Caple C871i Bedienungsanleitung PDF herunterladen (Seite 190)

Apple II Computer Info

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From: Rubywand <[email protected]>

Newsgroups: comp.sys.apple2

Subject: Re: Slots not working

Date: Fri, 20 Feb 1998 04:01:57 -0600

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Supertimer writes ...

> I had a ROM 1 GS motherboard which worked fine except the slots

> did not work. When a card was plugged in and the control panel was

> set to YOUR CARD, the slots were still seen by the GS as empty.

> ALL the slots had this problem EXCEPT the memory expansion slots.

> What was wrong with this motherboard?

If you are saying that, whatever the card and whatever the Slot, the

cards plugged into the GS's Slots did not work, then, there are a few

halfway decent suspects on a GS that, otherwise, seems to work okay:

1. A break in the trace which is supposed to supply +5V to each Slot

card would shut down nearly any Slot card.

2. Most Slot cards need to receive and/or send information over the

Slot Data bus. A defective 74HCT245 (IC UF2) or one with a loose/broken

pin connection would be likely to kill Slot Data bus transfers.

3. A defective Slotmaker chip (IC UE11) or one with a broken trace on

any of several inputs would render most Slot cards non-functional.

4. A break in any of several traces supplying signals to the Slots

would disable many Slot cards.

5. Many Slot cards would not work should any of several Slot traces be

Apple II Computer Technical Information : Apple II Family Hardware Info

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