----- Original Message ----- From: "Rob Clarke" <firstname.lastname@example.org> To: <email@example.com> Sent: Wednesday, February 15, 2012 6:34 PM > Q6) I think modern ATX supplies have now dropped the -12V rail. From > looking at the schematics this is only used for the RS232 port. As I'm not > likely to use this any time soon, will I have any issues if I omit > the -12V rail? -- AFAIK ATX supplies still supply -12V (blue wire, pin 14 of the 24-pin version, pin 12 of the 20-pin version). > Q7) The CBM-II PSU's all supply a 50/60hz signal from the PSU, which I > think is just used for the TOD clock on the CIA. As I'm unlikely to find > this on a modern PSU, is there a really simple way of generating this > signal? -- As mentioned previously, an opto-isolator across the PS's AC input in series with an appropriate resistor or capacitor to drop the voltage/limit the current as required and a pull-up resistor if needed. Message was sent through the cbm-hackers mailing listReceived on 2012-02-16 02:00:29
Archive generated by hypermail 2.2.0.