Apple II

Monitor recaps: Need parts lists

Submitted by DistantStar001 on February 5, 2024 - 4:30pm

So I have three green phosper displays that need a recap.  The first is an Amdek 300, the second is an Apple Monior ///, and the last is a Kaga KG-12NU.  I also have an Apple Monitor II (the one with a tilt screen) that will fliker initilly, if left idle for an extended period, but stabolizes after a while.

Additionally, I have a Color/Composite Apple //c monitor that needs a recap as well.  Console5 has a kit for the //e model, but I don't know if that translates to the //c.

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Apple II+ Composite Video issue

Submitted by VIBR on February 5, 2024 - 11:12am

Hello, 

I have an Apple II+ with Video sync issues, 

Using a standard Apple composite monitor, I had vertical sync issues, and I changed a few ICs to fix it : 74LS161 x2 at D11 and D12, 74LS32 at C13 and 74LS32 at C14. 

Now the image is stable with the classic monitor. 

However when I use a Retrotink 2x pro, I do not get any sync (black screen). Using another Apple IIe I succeed with the retrotink. 

Is there any good document explaining step by step  to troubleshoot the apple II video sygnal using an Oscilloscope?

Where to start with ?

Thanks

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Apple II

PAL IIe cassette interface

Submitted by afrb2 on February 5, 2024 - 10:54am

I'm having trouble sending audio files to the cassette interface in a IIe PAL version. There are clearly some ciruit changes e.g. no 741, but half an MC1458 opamp seems to be the zero crossing detector.  Is the basic format (frequencies 1kHz/2kHz/ 770Hz) the same, or were there slight differences due to the different clock crystals in these machines?  I guess I could adjust the speed of the recording wav file slightly.

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Apple II

Unable to get serial started on IIe to use with ADTPro 2.1.0

Submitted by Sea-Apple on February 3, 2024 - 11:55pm

I'm new to the forum and just pulled my IIe out after being in storage for a long time. I'm using ADTPro 2.1.0 to create some disks, but am having some trouble getting the serial working. When I enter IN#2 and press RETURN, I don't see the APPLE SSC: prompt. What I get is a bracket and then a random character after that.

Example: ]p

I verified that the card is in the second slot from the left as you look at the machine from the front, the dip switches are set to SW1: 1001111 SW2: 1101100, and the jumper block has the arrow pointing up since I'm using a null modem cable.

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Apple II

RAM blocks architecture and total RAM amount

Submitted by jaymzleutz on February 3, 2024 - 6:00pm

Hello, gentlemen!

 

I am devouring the masterpiece Understanding the Apple II by Mr. James Sather and the Apple II Reference Manual as well.

So far, so good, but I am stuck on the total amount of RAM available and considered by the system. I am aware that the 6502 processor can read/write 8 bits at a time (8 input/output lines) but has 16 lines available for dealing with addresses.

 

My issues are:

1) If I have 3 rows of 8 columns with a 16k chip at each socket, how can I have "only" 48k of RAM?;

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Apple II

Case & power supply screws for //e

Submitted by softwarejanitor on February 3, 2024 - 3:05pm

I have a couple of //e units that are missing one or more of the screws that attach the bottom plate of the machine to the top part of the case and/or the screws that attach the power supply to the base plate.  Does anyone know the specs of the screw types so I can order some?  Maybe a suggestion on the best place to order a few dozen of them or whatever the minimum package size is?

 

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Apple II

Logical problem with Apple II europlus error and random freeze

Submitted by AppleWoz on January 30, 2024 - 7:36am

I turned on my europlus today after a long time and I randomly find these errors, what could it be? Thank you

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Apple II

simple //e cassette problem

Submitted by dcrowell on January 28, 2024 - 7:47pm

First post!  So I'm sure I'm gonna break a bunch of rules!  :^)  I did search the forum for this question before posting!

 

This is my first foray into the // world.  I got a new-to-me //e.  I installed a ReActiveMicro PSU before even turning it on.

 

It didn't come with any DOS disks.  I've ordered some on eBay.  But in the meantime I tried writing a few lines of basic and SAVE'ing them to cassette.

 

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Apple II

Saturn 128k Card testing without drives?

Submitted by jaymzleutz on January 27, 2024 - 10:24am

Hello, gentlemen!

After consulting Saturn 128k manual, this forum and other sources content I have the following question: is it possible to make a RAM/Card test at the 128k card without any input device where a program can run from?

I could not find any info about it and would really like to check if all the banks of my saturn card are working and if the 3 leds are ok as well.

Is it safe to run a CON command, as shown on reference manual, to set a memory state where the leds would light up, without any risk of changing anything permanently?

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Apple II

"New" Apple II+: strange cable, strange behaviour

Submitted by jaymzleutz on January 26, 2024 - 5:41pm

Hello, gentlemen!

Have already gathered a lot of info, checking this forum, but this is my first post.

 

Have just bought this nice Apple II+ on ebay. Seller shared a few nice pictures of everything working properly.

The package hit my place today and when I turn the Apple II+ on, the power light will not glow, just as will not the bulbs on some daughter boards (MicroModem and Saturn 128k ram). Motherboard beep is present.

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Apple II

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