Apple II

Apple ][+ no graphics mode

Submitted by Signal64 on June 14, 2019 - 4:26pm

Hello All,

 

I'm trying to revive a Rev D RFI Apple ][+ board and running into an issue.

I can't get it to flip into either lores or hires graphics mode.

 

HGR command just returns to a viewable prompt and GR will display text garbage (where graphics is expected) with the normal viewable prompt and text lines at the bottom.

I can switch back to TEXT mode fine.

 

Going through W. Gayler's "The Apple II Circuit Description" (Chapter 8) the 74LS151 at A9 seems to handle the soft switches.

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Dram Memory Tester. Anybody use the following?

Submitted by NovellNetware on June 13, 2019 - 10:00pm

When I first started working on computer we had a dram tester. Simple little box with a button for testing and a knob for speed. Lock in the chip to set the speed and hit the buttons. Simple red / green light tells if it passed or not. I found out by pushing the speed up a tad more. It weeded out bad or questionable chips. Luckly this was at the time dram was cheap due to being replaced with simms. I'm looking around just in case I need one to trouble shoot the ram in my Apple II+ When I get it. I found this on e-bay.

 

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The Fun Of Old Your First Computer and other Books.

Submitted by NovellNetware on June 11, 2019 - 9:15pm

One of things I did was collect a very small amount of vintage computer books. For example the on in the Title. Your First Computer. We are talking 1976-(say) 1985 books or so. The book I was looking at the other day had an apple II in it. I never paid attention. I always thought it was a 2 plus. It is one of the later Apple II since it has air vents in the side. But the book and the picture explained it was just an apple II.

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PSU Recap Question on Values

Submitted by KLund1 on June 10, 2019 - 9:13pm

Hi all,

  I just received a recap kit from Console5.com. A very good site for such items! I ordered the kit for the model AIIe I have, AA11040-B.

I started to remove caps, and noticed the replacement caps values are different. I am not a EE person and do know too much about what the values mean. I have read you should replace caps with same or better.

The large caps on the high side show 100uf 250v. The replacement caps is about 1/2 the size and shows 47uf 250V. Can I use these?

Just want to verify.

Thanks

 

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Apple II

Apple II Europlus - is all I need a startup disk?

Submitted by pete_r on June 8, 2019 - 4:05pm
Hello all - this should be a very easy question to answer for any Apple II owners. I have an Apple II Europlus with two disk drives - all clean and working OK however when I power the computer up all I get is Apple ][ on the screen and drive zero searches for a disk (which I don't have). As I've not used an Apple II since around 1980, I'm guessing it's searching for a startup disk. Is that correct, or should an Apple II be able to start up and display a prompt without a disk in the drive?
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Apple II

Apple IIe Memory Issue

Submitted by 8bit_SchoolBus on June 8, 2019 - 12:33am

 

Solved!

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Apple II

HELP! with new PEEK/POKE location post compile

Submitted by jlafleur on June 5, 2019 - 3:04pm

I have an Applesoft program that PEEKs/POKEs at 125 and 126 for the "next DATA line".

When I compile the software, it seems that the location of that counter changes and the program continues to PEEK/POKE at the 125/126 location, only the results are useless because it now stores that counter in another location.

I am using the Einstein compiler which seems to be the only one working for me/most ideal for my situation)

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Need help with PEEKing the text screen

Submitted by gmontag451 on June 5, 2019 - 10:00am

I'm trying to convert a BASIC program which PEEKs the text screen, and I'm having a really hard time figuring out a similar formula for the Apple II. The original computer stores screen memory sequentially from top left to bottom right. But the Apple skips seven lines after every 40 characters (that's not entirely accurate, but you probably know what I'm describing.)

 

Beagle Bros has a short routine to solve this by positioning the cursor using HTAB and VTAB, then PEEK to find the memory location:

PEEK (40) + PEEK (41) * 256 + PEEK (36)

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Apple II

Finally got a Apple II+ With Goodies

Submitted by NovellNetware on June 3, 2019 - 10:58pm

I guess my entire post was not posted with pictures. So I'll attach the pictures and leave the story telling for another day.

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Apple II

Giveaway

Submitted by kwc on June 2, 2019 - 9:15am

Fellow Apple II people,

Giving away the following hardware to whoever can come and pick it up.

Floppy Drives

2 – 5 ¼ – A9M0107

1 – 5 ¼  - A9M0104 – Unidisk

2 – 3 ½ – A9M0106

Monitors

3 – A2M6014 – Applecolor RGB

2 – RGB cables

1 – A2M6016 – Monochrome

Everything is in working order, at least it was 5-6 months ago. There may be some non-working floppy drives in the garage as well.

I'm located in the Phoenix, AZ area.

Contact at sdspitfire at hotmail dot com

 

Ken C

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