Blogs

All members are invited to blog on Applefritter. Weblogs should generally be of a technical nature and should be written in such a way as to still be readable and useful 50 years from now. Please do not embed outside media. Images and videos can be uploaded via the Media Browser. Files should either be attached to the blog post or uploaded to the file libraries.

When you post to your blog it will appear on this index and on your personal blog page. Once you've made a few posts, contact me about having a graphic added on the top of this page.

INFOCOM Spellbreaker

Submitted by Khaibitgfx on April 3, 2024 - 4:10pm

Infocom Printware - Spellbreaker.pdf

WIP: Tape Port Test patterns

Submitted by S.Elliott on March 28, 2024 - 4:42pm

Synopsis: an information-capture for work-in-progress

The Apple cassette save routines use the Y register to determine the pulse-width between signal edges, and there are seven distinct values for the Y parameter depending upon the context and state of the save routine.  For the purposes of studying the cassette routines, I named each parameter for its default value and tested their limits:

Tags: 
tape

A2USB: Apple II USB & Mouse Interface Card Emulation

Submitted by MacFly on January 1, 2024 - 10:19am

A2USB_Main2.jpg

What does an Apple II VGA Card, a Z80-CPM SoftCard and an USB-Apple II Mouse Interface Card have in common? Well, almost everything. All three are the same card. Same hardware. Just differing software. The magic of software-defined hardware. It can emulate many things. It just depends on software.

I started a project to add USB support to the Apple II - extending the PICO-based Apple2 VGA cards. The cards are based on excellent work by Mark Aikens, David Kuder and others. The hardware is using the surprisingly powerful and flexible PICO microcontroller. The first and most obvious application of the A2USB project is a complete Apple II Mouse Interface Card emulation, supporting a USB mouse.

Tags: 
#hardware #usb #apple

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