The REX Moniter Control Area is a data area used by IMiREX to initialize the DMTAXS and DMTLAX modules, point to queues of system data (such as the link table chain and the
chain of tag elements), set up a series of synch locks forREX processing function, set up a console element, read and write channel programs, a console tatle buffer, a message buffer, a TAKE request table, and buffer, and various work constants.
Field!!,gme REXREX REXAXS REXLAX REXTVECT REXEND REXLOCKS ATTNLOCK REXCONSL DMTREXCN CONSADDR REXREAD REXWRITE REIIN REIMSG DMTREXID REIOtlT REITAKE
REIREQREIRESP DC OF'0',CL4'REX' DC OF'0',CL8'DMTAXS' DC OF'0',CL8'DMTLAI' DC OF'O' DC V (DMTSYSLKj DC V (DMTSYSRT) DC V (DMTSYSPT) DC V (DMTSYSTQ) DC V (DMTCOMVC) DC V (DMTSYSND) DC OF'O' DC I'00',AL3(REQLOCK) DC I'00',AL3(ATTNLOCK) DC I'40',AL3(REICONSL) DC I'80',AL3(PROGLOCK) DC OF'0',X'00',AL3(0) DC F'O' DC AL2(CONSADDR) DC ALl (1) DC ALl (TYP3210) DC A (0) DC 2F'O' DC X'OO' DC 31'00' EQU REXCONSL EQU X'009' CCW I'OA',REXIN ,SILI,L'REXIN CCi X'09',REIOUT+2,SILI,0 DC CL 130' , DC CL11'M OP' EQU REIMSGt-2 DC CL 130' , DC OF'O' DC CL4' , DC AL1(L'REXREQ),AL3(REIREQ) DC A (REIRESP) DC XL140'00' DC AL 1 (0) iask name AXSname LAXname LlnK. tat.le chain
Route table chainSwitchatle port chain iag slot queue Common routine vector
End ofREX initial load Main REX wait list
Request arrival synchrenous lock addressConsole attention synchronous lock address Console I/O synchronous lock address
Program check synchronous leck addressConsole attention lock Synchronous lock for I/O operation CUU console device address
Cnebyte requested on unit check Console device type code Channel program address to be filled in S10 condition code and ending csw return information Sense return information on
unit check
Reserved forIBM use
External name
Iefault console cuu
Reader operator responseiype a console message Console input buffer MSG command start iransfer user identification
Cutput l:uffer
Request TAKE table
Sending task name filled inby TAKE manager
Address and length of
request buffer
Address of responsebuffer iAKE request buffer
Neverany response messages
Appendix E.RSCS Control Areas 287
chain of tag elements), set up a series of synch locks for
Field
REIREQ
Route table chain
End of
Request arrival synchrenous lock address
Program check synchronous leck address
Cne
unit check
Reserved for
External name
Iefault console cuu
Reader operator response
Cutput l:uffer
Request TAKE table
Sending task name filled in
Address and length of
request buffer
Address of response
Never
Appendix E.