Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!ucla-cs!casey From: casey@CS.UCLA.EDU Newsgroups: comp.bugs.2bsd Subject: Problems with Spectralogic "Spectra 25-Plus" disk/tape controller Keywords: 2.10BSD, autoconfig, TS tape emulator, Spectralogic "Spectra 25-Plus" Message-ID: <16291@shemp.CS.UCLA.EDU> Date: 29 Sep 88 00:21:16 GMT Sender: news@CS.UCLA.EDU Reply-To: casey@CS.UCLA.EDU (Casey Leedom) Organization: UCLA Lines: 53 Mike King (mike@cvs.rochester.edu) of Rochester is having problems getting autoconfig to recognize the TS portion of his Spectralogic "Spectra 25-Plus". tsauto.c is returning ACP_NXDEV which is causing autoconfig to refuse to attach the TS emulator. tsauto tries to read memory location ((struct tmdevice *)addr)->tmba to determine whether there's a TS around. Returning ACP_EXISTS (success) if trying to grab the word generates an error, and ACP_NXDEV (failure) if it doesn't generate an error. The problem is that the TS and the TM share the same CSR address (0172520), but the *standard* TS CSR is only two words long: /* * TS11 controller registers */ struct tsdevice { u_short tsdb; /* data buffer */ u_short tssr; /* status register */ }; and the TM CSR is seven words long: /* * TM11 controller registers */ struct tmdevice { u_short tmer; /* error register, per drive */ u_short tmcs; /* control-status register */ short tmbc; /* byte/frame count */ caddr_t tmba; /* address */ short tmdb; /* data buffer */ short tmrd; /* read lines */ short tmmr; /* maintenance register */ }; As one can see, tmba is beyond the last legal address in a TS CSR, so testing for its existence should a perfectly reasonable way to determine what kind of tape controller we really have. But, apparently the Spectralogic has status registers up there. Can someone tell me where the Spectralogic's status registers end? This is especially important because we now have an integrated primary tape boot strap that has a TS, TM, and HT driver in it and it uses this same technique to determine what kind of tape controller is really out there (though it uses tmmr instead of tmba). If you have any information on this, please send it as soon as you can. Thanks for your help! Casey