Apple II

READY, PLAYER?

Submitted by 6502enhanced on December 7, 2017 - 5:52am

IMAGE(https://s33.postimg.org/jckkt5snj/READY.png)

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Apple II

hi, does anyone know MPF III(acer apple II clone) rom's problem

Submitted by adoreapple on December 6, 2017 - 8:47pm

hello everyone, I don't post article in this forum for many years. recently, I want to repair my collect acer MPFIII(apple II clone) but I need everyone assist, my engineer said, can I find U29,U30,U44 pal code?? fortunately, I found this ftp and download rom code data

https://mirrors.apple2.org.za/ftp.apple.asimov.net/emulators/rom_images/

my engineer get confuse, he said this ROM code it has MPF III and MPF II version, can it use both?? it seems lack U29,U30,U44 code, does anyone know how to get it or download

thank for everyone

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Apple II

Apple IIgs RGB Monitor

Submitted by Nevada on December 5, 2017 - 10:56pm

The monitor i have for my GS seems fuzzy and not crisp. I have only been able to get into the setup menu so far. is this normal or should it be crisp?

thanks!

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Apple II

Noob questions.

Submitted by Nevada on December 3, 2017 - 9:51pm

I picked up an Apple IIgs for fun (had one as a kid). I have the GS, monitor and a 3.5" floppy drive. Installed is a 256k memory card. nothing else. I have downloaded the 6.01 operating system for it. Anyways i have a few questions. I did some research but to be honest I am not sure I am searching for the right topics. Or I am and not finding it.

My questions are:

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Apple II

CPU

Submitted by wishtoknow on December 3, 2017 - 7:18pm

I read this today

In fact, the Apple II did two memory accesses per cycle, two million per second at 1MHz, with the video accessing the memory during
the first half of Φ2, and the processor during the second half, interleaving, so both could access the same memory at the same time
at full speed, with no conflicts.

Any idea from what Apple II book this is from?

Here is the webpage

http://wilsonminesco.com/6502primer/addr_decoding.html

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Apple II

Apple IIe PAL 820-0073-B does not boot

Submitted by Ciprix73 on December 3, 2017 - 10:40am

Hi All,
somebody can help me?
No BEEP, no DRIVE running; only garbage on screen (see pic)
Cleaned pins of ROM, CPU but nothing.
Any idea?

Step2
Replaced all 3764 with 4264...some time at switch on I hear the beep but always garbage. Reset combination works but the drive runs for few seconds without success.

Step3
Tried to replace the 6502 with 65c02 removed from working iic. Nothing

Step4
Tried to replace the rom with iic rom. Only vertical strips on monitor.

My doubt is a sort of "white oxidation" found on the IC of existing rom (see pic).
I've found this on ebay,

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F201822216278

someone can suggest me if purchasing?
Could be the problem?

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Apple II

Metal clip on IIe logic board. Any ideas?

Submitted by RuneRider on November 29, 2017 - 12:35pm

I bought this machine recently and found something odd. Have any of you seen this before?

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Apple II

If you get stuck

Submitted by wishtoknow on November 28, 2017 - 7:26pm

There is a website that will help you if you
get stuck in your text/graphics adventure.

It is not just limited to the Apple II series
but includes a wide section of platforms.

Registration of the site is required to
access the solution/s.

Here is the link:-

www.solutionarchive.com

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Apple II

How is the Apple II Plus keyboard encoder supposed to work?

Submitted by sharkey1331 on November 23, 2017 - 11:05am

(Darn, I just typed out a huge message, and when I submitted- it disappeared!)

I've recently acquired an Apple II Plus- and when I turn it on, the power light lights, the speaker beeps, and I see Apple II on the screen and a blinking cursor. However, the keyboard doesn't provide any input- except for CTRL-RESET works. No other keys work.

I've googled a bit- reseated any related chip I could find, verified continuity between keyboard encoder board pins and keyboard, keyboard ribbon cable, etc. No avail.

Can anyone point me to documentation of how the encoder is supposed to work? For example, a closed key switch- how is this "read" by the encoder, and what is sent through the ribbon cable to the motherboard?

Jason

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Apple II

Interfacing the Apple

Submitted by wishtoknow on November 22, 2017 - 8:37pm

I found this article on line written by Steve Jobs.
(Yes I am shocked!!)

It appears in the magazine Interface Age.

Unfortunately it is no the whole magazine.
Archive.org has this mag in their archive
by not this particular issue.

Are there any other articles written by him
for the Apple I, or II?

Link is below:

http://www.ataricompendium.com/archives/magazines/interface_age/interface_age_oct76.pdf

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Apple II

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