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.
8
questions with no upvoted or accepted answers
9
votes
1answer
566 views
How do I clean/refurbish an Apple IIc Keyboard?
My Apple IIc is what appears to be the first US model: A2S4000 with
version 255 ROMs. The keyboard PCB is marked 820 0108 03 ©1983, and
the keyswitches are the "cross" type as seen below, without any
...
4
votes
0answers
164 views
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.)
...
4
votes
0answers
159 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 ...
4
votes
0answers
294 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 ...
3
votes
0answers
380 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 ...
2
votes
0answers
99 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 ...
2
votes
1answer
224 views
Was the ProDOS beep part of the kernel or just a commonly duplicated piece of code?
On the Apple II, system beeps were typically just the 'Control-G' beep noise. However, many ProDOS-based applications from Apple Computer abandoned the firmware-based beep routine and instead used a ...
1
vote
0answers
105 views
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. ...
