I have had one request for the clocking information on the Miata systems. I've had one person send me the clocking on his PWS 600au, the 433a settings were in a maintainance manual on digital's site, and I read the switch settings off my own board. I have attached the results of my own efforts. Those interested can keep reading. If the people at alphalinux.org or any other site want to post it (put it in the Miata section), fine with me, just keep it intact. Let me know if this helps anyone. If it matters, I believe my board is old-style, as it does not have an on-board SCSI port as newer ones seem to. Jeff DeMaagd File starts here: ---------------------- Jeff DeMaagd (c) 1999, Open Content Licence Miata Clocking Data ------------------------------------- Miata - Alpha Personal Workstation series My system is a Digital PWS 500a (Miata) I have tested: 433, 466, 500, 533, 566, 600 MHz. These work for me: 433, 500, 533, 566. I have tried 466 twice with no results, the system won't start. The CPU gets too hot at 600 and the system stalls on SCSI BIOS initialization Note: This information applies to the Miata series systems ONLY. Testing for Miata: ------------------ If you are using Linux, type 'cat /proc/cpuinfo', and check that the system type is 'Miata'. The cycle frequency value allows you to double check the set clock frequency. In Windows NT 4, run the 'System' applet in Control Panel. The initial panel should have 'Miata' in it somewhere. Clocking information --------------------- There exists a bank of slider switches (like DIP switches) below the CPU. You'll need to slide the mainboard out to check or change the settings. Don't go any further if you do not feel confortable or are unqualified to perform this. Of course, the system should be totally powered down, and self grounded. '1' is a switch with the tab in the 'up' or 'on' position '0' is a switch with the tab in the 'down' or 'off' position If flipping the switches, use care as the switches can be delicate. Please read carefully and double check everything. Read entire document before trying anything. Known Calculated Calculated Status Values Values Values Left to Right Left to Right to Left Right CLK MMMM MMM MMM MMMM MMMM MMM RATE 6543 210N N012 3456 6543 210 266 -> -> 1001 0000 -> 0000 1001 - not tested 300 -> -> 1001 0010 -> 0100 1001 - not tested 333 -> -> 1001 0100 -> 0010 1001 - not tested 366 -> -> 1001 0110 -> 0110 1001 - not tested 400 -> -> 1001 1000 -> 0001 1001 - not tested 433 -> 0101 1001 -> 1001 1010 -> 0101 1001 - PWS 433a 466 -> -> 1001 1100 -> 0011 1001 - didn't work 500 -> 0111 1001 -> 1001 1110 -> 0111 1001 - PWS 500a - orig system 533 -> -> 1010 0000 -> 0000 0101 - PWS 533a :) 566 -> -> 1010 0010 -> 0100 0101 - PWS 566a ;) 600 -> -> 1010 0100 -> 0010 0101 - stalled on boot 633 -> -> 1010 0110 -> 0110 0101 - not tested 667 -> -> 1010 1000 -> 0001 0101 - not tested 700 -> -> 1010 1010 -> 0101 0101 - not tested 733 -> -> 1010 1100 -> 0011 0101 - not tested 766 -> -> 1010 1110 -> 0111 0101 - not tested - Kryotech? :) 800 -> -> 1011 0000 -> 0000 1101 - get a life. Or an XP1000. N -> Unknown meaning, assume that it is always 'on' Mx -> Clock multiplier digits. The lower the number, the higher the digit's significance. M0 and M6 seem to be always Most of this information is conjecture. Test or use at your own risk, if at all. You can easily fry your system's CPU. Replacement CPUs cost around 400US$ for a 533MHz unit. As Alphas run a bit hot in the first place, please be careful! The AlphaBIOS startup DOES change to reflect the new clock rate. I like it when the system says I have a 566a computer, but the system really doesn't feel much faster (566/500 = 1.13 factor, or 13% faster at best), so other than bragging rights, this may not be worth doing. ----------------------------------------------------------- Pete Wickoff emailed me this: (reformatted to match above) Right Left to to Left Right CLK MMM MMMM MMMM MMM N012 3456 6543 210N 600 -> 0101 1011 -> 0101 1011 -> PWS 600au ----------------------------------------------------------- Pete's switch settings suspiciosly look like an inversion of my calculated value. I am not sure if I am misreading the email he sent me. I suspect that the inversion signifies the 'u' (UN!X) designation to the system, but I don't need it and won't risk my system any more to find out. This data is provided for informational use only. No one providing, transmitting or caching this information is to be held responsible for any damage from use or misuse of this information. This includes: Me (Jeff DeMaagd), Pete Wyckoff, those in Compaq, or the former Digital Equipment Corporation, Samsung, or Red Hat.