Re: [Simh] VAXELN, rtVAX-1000, WTC, time

2018-12-15 Thread Johnny Billquist
Not really. :-) This gives the technical explanation on how the system works. Bottom line is that you have a TOY clock, and it continues working even with power off. The battery is just the power source of the TOY when main power is off. What is needed to be understood is how the TODR

Re: [Simh] VAXELN, rtVAX-1000, WTC, time

2018-12-15 Thread Wilm Boerhout
The few actual reads of the TODR during ELN's execution are returning low values (since nothing actually set the clock yet). Do you get the same result if you don't attach the CLK device? If the result is the same, then it would seem that ELN doesn't care to use the hardware clock for much

Re: [Simh] VAXELN, rtVAX-1000, WTC, time

2018-12-15 Thread Wilm Boerhout
Mark Pizzolato schreef op 15-12-2018 om 21:42: On Saturday, December 15, 2018 at 12:09 PM, Wilm Boerhout wrote: [...] DBG(1041144)> CLK REG: todr_rd(ROM) - TODR=0xC3AA5B84 This line ^^^ and all above it are done by the MicroVAX 3900 boot ROM and have nothing to do with ELN. DBG(7056415)>

Re: [Simh] VAXELN, rtVAX-1000, WTC, time

2018-12-15 Thread Wilm Boerhout
Mark Pizzolato schreef op 15-12-2018 om 19:10: Hi Wilm, On Saturday, December 15, 2018 at 3:45 AM, Wilm Boerhout wrote: I'm trying to get my head around VAXELN and system time. Before I cry "Wolf" and accuse any innocent program(mer) of instruction obstruction, I want to know how things are

Re: [Simh] VAXELN, rtVAX-1000, WTC, time

2018-12-15 Thread Mark Pizzolato
Hi Wilm, On Saturday, December 15, 2018 at 3:45 AM, Wilm Boerhout wrote: > I'm trying to get my head around VAXELN and system time. > > Before I cry "Wolf" and accuse any innocent program(mer) of instruction > obstruction, I want to know how things are supposed to work here (i.e. > as on a real