Apple II

Apple IIe + Z80 Softcard : IN & OUT Z80 statement

Submitted by Wawavoun on April 3, 2023 - 11:01am

Hello,

My question is almost in the subject.

I want to run some assembly code on a Z80 located in a Microsoft Softcard.

This code include IN and OUT statement followed by a 8 bits address. I believe these instructions use the lower byte of the address bus and the ioreq pin of the Z80 to say to the hardware that this operation do not involve the memory but some special io devices.

On the Microsoft Softcard a quick look at the schematic show the ioreq pin is not wired... So I think IN and OUT instructions has no chance to work. Can you confirm ?

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New Win98SE system: command-line disk-handling?

Submitted by Harry Potter on April 1, 2023 - 8:44pm

Hi!  I recently received a Windows 98SE minitower and am hooking it up right now.  I want to do some work and game-playing on it and my work includes programming using cc65.  I should soon install CiderPress on it but might need to add files to Apple2 disk images from a batch file.  Where can I find such a utility?

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Apple II

Question about weird thing in the MMU schematics

Submitted by frozen signal on March 31, 2023 - 8:20am

Hello everyone, I have recently found my old Apple IIe computer in my father's garage. That led me down a rabbit hole and I am now trying to understand the schematics of the MMU.

These:

Apple IIe - Schematic - MMU Logic - 1 of 2

and

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Apple II

Alignment diskette (P/N 090-0004)

Submitted by hackerb9 on March 28, 2023 - 5:37am

I'm following along with the Apple Service Level 1 Technical Procedures manual that describes how to test a Disk II analog board. However, when I get to step C, Azimuth Test — see images below — I'm stuck because it  requires the Alignment Diskette (Apple part number 090-0004).

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Apple II

Apple ][e PAL video circuit. Help please

Submitted by Ronin47 on March 27, 2023 - 4:59am

I'm not sure if anybody would be able to help, but I am trying to find some voltage readings from an Apple ][e PAL version. Specifically I am after voltage readings from the TCA 650 (UA13) that forms part of the video circuit, and specifically I need voltage readings from:

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Apple II

Speeding Drive a funny one....

Submitted by youngie on March 27, 2023 - 3:35am

Hi Folks,

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Apple II

What the heck is up with this weird IIGS?

Submitted by CT100 on March 27, 2023 - 12:51am

Just saw this on eBay and.. it makes no sense. https://www.ebay.com/itm/125774565342?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=qXhsAtPpQCW&sssrc=2349624&ssuid=YQKtlshQRbK&var=&widget_ver=artemis&media=COPY

 

The guy has a W65C02S8P-10 installed in the CPU socket.. and claims it runs GS/OS..

 

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Apple II

Floppy disk : write problems on Apple IIc

Submitted by The Saint on March 23, 2023 - 10:49am

Hello !

On my IIc :

- No problem reading floppy disks

- When I try to format (from Copy II+ by example) : heavy noise from the drive then message indicating that my floppy disk is certainly write-protected...

- And if I delete a file on the diskette, it is rendered unreadable...

And same problem with my external drive that I cleaned.

To sum up, no reading problem but impossible to write on the floppy disks...

If anyone has an idea... 

 

Thanks in advance !

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Apple II

Disk II rainbow ribbon cable color pinout

Submitted by hackerb9 on March 22, 2023 - 1:23am

Hi everyone,

I'm just doing a simple 20-pin IDC cable replacement for an old Disk II drive clone (technically a "Fourth Dimension Super Drive") and for fun wanted to use a pretty rainbow colored ribbon cable, like what the older Disk IIs used. But, Wikipedia's entry for the Disk II pinout colors seems to only cover the 19-pin Unidisk-style connector, so the colors for pins 17, 19, and 20 are likely incorrect. I'm guessing they should be violet, white, and black, respectively. Can anybody confirm that?

 

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Apple II

Jailbars/vertical white lines on Apple II plus

Submitted by DerpymanMT on March 21, 2023 - 4:09pm

Hi, I have an Apple II plus that only displays vertical white lines. Ive tested almost all the chips with my TL866 II plus programmer besides the 9334 chip. Ive tested with only the Autostart rom, nothing. Ive replaced sockets, replaced the CPU, and still nothing. CPU is attempting to do something, and has the right clock speed.

 

I have no clue what to do next. Im new to Apple Computers, but familiar with retro computers and their operations. No beeps, no clicks, nothing.

 

Im unable to test with my logic analyzer due to it being broken.

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Apple II

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