Loading The PDP-10 EmulatorMaxc Operations125. LOADING THE PDP-10 EMULATORAssuming system power has been turned on and the Alto is at command level (Alto Executive), onemay load the microcode and start Tenex by means of the single command:MIDAS TENGOMidas will run through the TENGO command file which loads the microcode, displays some junkon the screen, and starts up Tenex. This takes about a minute.After loading the microprocessor, TENGO resets the machine (21;G) and checks the microcode(25;G). The microprocessor may crash (IMA=20) if there were any failures detected duringloading. LM 10 will contain the address of the incorrect word (if only one word was clobbered).1Note the values of LM 10 and IMA in the log and call system maintainers if the microprocessorcrashes. If you cannot get the system maintainers, get out of Midas (by selecting "Exit" with themouse) and repeat MIDAS TENGO, since hardware flakiness has been known to cause loads to failspuriously and you may be lucky on the second try.If the load succeeds, AltIO is started, which in turn boots in Micro-Exec from one of the Maxcdisks. The following message is printed out on the Maxc console:Micro-Exec, Ver *Micro-Exec immediately executes an automatic "Go" command, which causes Tenex to be loadedfrom disk and started. Further procedures are described in the next section.If it is desired to load the microcode without starting AltIO or Micro-Exec, use the TENLOADcommand file instead of TENGO; i.e. type:MIDAS TENLOAD TENLOAD is identical to TENGO except that it does not start AltIO, Micro-Exec, or Tenex, butrather leaves control in Midas.To start AltIO and boot in Micro-Exec (without starting Tenex), select "AltIO", "Boot-MExec", and"Do-It" with the mouse.The MEXECGO command file combines the effect of TENLOAD followed by starting AltIO andbooting in Micro-Exec.Note: The above procedure only works when Micro-Exec is on save area 1 of disk unit A. This isnormally the case. However, during periods when disk controllers are being checked out or whenthere has been hardware flakiness with disk controllers, MEXEC may not be on unit A. In thiscase it is probably on another disk drive. You should follow the procedure discussed in "CallingAltIO" in order to boot Micro-Exec from another drive.------------------------------1Checker failure interpretation is discussed in more detail in section 11.ÿî)ïfªqôXî;òpôi î ·îuï](rôXî ·ïYüsô…ð_î ·ïXxôðFîâïUMî ·ïR"ô—ô˜ðAî ·ïPžô€ð?î ·ïMrôÀð.ôÁð,î ·ïKîôÞðIôßî ·ïJ#ô™ðGôšïJ°tî ·ïHŸsô§ð]î ·ïGô ô¡ðRî ·ïE—ô„ô…ð?î ·ïDô€ð2î ·ï@èô°ô±ðXî ·ï?dô€ðAîØï<8ð,îØï:´î ·ï7‰ô¤ð:ô¥î ·ï6ô€ðMî ·ï2ÚôµðPô¶ î ·ï1Uô€ð*îØï.*î ·ï*ÿôŸð)ô ð3î ·ï){ô€î ·ï&Oô†ô‡ðYî ·ï$Ëô€î ·ï! ô›ð!ôœð5î ·ï ô€î ·ïðusô‹ðBôŒî ·ïlô›ðZôœî ·ïèô«ðTô¬î ·ïdô˜ð6ô™ð,î ·ïàô€ð6î ·ïtî ·ïeïØôFðI ‚ ·µ>çTV÷ TIMESROMAN  TIMESROMAN  TIMESROMAN  TIMESROMAN  TIMESROMAN TIMESROMAN  ÿÿj/ —Ú’vÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿMaxcOps5.BravoRWeaverSeptember 24, 1981 6:59 PM