Forum: Altair 8800
08-25-2019, 01:05 AM
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Replies: 0
Views: 265,484
Optima Cases
Does anyone know the contact information for Optima and the style of case they used for the 8800? I'm thinking of making a clone kit (not as detailed as Grant's) and I'd like to be able to use an...
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Forum: Announcements
10-21-2017, 10:54 PM
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Replies: 21
Views: 1,809,262
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Forum: Announcements
03-06-2017, 09:47 AM
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Replies: 21
Views: 1,809,262
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Forum: Altair 8800
08-04-2010, 11:51 AM
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Replies: 8
Views: 68,869
Price of Altairs
The high-end prices are for vintage Altairs, not replicas. A replica might go for about $2000.00-$2500.00 if it includes other boards and you catch the right buyer. As good a job as Grant did in...
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Forum: Altair 8800
05-30-2010, 10:41 AM
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Replies: 1
Views: 17,937
Bus Termination?
I have Grant's 18-slot motherboard and am having a great deal of trouble getting a known-good ACR board to work. Is it possible the bus has too much noise or ringing (I'm not a hardware person so I...
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Forum: Troubleshooting
05-24-2010, 01:35 AM
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Replies: 2
Views: 208,369
+5V Adjustment
My ACR is only reading +3.9V on the UART when it should be +5V. Does my power supply need adjusting? If so what's the best method? Do I remove all the cards and measure the bus lines? I don't...
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Forum: Troubleshooting
05-17-2010, 09:28 AM
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Replies: 2
Views: 46,100
I finally ot it fixed! the guy who fixed it...
I finally ot it fixed! the guy who fixed it said:
"The tape write section had some damage. It wasn't even generating a carrier tone. I had to replace 2 chips. They were both binary counters and...
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Forum: Altair 8800
04-29-2010, 06:37 PM
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Replies: 3
Views: 27,931
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Forum: Altair 8800
04-12-2010, 12:24 PM
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Replies: 0
Views: 210,436
Has Grant Come Back?
Someone has cleaned up this board and gotten rid of the SPAM! Is that you, Grant? Thank you whoever you are!
If you ARE getting involved here again, Grant, how about sending the ACR boards I...
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Forum: Altair 8800
04-07-2010, 12:57 PM
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Replies: 1
Views: 245,922
Altair 8800 Case
Try:
http://www.altair32.com/
Rich has an excellent Altair emulator and also has plans for a real front panel to interface with it. I use his emulator with a real ASR-33 Teletype. It works...
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Forum: Altair 8800
04-02-2010, 06:49 AM
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Replies: 3
Views: 27,931
Need Person to Repair ACR
I have an Altair ACR (2-board set) that puts out a very low level signal and doesn't read any commercial tapes. I've tried troubleshooting it myself with no luck so now I'm looking for a person who...
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Forum: Classifieds
03-31-2010, 12:16 PM
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Replies: 0
Views: 31,109
Need Person to Repair ACR
I have an Altair ACR board (2-board set) that puts out a very low level signal and doesn't read any commercial tapes. I've tried troubleshooting it myself with no luck so now I'm looking for a...
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Forum: Altair 8800
10-10-2009, 01:47 AM
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Replies: 8
Views: 68,869
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Forum: Classifieds
10-07-2009, 04:33 PM
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Replies: 0
Views: 28,457
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Forum: Altair 680
09-24-2009, 05:29 PM
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Replies: 6
Views: 50,059
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Forum: Altair 8800
09-14-2009, 08:37 AM
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Replies: 2
Views: 38,421
A New BASIC Tape
I just got a cassette of 4K BASIC version 4.0. Now I don't have to mess with having to stop and change the switch settings after loading the tape. I can create paper tapes of this version, too. I...
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Forum: Classifieds
09-09-2009, 02:26 AM
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Replies: 0
Views: 29,188
FS: Tenor Model 763 EPROM Programmer
I have a Tenor Model 763 EPROM Programmer for 1702 and 1702A EPROMS. It works just fine and is in good cosmetic condition, too. Pics available on request. List price is $950.00 (when new of...
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Forum: Announcements
09-08-2009, 03:53 AM
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Replies: 6
Views: 115,205
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Forum: Altair 8800
09-07-2009, 10:27 PM
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Replies: 3
Views: 17,468
ACR Woes
Sorry I haven't responded sooner, Marty!
Thanks for the suggestion but unfortunately I didn't hear
any difference in the signal when I changed the value of the
resistor (even replacing it with...
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Forum: Altair 8800
09-07-2009, 07:43 PM
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Replies: 3
Views: 17,468
Need Help with Programming Package II?
If you've downloaded the tape images of the programs in Programming Package II from the Altair32 site, you may have had trouble loading the monitor program (which needs to be done before any of the...
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Forum: Troubleshooting
09-01-2009, 01:04 PM
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Replies: 2
Views: 46,100
ACR Volume Too Low
What would cause the output of an ACR cassette interface to be very faint? I tried a friend's ACR board and when I plug its output into an amplifier and do a CSAVE from BASIC, I can hear the correct...
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Forum: Altair 8800
08-31-2009, 12:46 PM
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Replies: 2
Views: 38,421
BASIC Paper Tapes
Do you have a paper tape reader but not a punch? Do you want to re-create the agony/joy of an authentic vintage computer experience and load BASIC from paper tape the way God (or Bill Gates,...
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Forum: Altair 8800
08-29-2009, 03:05 PM
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Replies: 1
Views: 18,158
60 Hz Line Frequency
In the manual for the Real-Time Clock, it says that unrectified +16v has to be brought to pin 55 of the motherboard to use the RTC with the 60 Hz line frequency. I seem to remember reading here...
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Forum: Altair 8800
08-28-2009, 11:54 AM
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Replies: 9
Views: 60,266
Re: Loading BASIC With Tera Term
Oops! There's a difference in terminology here! I sometimes refer to the two ports on the 2SIO as Port 1 and Port 2 rather than Port 0 and Port 1 so my Port 1 would be your Port 0! OK, so I'm...
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Forum: Altair 8800
08-25-2009, 12:26 PM
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Replies: 9
Views: 60,266
I have the 232CL9R. It's quite easy to hook up...
I have the 232CL9R. It's quite easy to hook up (for me to be able to use it, it would HAVE to be!) Make sure you get a 12v power supply, too since the loops are passive (need external power) You...
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