A collection of articles and projects around the Replica 1.
|REBUS Replica 1 Hardware Extensions
ACIA, Flash, Apple II sound
|Apple II sound circuit|
|Replica Quick reference by Jeff Trenter|
|Krusader Ken Wessen’s assember IDE
Archive with many variants, sources, versions
|Krusader 1.2.1 source for use with an ACIA|
|Applesoft Lite archive|
|EWoz extended WOZ monitor with hex file upload|
|Jeff Tranter’s large collection of 6502 articles
Micro-KIM, Replica 1, and much more. A real treasure collection, original here!
EEPROM programmer circuit (as featured on the Multi I/O board)
Here’s a 1 chip EEPROM programmer for somebody wishing to copy their EEPROM or create their own data. In keeping with the replica 1 theme, it is a down and dirty solution requiring few connections. All the connections listed on the EEPROM go to their listed connections. A 74LS00 is all that is required to program an EEPROM.
This attaches to address A000-BFFF and is direct addressing. Simply write to the address to store the data. You should give a slight delay after your write since it takes 200ns to write a byte into an EEPROM. I do a short loop in basic
FOR I=1 TO 2:NEXT I
That does the trick. I tested this circuit out and had 0 errors when writing.
The late Andrew Jacobs set up a web site with relevant 6502 information. It is lost now. This site is reproduced here...
https://www.youtube.com/watch?v=FY4wjTuzkM8 1979 - Educational trainers Educational instruments division was the...
Tiny Basic Tom Pitman's Tiny basic. Small enough to fit in the 1K KIM-1, yet a real Basic interpreter Ti...
1977 01 Tiny Basic a mini language for your micro 1977 01 What's that Digital Group Really Doing ...