2.2 The IBM 7171 ASCII Device Attachment Control Unit - Index of

2. Storea. InputTo issue a store command, enter:('S') + (' ') + (addr) + (': ') + ! (' , + bytebyte) + (CR)This takes the bytes represented by the 'bytebytes' and stores themsequentially in NV -RAM starting at the given addr.b. Output(CRLF) + ('Ok') + (CRLF)c. Notes:1) No input line may exceed 80 characters, including the command andthe data.2) The ZAP program will echo back the entered characters for the storecommand. It is the User Program's responsibility to do a byte by bytecompare on the echoed data, and the entered data. If they do notcompare, an invalid ASCII character should be entered in the string,the User Program should wait for the Error response, and then retransmitthe line.3) The interface program is only invoked after a (CR) (ASCII X' OD ' ) isreceived. Thus, the entire store command is buffered. Placing aninvalid character in the store string will force an error. The entirestore string is checked for validity before being executed. Thereforeinputting an illegal character in the string will cause an error, and nodata will be stored.3. Compressed Storea. InputTo issue a compressed store command, enter:( , S ') + (' ') + (addr) + (':') + ! (bytebyte)This takes the bytes represented by the 'bytebytes' and stores' themsequentially in NV-RAM starting at the given addr. There is no space precedingeach 'bytebytes' inputted.b. Output(CRLF) + ('Ok') + (CRLF)c. Notes:See notes for Store.Appendix D. Interface for User Supplied Table Modification Program D-3