program: 1. All STAT references had "NN" added to them. The first "N" refers to the TANDY 200 control code filter. The second refers to adding line feeds. "NN" makes the 200 perform just like the Model 100. 2. The ROM references were converted to their corresponding addresses in the TANDY 200. The changes were: Model 100 TANDY 200 Description --------- --------- ----------------- 4073 4116 Get Upper Case 6118 6429 Start RS232/Modem 12777 16189 XTHL PCHL 16969 20328 Cursor On 17061 20420 Set/Disp Fn Keys 17875 21499 Blank Prev Screen 21172 25010 Keep Phn Off Hook 21179 25018 Hang Up Phone 21264 25102 2 Second Delay 21270 25108 Delay(A-1)1/2 sec 21274 25112 1/2 Sec Delay 21276 25114 Delay A*2 msec 21293 25131 Dial Phone 21392 25250 Auto-Logon 21608 25483 Term Mode 21795 25757 Disp Prev Screen 27804 33762 Restore Fnct Keys 28013 34056 Check Queue 28030 34073 Get Char from Q 28399 34364 Carrier Detect 63056 61234 Prev Scrn Enable -86: -738: 65450 64798 Char in Kybd Bfr 3. DATA statements 94 and 95 were modified to reflect the revised ROM calls. I wasn't a user of Rick's program for the Model 100, so I'm not very familiar with its features and capabilities. I think I found all things in the program that needed modification for the 200. I have Logged On, Uploaded, and Downloaded using the TANDY 200 version, so that part apparently works fine. If anyone has trouble with the operation of this program, please send me a message describing what you were trying to do, and the problem(s) encountered. The conversion was easy. Enjoy Rick's fine programming effort on your TANDY 200!!! Jim Irwin 72346,1020