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Re: The 1 wire solution to the Wall Wart ACI issue..

I played around a lot with hysteris and different values for the resistor. a 27k instead of the 47k did do a better job according to my Oscilliscope, but in practical terms not enough to justify changing the design.

Cheers,
Corey
by Corey986
Jan Tue 08, 2013 11:42 am
 
Forum: Troubleshooting
Topic: The 1 wire solution to the Wall Wart ACI issue..
Replies: 7
Views: 14984

Re: The 1 wire solution to the Wall Wart ACI issue..

One more thing to add is if anyone is going to try this... I only needed a volume level on my Panasonic rq2102 of about 4.25. You don't need a ton of volume. Actually more volume is worse because you get hum and distortion. That is why I was looking for a solution that works with a low volume. These...
by Corey986
Jan Sun 06, 2013 7:02 am
 
Forum: Troubleshooting
Topic: The 1 wire solution to the Wall Wart ACI issue..
Replies: 7
Views: 14984

The 1 wire solution to the Wall Wart ACI issue..

OK, I finally gave up on trying to get a consistent load with the ACI and ground instead of -12v. I got better results since I swapped out the eprom with one Vince provided that was programmed with a version of the Montior that has the correct intercept vectors that apparently Krusader messes up. Bu...
by Corey986
Jan Fri 04, 2013 7:02 pm
 
Forum: Troubleshooting
Topic: The 1 wire solution to the Wall Wart ACI issue..
Replies: 7
Views: 14984

Re: Serial number 1 for auction

Vince this is great and for a good charity. Good luck with with auction !!!

Cheers,
Corey
by Corey986
Dec Mon 03, 2012 7:03 am
 
Forum: Altair 8800 Micro
Topic: Serial number 1 for auction
Replies: 1
Views: 3627

Re: USB keyboards

The issue with USB keyboards using a ps/2 adapter is that they need to actually support the ps/2 protocol and speed. The little dongle adapter just re-wires the end. So your usb keyboard has to be made for the adapter. Newer keyboards typically don't bother. There are real adapter boxes that change ...
by Corey986
Dec Mon 03, 2012 7:01 am
 
Forum: Altair 8800 Micro
Topic: USB keyboards
Replies: 7
Views: 12236

Re: How many people have the "beta" cassette adapter working

I'm not convinced it is the EPROM, at least in my case, although I'd be happy if that is it. I've verified that I can consistently read my EPROM (e.g. running a program that calculates the checksum) and get the correct data. I've also tried using an EEPROM and running the ACI firmware out of RAM. I...
by Corey986
Nov Thu 29, 2012 12:30 pm
 
Forum: Troubleshooting
Topic: How many people have the "beta" cassette adapter working and
Replies: 9
Views: 16721

What IO port is the built in terminal/serial port

I want to do a little dev work on a bootloader and need to know if the built in terminal and serial port are at IO ports 20/21 like a real MITS SIO2 port 0.

Thanks,
Corey
by Corey986
Nov Wed 14, 2012 10:40 am
 
Forum: Altair 8800 Micro
Topic: What IO port is the built in terminal/serial port
Replies: 3
Views: 9466

Found my blue paint can...

OK I was looking for something else and found the can I though I threw out. The paint color is Rustoleum Professional Safety Blue #7524. This is a bit darker than the real Altair, but looks great with the black panel. If you really want the exact color of the Altair I have that paint mix, I had comp...
by Corey986
Nov Tue 13, 2012 11:24 am
 
Forum: Altair 8800 Micro
Topic: Found my blue paint can...
Replies: 8
Views: 13251

Re: New Altair logo artwork...

This looks great! As first step of customization I would also like to color the box of my micro. How did you manage to get such a clean edge of the blue color on the upside of the box? I once tried something similar but the color crept below the masking tape so the result was ugly - for that reason...
by Corey986
Nov Mon 12, 2012 10:49 am
 
Forum: Altair 8800 Micro
Topic: New Altair logo artwork...
Replies: 4
Views: 8600

Re: How many people have the "beta" cassette adapter working

Vince,

Any update on the replacement eproms?

Thanks,
Corey
by Corey986
Oct Tue 23, 2012 5:24 pm
 
Forum: Troubleshooting
Topic: How many people have the "beta" cassette adapter working and
Replies: 9
Views: 16721

Re: How many people have the "beta" cassette adapter working

I already went with 1% resistors and even swapped all the chips (except the proms) with a working Apple ACI. Still can't get it to work right on an Apple-1 or Replica-1. I do get better results on the Apple-1 since it returns to the monitor, but I get a bad load. On the Replica-1 it doesn't even ret...
by Corey986
Oct Wed 03, 2012 8:55 am
 
Forum: Troubleshooting
Topic: How many people have the "beta" cassette adapter working and
Replies: 9
Views: 16721

How many people have the "beta" cassette adapter working and

If yours works or doesn't work, please post your Replica-1 Version and experience...

Mine isn't and I am a revision 3 Replica-1 with ACI set to ground

I want to understand if the ACI is more consistent with different revisions....

Thanks,
Corey
by Corey986
Oct Tue 02, 2012 2:19 pm
 
Forum: Troubleshooting
Topic: How many people have the "beta" cassette adapter working and
Replies: 9
Views: 16721

Re: ACI Kit Arrived

Well, here is my update on my ACI not working.... I did replace my Replica-1 EEPROM with the EPROM. My replica-1 is the lastest revision. I am using a wall wart and tried it with an iPod classic (max, 90 and 80% volume), iPhone 4 (max, 90 and 80% volume) and with a Panasonic RQ2102 (At multiple volu...
by Corey986
Oct Mon 01, 2012 2:24 pm
 
Forum: replica 1 General Discussion
Topic: ACI Kit Arrived
Replies: 16
Views: 29374

Re: ACI Kit Arrived

Jeff, If I get a chance I will build mine today or Monday (World Maker Faire is this weekend, and my son didn't build the ACI last week like he promised). I was planing on using 1% resistors for the voltage divider just like the real Apple-1. If you want I can test by building with the 5% and create...
by Corey986
Sep Fri 28, 2012 7:02 am
 
Forum: replica 1 General Discussion
Topic: ACI Kit Arrived
Replies: 16
Views: 29374

Re: Voltage Chips Switched

Put lots and lots of flux on it, then try the solder sucker and maybe braid. I have noticed that the thinner solder needs a lot to flow and be sucked away. Just be careful and use a temperature controlled iron. You can easily lift some of these traces on the board if you out too much heat. If you ha...
by Corey986
Sep Thu 13, 2012 4:37 pm
 
Forum: Troubleshooting
Topic: Voltage Chips Switched
Replies: 1
Views: 6188
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