ERSHC@CUNYVM (01/03/91)
I have just added a 2d hard drive to my XT clone. I have one floppy,
and seagate 225 and 251 hard drives. Is my 150 W power supply
enough? I also have an old 68.5 W power supply laying around.
Does it make any sense to use it as an 'external' PS for just tone
of the hard disks? Oh, there are 3 other internal cards (modem,
multi I/O, printer/video driver) and of course a controler card
for each drive.
Thanks for the advice!
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eric schweitzer In theory, there is no difference
ershc@cunyvm.cuny.edu between theory and practice,
@cunyvm.bitnet But in practice there is.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++gsm@gsm001.uucp (Geoffrey S. Mendelson) (01/04/91)
eric schweitzer asked: >I have just added a 2d hard drive ...... >Is my 150 W power supply >enough? IBM (and clone) power supplies are designed to shut down completely if: 1. There is no load (which would cause it to overvoltage and burn out). 2. There is too heavy a load or a direct short and it would burn out. 3. The power supply cannot maintain +5 volts accurately. My advice, from experience, is if it works, use it. but don't expect it to work when you add another device. I've had a system run fine on a 65 watt supply until I added another 3 1/2" floppy. Then it stopped working. It just shut down, with no damage to it. If you have a real 8088 in your machine switching to either an 80c88 or a NEC V20 will give you about 1 amp @ 5 volts (5 watts) of power back, about a 10% increase in speed and the 8080 instruction set if you want to run any old cpm stuff. (Last I checked you can get a 10MHZ V20 for about $10.) As for using the old power supply as an external one, it would work, albeit clumsy and unsightly. On the other hand, I recently bought an XT 200 watt power supply for $60 at a local clone store. If you are good at marketing you probably could get close to $60 for both of the old supplies and pay very little out of pocket for a new one. -- Geoffrey S. Mendelson (215) 242-8712 uunet!gsm001!gsm