Assessments - 1, GPA: 4
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Facilidade de uso
To replace the old EPROM with the new EPROM, follow the procedure below: 1. Unplug the A/S-4 and remove the cover by removing the 4 cover screws on the side and lifting the cover upwards. 2. Find the old EPROM on the electronic board. It is the only chip with a label affixed to it. 3. Note the little notch at the end of the EPROM is toward the front of the box. The new EPROMs, when inserted, must also have the notch toward the front of the box. 4. Remove the EPROM by taking a flat head screwdriver a pocket knife, or another flat edged instrument and inserting the flat edge between the ERPOM and the socket holding the EPROM at the two ends where there are no metal legs. Pry one end up just a little and then pry the other end up just a little. Continue prying both ends up just a little in a rocking back and forth motion until the EPROM becomes free of the socket. 5. Insert the new EPROM by aligning one row of metal legs first with one side of the socket. Make sure this row is firmly in the socket but not pushed down in the socket. Now align the other row of legs in the socket pushing the legs firmly in place but not down in the socket. Now if all legs are aligned, push the EPROM into the socket slowly watching to see if any legs bend. If any leg starts to bend or does bend, remove the EPROM as in Step 4 above and straighten the leg as much as possible by hand or with pliers, if available. Try inserting the EPROM again. If a leg continues to bend or breaks off, do not throw the EPROM away, return it to the factory. 6. With cover still off, turn the box on and check for the power up attribute message on the terminal device. If the power up message is displayed continue to step 8. 7. If not, check for any bent legs or any leg that did not go into the socket. Also make sure the EPROM notch is toward the front of the box. Correct any EPROM problems found. If the EPROMs cannot be made to work (display the attribute message), return the A/S-4 and EPROMs to the address on the title page for repair. Please call for a Return Authorization Number. 8. Replace the cover of the A/S-4 and insert and tighten the 4 cover screws. 65 PROTOCOL CONVERTER MODEL A/S-4 12. System/Line Gen for Batch The following is a VTAM/NCP/JES2 line gen for a 3776 model 3 or 4. For more information on specific parameters, refer to the appropriate IBM manuals. IBM 3770 SNA Installation Guide - GC30-3064 Component Description for the IBM 3776 and 3777 Communication Terminals - GA27-3145 VTAM Generation Manuals - MANY NCP Generation Manuals - MANY NCP & VTAM Parameters: Most values are defaults ——————- HOST MACRO —————— UNITSZ = 384 VTAM’S data buffer size ————— (LINE (GROUP) MACRO ———— DIAL = NO No for leased line or yes for dial-up A/S-4 operation LNCTL = SDLC For SDLC line TYPE = NCP For NCP (3) CLOCKING = EXT or INT Modem or A/S-4 supplies clocks (2) DISCNT = NO or YES If switched SDLC line should drop if no active LU sessions DUPLEX = FULL or HALF Full or half duplex line INTRPI = 2 (*) NEWSYNC = NO No new sync on modem (3) NRZI = YES or NO NRZI coding can be used PAUSE = 2 Time between xmitting operation (poll) 200 ms POLLED = YES Polled Line REPLYTO = 1 Time between retries of operation (polls) if not answered 1 second, maybe 2 or 3 RETRIES = (1,2,5) Retry 1, wait 2 seconds, do it 5 times SERVLIM = 4 Number of regular Scans of NCP order table before a special scan (PU not responding to SNRM) SPEED = 4800 Line Speed (300 to 19.2K baud) 66 CHAPTER 12: System/Line Gen for Batch TRANSFER = 7 MODETAB = INSTINCLM Name of table used by VTAM for line bind parameters SSCPFM = USSSCS 3770 RJE log-on is a character-coded log-on VPACING = 2 —————- PU MACRO —————ADDR = C1 Line hardware hex address value IRETRY = YES Retry poll operation on idle PU, maybe no MAXDATA = 265 or 521 Maximum amount of (PIU) data NCP will xmit to the terminal MAXOUT = 7 if MAXDATA = 265 Maximum number of data blocks (PIUs) 4 if MAXDATA = 521 that NCP can xmit to PU before requesting an SDLC data link acknowledgement MODETAB = RJEMODE Name of table used by VTAM for PU bind parameters PASSLIM = 7 if MAXDATA = 265 Maximum number of PIUs that NCP can 4 if MAXDATA = 521 xmit at one time PUTYPE = 2 Physical Unit type 2 RETRIES = (1,3,5) Retry 1, wait 3 seconds, do it 5 times SSCPFM = USSSCS 3770 RJE logon is a character-coded logon DLOGMOD = BUF256 if MAXDATA = 265 Logmode entry used BUF512 if MAXDATA = 521 ANS = STOP Stop on automatic network shutdown, maybe CONTINUE —————- LU MACRO ————— BATCH = YES Informs NCP that this is a BATCH LU BUFFLIM = 2 The product determines how many PPBUF elements VTAM will receive from a LU until VTAM can transfer the data to the application LOCADDR = 1 to 1 Local address of this LU on the PU A/S-4 supports only one LU (1) PACING = 3 NCP to send 3 request units (RUs) before waiting for pacing response 67 PROTOCOL CONVERTER MODEL A/S-4 USSTAB = RJEINCDT Table used by VTAM to interpret user logons VPACING = 6 VTAM sends 6 RUs to NCP before response ISTATU...