A collection of articles and projects around the Replica 1.
Rebus
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REBUS Replica 1 Hardware Extensions ACIA, Flash, Apple II sound Ken Wessen |
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Apple II sound circuit |
| Replica Quick reference by Jeff Trenter | |
| Krusader Ken Wessen’s assember IDE Archive with many variants, sources, versions |
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| 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)
EEPROM circuit
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.