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Re: replica 1 tenth anniversary edition

I like it, looks nice. Great work!

One beef though, the 40 pin header was really nice for hobbyist expansion. I do wish that was still there, without having to buy an expander.


Good luck, I hope it sells well :wink:
by wmmullaney
Nov Sat 16, 2013 11:32 pm
 
Forum: replica 1 General Discussion
Topic: replica 1 tenth anniversary edition
Replies: 18
Views: 38081

Re: usb regulated 5v for replica 1

The 12v and -12v signals were used on the original Apple I, but not the Replica I. They are retained for compatibility, the cassette card either requires or works better with those voltages. As long as you don't need them on the slot, you're fine. The computer can be powered from a 5v source, just p...
by wmmullaney
Nov Fri 08, 2013 7:10 pm
 
Forum: Creation Room
Topic: usb regulated 5v for replica 1
Replies: 1
Views: 5736

Re: Apple II-style audio

Hi Peter, As far as I know cowgod is still around, but here is the link just in case: http://cowgod.org/replica1/songs/ They are the rest of the common songs for ED that he so kindly converted for me a year ago. If you have the expertise needed, I would love to start porting SAM to the replica 1. Co...
by wmmullaney
May Thu 10, 2012 2:50 pm
 
Forum: Creation Room
Topic: Apple II-style audio
Replies: 3
Views: 10476

Re: SAM Port

Interesting, do you have an Apple II schematic you could send me? I haven't been able to find one. I wasn't aware that a DAC was even involved, that the sound was dithered directly from one of the flip flops. At least that's what my replica sound card looks like. Thanks for looking into it, I'm look...
by wmmullaney
Apr Sun 15, 2012 5:57 pm
 
Forum: replica 1 General Discussion
Topic: SAM Port
Replies: 4
Views: 11863

Re: SAM Port

Cowgod has designed the audio card and BASIC port already: http://cowgod.org/replica1/ It shouldn't be hard. I know the Apple 1 architecture well enough, but nothing of the Apple II. I would be glad to try learning if anyone else wanted to collaborate. I have the SAM disk image if anyone needs it. W...
by wmmullaney
Mar Sat 17, 2012 10:43 pm
 
Forum: replica 1 General Discussion
Topic: SAM Port
Replies: 4
Views: 11863

SAM Port

Hey everyone, I was thinking a port of the Apple II SAM to the R1 would be really cool, especially for demonstrations. Does anyone know how one go about this? It seems like it should be possible using cowgod's projects.

Thanks
by wmmullaney
Feb Tue 14, 2012 12:14 am
 
Forum: replica 1 General Discussion
Topic: SAM Port
Replies: 4
Views: 11863

Re: Clearing the screen

You could write a simple program to print 24 carriage returns in asm, but that would leave the cursor at the bottom instead of the top. Reset just points the PC back to the beginning of the monitor: $FF00, so a FF00R or 0: 4c 00 ff r in the monitor would do the same.
by wmmullaney
Jul Tue 26, 2011 12:33 pm
 
Forum: replica 1 General Discussion
Topic: Clearing the screen
Replies: 2
Views: 7294

Re: A question regarding the Apple I / Replica

Thy have the same processor, but completely different memory maps. Assembly code would need to be patched. On the other hand, simple applesoft basic code does run under cowgod's applesoft lite program. From reading about early owners, people did lots of stuff with them. Hardware hacks, wiring the s-...
by wmmullaney
Mar Sun 13, 2011 9:05 pm
 
Forum: replica 1 General Discussion
Topic: A question regarding the Apple I / Replica
Replies: 1
Views: 6403

Re: EEPROM Burner Question

Haha, oh, that makes sense. I didn't realize those were active low, shouldn't they have bars over them to denote that?

Thanks so much!
by wmmullaney
Jan Tue 04, 2011 4:25 pm
 
Forum: Creation Room
Topic: EEPROM Burner Question
Replies: 3
Views: 9460

EEPROM Burner Question

I've been studying the 1 chip eeprom burner circuit Vince designed with my limited electronics knowledge, and I'm stuck. Here is the circuit: http://www.brielcomputers.com/eeprom.pdf I understand the bottom half, that's all clear. With the top, it appears to enable the chip when the address range is...
by wmmullaney
Jan Tue 04, 2011 1:45 pm
 
Forum: Creation Room
Topic: EEPROM Burner Question
Replies: 3
Views: 9460

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