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Its a 8 Chip design.
PCB size 160mm x 100mm
There are two Memorymaps available.
With Map2 the RAM Block $6000 moves to $E000.
A very powerful embedded Assembler will be available soon:
http://www.xs4all.nl/~sbp/projects/apple1/apple1.htm
-------------------------------------
JumperMode=HIGH (Map1)
-------------------------------------
A15 A14 A13 A12
$0000 0 0 0 0 4K RAM
$1000 0 0 0 1 4K RAM
$2000 0 0 1 0 4K RAM
$3000 0 0 1 1 4K RAM
$4000 0 1 0 0 4K RAM
$5000 0 1 0 1 4K RAM
$6000 0 1 1 0 4K RAM
$7000 0 1 1 1 4K RAM
$8000 1 0 0 0 not used
$9000 1 0 0 1 not used
$A000 1 0 1 0 4K USER
$B000 1 0 1 1 4K USER
$C000 1 1 0 0 4K USER
$D000 1 1 0 1 PIA I/O Control
$E000 1 1 1 0 4k ROM BASIC
$F000 1 1 1 1 4K ROM WOZ-MON
--------------------------------------
JumperMode=LOW (Map2)
--------------------------------------
A15 A14 A13 A12
$0000 0 0 0 0 4K RAM
$1000 0 0 0 1 4K RAM
$2000 0 0 1 0 4K RAM
$3000 0 0 1 1 4K RAM
$4000 0 1 0 0 4K RAM
$5000 0 1 0 1 4K RAM
$6000 0 1 1 0 not used
$7000 0 1 1 1 4K RAM
$8000 1 0 0 0 not used
$9000 1 0 0 1 not used
$A000 1 0 1 0 4K USER
$B000 1 0 1 1 4K USER
$C000 1 1 0 0 4K USER
$D000 1 1 0 1 PIA I/O Control
$E000 1 1 1 0 4k RAM
$F000 1 1 1 1 4K ROM WOZ-MON
It looks a lot like someone is benefiting from Vince's work...
Vince knows about my design and Vince mailed
me some nice ideas but i dit it different.
By the way: the design arround the 6502/6821 and
the Monitor is from Steve Wozniak.
I did not use any source-code from Vince !!!
Thats cool. The more products like this out there, the better.
I agree. This isn't my replica 1, it is a basic 6502 system made compatible with the Apple 1 similar to the replica 1. Franz uses gals for glue logic, I chose traditional TTL for the learning experience.
What we have in common is ATMEL AVR's, but programming is different. I used assembler, Franz uses bascom. So, there is no copying going on. Good work on the replica. There needs to be simple 8 bit computer kits for people to build and learn from. The hobby is slowly drying up.
Vince
Hi Vince,
yes, you are right with your words "hobby is lowly drying up"
but this comes, because the kids are growing up with PC,s
Very good news:
I am testing the embedded Apple 1 SB-Assembler, at this moment.
It looks great, and San Bergmans makes it available for running
on your machine, Vince.
I can run it in RAM at $E000 or in RAM $7000 or in ROM.
Therefore, it must be compatible with the A1 Replica and the A-ONE.
have a nice weekend
Franz