Apple II

SVA 'ZVX4' 8-inch disk controller card?

Submitted by PraetorX on August 5, 2025 - 11:49pm

Does someone here in the group has the SVA (Sorrento Valley Associates) ZVX4 disk controller card for 8" disk drives?  If so, I am hoping to get the firmware code off of the card.   This would be the code present at $cX00-cXff (X being the slot it's located in) as well as the switched-in card expansion ROM area at $c800-$cffe. 

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Apple II

Apple //c Apple IIc Plus

Submitted by Khaibitgfx on August 5, 2025 - 4:53pm

I'm looking for good quality photo images of the mainboards from the 2c and 2c plus in anyone has them, everything online in the search engines is crapolla.

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Apple II

Apple ][ slot extender

Submitted by Crusty on August 5, 2025 - 10:10am

I have found that the slot extenders for the Apple 2 have been out of stock for some time now.

So I designed a PCB with Kicad and had 5 cards made by PCBWAY .

All worked well but the card edge to fit the slot was a little to short at each end and whilst it was electrically sound did not sit well with me as a finished product.

So a second version has been run up in Kicad and hopefully the card edge to slot will now be a snug fit.

Whilst I do not intend to sell any of these slot extenders, I will make the Kicad files avaiable on GitHub if any one is interested?

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Apple II

Apple II Custom Bootloader

Submitted by VIBR on August 4, 2025 - 7:56am

Hello All,

to continue the series around the smartloader for the smartdiskII, 

Currently, I am leveraging Prodos 8 to start my compiled code. 

I guess i do not need to have the full version of prodos and my objective is to gain loading time. 

What I have in mind, is to have a custom version of DOS with only RWTS and my program to use basic RWTS routines.

Where do I need to write my program in the disk to only have RWTS and then jump to the start of my program ?

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Apple II

Apple II soft reset detection on DISK II

Submitted by VIBR on August 3, 2025 - 7:33am

Hello all, 

I have added a menu loader to the SmartDisk II (stm32 floppy emulator), and it is working great, 

 I would like to detect an Apple II soft reset on the Smartdisk II and my approach would be to count the step motor phase reinit, but it is a bit dirty, 

Is there a better way to detect a soft reset on the Disk II interface ?

Thanks 

Vincent 

 

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Apple II

Apple ii memory select.

Submitted by Maxplayz on August 2, 2025 - 1:00pm

Hi guys i don't understand how to wire up the memory select dip forks for the apple ii. I already have one completed row of TMS4116-15NL in row C from C3 to C10 but I'm unsure how to configure it to work. I think I currently have about 16KB of RAM so far

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Apple II

Component ID for blown ?capacitor?

Submitted by bdazzler on August 1, 2025 - 7:16pm

Hi,

 

I'm just getting started trying to restore an Apple IIe. I replaced the powersupply with one from ReactiveMicro, and when I turned it on I got a sickly sweet smell which I'm guessing means something blew on the motherboard.I haven't done any multimeter or oscilliscope testing but this component looks blown so I'll try to get a replacement before starting troubleshooting further. Can anyone provide an ID? TIA!

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Apple II

where is the RTC chip on IIGS logic board?

Submitted by dorkbert on July 26, 2025 - 9:23pm

Reactive Micro identifies the Apple part number as 344-0040, but I was unable to locate it after a coarse search of the board.

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Apple II

Apple IIe out of memory

Submitted by zulizu on July 23, 2025 - 2:10pm

Hello everyone,I'm trying to bring my Apple IIe back to life, but I'm getting an "out of memory" error, and I’m not sure where to start troubleshooting. :(

Has anyone encountered this issue before or can point me in the right direction?

Sometimes when I start the computer I'm getting this startup screen

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Apple II

Anyone using BMOW Yellowstone 3.5 drive controller for Apple Pascal

Submitted by old_hitech on July 22, 2025 - 12:09pm

I would like to run Apple Pascal on my Apple II+ computer with a 3.5 drive. I like the amount of storage and speed of the 3.5 drive when I run Apple Pascal on my Apple IIgs. I'd like to try it with my Apple II+. I'm not sure if the BMOW Yellowstone card supports Apple Pascal with a 3.5 drive with an Apple IIgs+. Has anyone tried this? 

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Apple II

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