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Old 11-10-2007, 01:58 PM
TomL_12953 TomL_12953 is offline
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Location: Malone, NY USA
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Smile Re: Updated power supply and the RTC card

I have an RTC board and have it jumpered to use the 2 MHz crystal for a time base. Since I'm only going to use it to generate regular interrupts for MITS Time Share BASIC and not for an accurate clock, I don't care if it drifts a little as long as I keep getting interupts. One question I do have, though is that the manual for the RTC specifies that:

"If you are constructing the 88-RTC, a hardwire connection must be made between the Mother board and the power supply board. This connection brings the unrectified +16 volts to buss #55 for use as the line frequency input for the 88-RTC."

Is this nessa* even when the board will be using the 2 MHz crystal? If so, then I won't be able to use the 88-RTC without the mods listed in the thread. If it's not nessa*, then I'm all set. I can't wait to get my Altair replica!

* A humorous substitute for "necessary" from Mel Brooks' film, "High Anxiety"
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