David Cook's latest activity
-
A couple of curiosities I picked up -- APS SCSI Power Plug II. I assume these allow you to 'hot swap' or 'hot power' SCSI devices... -
-
David Cook replied to the thread Macintosh II SI capacitor question.Those are ceramic capacitors, which are non-polar. That's why there aren't any +/- markings. However, the capacitors there are supposed...
-
David Cook replied to the thread Mac IIci "It is now safe to switch off your Macintosh".Wonderful! Congratulations.
-
David Cook replied to the thread Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide.Typo regarding pin 6 on the table, IMHO. When the computer first powers up, all the chips will be held in reset (frozen state) by the...
-
-
David Cook replied to the thread Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide.Actually, that looks good. The computer is in reset when when pin 5 of each of those chips is low (0V). The computer runs when pin 5 of...
-
David Cook replied to the thread Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide.You should still check S1 (to make sure it isn't shorted). However, given the resistors (100/(100+27))*5V = 3.94V, the voltage when...
-
David Cook replied to the thread Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide.With power off, check the continuity of S1 when pressed and not pressed. This switch often fails due to capacitor juice. I've replaced...
-
David Cook replied to the thread Mac IIci "It is now safe to switch off your Macintosh".After you get the message, if you push the rear button, does it power off? If it does, then there's only a couple of possible issues...
-
-
David Cook replied to the thread Looking for the document "Macintosh Worldwide Development: Guide to System Software".Here is what I’ve learned. Unless noted otherwise, all of this information is based on System 6.0.0 and Inside Macintosh Operating...
-
David Cook replied to the thread Looking for the document "Macintosh Worldwide Development: Guide to System Software".Bummer. Why didn't they just use a 64-bit integer at that point. It is slightly understandable when the 128K Mac came out. But, by the...
-
David Cook replied to the thread Mac IIci "It is now safe to switch off your Macintosh".Yes, you're doing the right things. Here is what the traces look like underneath the chips. Turn off power and check that each trace...
-
