Apple II

DOS INIT I/O Error

Submitted by VIBR on November 9, 2025 - 4:37pm

Hello, 

I continue my quest with the Apple II Disk Emumation, 

I open a new thread to share with you a specific issue, I am facing with the Smartisk Floppy Emulator.

When doing DISKII Emulation, I am testing the write part and I have very strange behavior with DOS Init disk procedure.

 

Using an Apple IIe (with 2 different DISK II card):

- Boot DOS, and INIT HELLO => I/O Error both an real Disk II and SmartDisk emulator,

- Using LockSmith Cerify, Fast Backup, Backup => no issue

 

Using a IIGS no issue using DOS Init

 

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Apple II

DiskII & Smartport Logic Analyzer protocol decoder

Submitted by VIBR on November 6, 2025 - 1:52pm

Hello All, 

I have been developing 2 protocol decoder for sigrok / pulseview:

- Smartport

- DiskII

It can analyze each bit / byte/ drive sequence and log everything including nibble and denibble data on a log file and corresponding tag on the GUI

Sigrokprotocoldecoder

I have published my code on github and I hope it will help other people in this forum.

Vincent 

 

 

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Apple II

Making sense of Memory

Submitted by decuser on November 2, 2025 - 10:55pm

I have been reading dozens of memory maps trying to make sense of them and not having a huge amount of luck. It's all quite confusing. I'm hoping some of y'all might have the special sauce.

 

John Relay's Apple II Info site is about the best I've seen in terms of a simple map.

 

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Apple II

Smartport Question & Solution

Submitted by VIBR on November 1, 2025 - 10:13am

Hello all, 

I creates here a separate thread regarding Smartport behaviour. 

Smartport is not exaclty working the same between the IIGs, IIc & IIe

 

On the IIc & IIe via Smartport SP card, issuing PR #5 starts the smartport with the command 0x85 to init devices and start reading first boot device (id the lowest)

 

On the IIGS it is a bit different, at boot time it, it start checking the SELECT pin LOW and init device.

If he find not drive or no boot drive, then it start looking at C600 for boot disk

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Apple II

[VIDEO] Unleashing the Legend: The Apple IIe and the Disk II!

Submitted by Chris T on October 28, 2025 - 8:48am

Unleashing the Legend: The Apple IIe and the Disk II!In this episode, we're diving into a true titan of early micro-computing: the legendary Disk II floppy disk system for the Apple II. Designed by the brilliant Steve Wozniak, the Disk II wasn't just another peripheral—it was a seismic shift in engineering ingenuity. Its streamlined, cost-effective design fundamentally unlocked the full potential of the Apple II, tearing down barriers that shackled game devs.

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Apple II

Single Step in Monitor

Submitted by decuser on October 26, 2025 - 5:10pm

Hi all,

I'm not seeing it, but then again, I may be looking in the wrong place. Does the default monitor or the DOS 3.3. monitor do single step? If so, how? If not, what did folks do back when? Even the KIM-1 had single step, so, it must've been pretty common...

Thanks,

Will

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Apple II

What's the best Video solution for a Vintage Apple IIe in 2025?

Submitted by Chris T on October 15, 2025 - 7:33am

What's the best Video solution for a Vintage Apple IIe in 2025

Continuing our series on using an Apple IIe in 2025, today we are getting video working. Do we use a vintage monitor to get that authentic CRT look? Or do we use a modern flat screen? Another option is to use a modern Apple II video card. Yes, we can even use HDMI! Watch on to see the options you can use to rock 1977 hardware in 2025 and onwards!

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Apple II

Bit by Bit - Exploring Low-Level Programming on the Apple IIe

Submitted by decuser on October 10, 2025 - 7:18pm

All,

I've just created a new playlist containing my work on learning more about low-level programming on the Apple iie and posted about it on my blog:

https://decuser.github.io/retro/assembly/videos/2025/10/10/bit-by-bit.html

Here's a link the playlist:

https://www.youtube.com/playlist?list=PL_z8XUfqFSXHvJ5E5r80ZmMN7LRcCI0Zx

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Apple II

Help wanted testing softswitches

Submitted by arekkusu on October 9, 2025 - 1:32am

Hi folks, I'm fixing a few emulation bugs, and am hoping to find a volunteer to help verify behavior on real hardware.

Specifically, I'm looking for someone with:

  • an Apple //c or //c+
  • an Apple ][+

and the ability to run this disk image (i.e. with a BMOW floppy emulator, ADTPro, or similar).

This self-running disk contains:

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Apple II

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