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.

Apple fest 1983 40th Anniversary Poster

Submitted by Khaibitgfx on March 8, 2023 - 3:35pm

The following file is standard poster size, and can be printed by whatever print shop nearest you.

 

Mysterious origins of the AP-64 EPROM programmer

Submitted by S.Elliott on March 6, 2023 - 9:18pm

Last December I posted in Apple II Cards about the utterly bizarre firmware of my APX-EPROM-1 Programmer, a clone of the AP-64e that was sold to me by Nexo Distribution in the 1980s.  The APX firmware changes, depending on which slot it's installed in:

 

Tags: 
EPROM
AP64

PRINTDCI quick-and-easy ASM printing routine

Submitted by S.Elliott on March 2, 2023 - 8:43pm

Synopsis

This short routine makes it easy to print strings from assembly code, or even from the mini-assembler.  (Especially in the Enhanced monitor, which lets you enter ASCII characters using a ` prefix.)

 

Detail

Assemblers like EDASM have a directive called DCI that encodes an ASCII string in such a way that the end of the string can be distinguished by checking its high bit.  The DCI statement converts your string into ASCII bytes so that most characters have the high bit cleared, but the last character has its high bit set.

Tags: 
asm

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