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

Where to get ANSITerm?

Submitted by djc6 on January 26, 2024 - 4:43pm

I purchased a WiFi Modem for my IIGS (this one https://tempestfpga.com/) but am looking for a copy of ANSITerm to use with it.

 

I've been able to use Spectrum to verify the modem works, but it seems ANSITerm works with ProDOS so it would be more convinient - i.e., don't have to wait for GS/OS to load and then Spectrum to load.I see it was for sale for a long while, even found ads for it from the early 2000's in Juiced.GS.  But I can't find any info about the company now - anyone know what happened or have current contact info?

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Apple II

Cards I'm building today SimpleSerial, DiskII and SmartDiskII

Submitted by softwarejanitor on January 17, 2024 - 4:32pm

PCBs came in yesterday from JLCPCB...  I'm building these three today...  SimpleSerial, a 6551 based SSC compatible card, DiskII, a Disk II controller compatible that uses EPROMs incstead of BiPolar PROMs and SmartDiskII, a card that is a LiRON workalike.  I am waiting for parts to come in to complete them but this is what is done so far.  I have 4 more PCBs each, not sure how many of them I will populate.  I don't really need anything but the DiskII cards.  I've already got a bunch of SSC cards and a LiRON and a couple Yellowstone cards so I have what I need there...  Just love building th

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Apple II

Apple DMP printer support and drivers for say System 6 and such.

Submitted by NovellNetware on January 17, 2024 - 12:12am

So I finally track down a RGB monitor and with it came the the APPLE DMP (dot matrix printer.). You know the one before imagewritter. According to the manaual perfect fit for

Apple II, II plus,  and III. Due to the centronics interface. Then later Apples like the IIGS start talking abtou the imagewriter or even imagewriter II. This is just as

frustrating with using a third party printer. In my case a Okidata 82a. The main questions I have. Does the DMP work with a Imagewriter driver? I double it would work with the imagewriter II.

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Apple II

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