1 chip EEPROM programmer for the replica 1/Apple 1

What have you built or do you want to design to go with your replica 1

Postby foresmac » May Mon 08, 2006 4:20 am

That looks pretty sweet. Do you have a listing for the assembler? Maybe I'll get ambitious this summer while working at Whirlpool and make myself a new EEPROM. Looks like your assembler is really nice.

This project has been far more fun than any of the classes I've taken so far!
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Postby Kallikak » May Tue 09, 2006 12:16 am

I'm putting together a web page for downloading the assembler and manual and some associated bits and pieces right now. You can expect it to be available at latest next week.

I certainly find having an assembler in ROM very handy!

Ken
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1 chip EEPROM programmer for the replica 1/Apple 1

Postby fsafstrom » Jan Wed 03, 2007 2:47 am

I just spliced up an old IDE cable and I'm about to start soldering the EEPROM programmer.
The mapping from the Replica Expansion port to the IDE cables seem a little bit odd.
The thing is that the Data lines D0-D7 seem to be out of sync...

Did I get it right ???

Code: Select all
IDE cable mapped to expansion port.

01 -12            21 A14
02 +5             22 A15
03 +12            23 R/(W)
04 $C000-CFFF     24 $B000-BFFF
05 GND            25 $A000-AFFF
06 Phi 0          26 D0
07 A0             27 Phi 1
08 A1             28 D2
09 A2             29 D1
10 A3             30 D4
11 A4             31 D3
12 A5             32 D6
13 A6             33 D5
14 A7             34 RDY
15 A8             35 D7
16 A9             36 (IRQ)
17 A10            37 BA/SYNC
18 A11            38 (NMI)
19 A12            39 Phi 2
20 A13            40 (RES)
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Postby vbriel » Jan Wed 03, 2007 8:06 am

Image

Pin 1 is near the OSC on the replica 1 SE
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1 chip EEPROM programmer for the replica 1/Apple 1

Postby fsafstrom » Jan Thu 04, 2007 12:34 am

Got it...

I just built it and programmed my first EEPROM. :P
How fun is that...

I'll post a picture, but I got to figure out where I can host it first...

Anyhow, built it, double checked every connection twice, put in the 74LS00 and 28C64 and it worked on the first try.

I took the Krusader 1.2 (65C02.rom.hex) and uploaded it to memory location $6000-$7FFF in stead of $E000-$FFFF.
Then I just used the following little Basic program to program the EEPROM.

Code: Select all
   10 A=24576 : REM $6000
   20 B=-24576 : REM $A000
   30 FOR I=0 TO 8191 : REM COPY 8KB
   40 C= PEEK (A+I)
   50 POKE B+I,C
   60 FOR J=1 TO 2: NEXT J : REM DELAY FOR EEPROM
   70 NEXT I
   80 PRINT "DONE..."
  100 END


It even worked when I plugged the new EEPROM into the Replica... 8)

Thanks Vince!!!
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Postby vbriel » Jan Thu 04, 2007 1:47 am

Yeah, I think that really makes a great first little circuit. It is small enough to put together in a few hours and you can see the results just by reading the memory. Not only that, it makes it possible to modify BASIC safely!

I plan to publish more simple projects later when I have a breadboard ready next month. It will be a duel function wirewrap board or white push wire style. I plan to publish lots of I/O circuits involving the 6522 which has 16 I/O pins or the 82C55 which has 24 I/O lines! Lots of fun projects will be right at your fingertips.

Vince

PS try photobucket or just create a yahoo account and create a free webpage.
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Ugliest EEPROM programmer yet ???

Postby fsafstrom » Jan Thu 04, 2007 7:32 pm

Yes, this was a very simple project done in a couple of hours...

It's not going to win any beauty contests, but here it is...

Image

And in action...
Image

Cost, less than $20 and that includes the ZIF socket @ $8 and one EEPROM @ $5... ;-)
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