Questions tagged [apple-ii]

The Apple II series of personal computers and related software and hardware. Use [apple-iigs] for the Apple IIgs in particular, or [apple] for Apple hardware in general.

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How can I connect a PIA or VIA chip to the Apple IIc?

I have an early Apple IIc, model A2S4000 with the 342-0272 motherboard and ROM 255. (I am considering upgrading the ROM, perhaps with a switch that would let me switch between different ROM versions.) ...
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594 views

What's the first use of the term, "1977 Trinity"?

The term "1977 trinity" has been used, here on Retrocomputing SE and elsewhere, to refer to a set of three computers that started shipping in mid- to late-1977: the Apple II, the TRS-80 ...
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164 views

What would happen if the DHR jumper was enabled on a Rev A Apple //e?

The Apple //e originally did not support Double HiRes graphics (DHR). The engineers realized they could double their hires and lores X resolution shortly after the introduction of the machine, so the ...
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301 views

Cost of Apple II switching power supply

Apple went to the trouble of designing a switching power supply at a time when they were still quite new and not widely used for consumer electronics, perhaps because Steve Jobs liked the aesthetics ...
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107 views

Apple II DMA daisy chain also used to arbitrate /INH?

On the Apple II series of computers, peripheral cards contend for bus mastership through a priority daisy-chain system. A peripheral card is only allowed to perform DMA if its DMA_IN line is at logic ...
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Frozen horizontal width coil in old CRT monitor

I have an old Apple IIe CRT monitor which could use a small horizontal width adjustment. Unfortunately, as I try to rotate the hex key in the coil with a CRT adjustment tool, it doesn't want to move. ...