Forum: Kenbak-1
04-29-2010, 08:57 PM
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Replies: 4
Views: 57,721
I wonder if a Kenbak renovated by John himself...
I wonder if a Kenbak renovated by John himself would attract higher bids than a pristine one. I might be willing to pay a little more, but I guess that's a moot point since it will probably go for...
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Forum: Kenbak-1
04-29-2010, 08:04 PM
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Replies: 4
Views: 57,721
Well, it's actually his daughter who's selling...
Well, it's actually his daughter who's selling it, and I think she's likely to get more bids if she shows more detailed pictures. The picture of John with the machine is good, but interior and...
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Forum: Kenbak-1
04-29-2010, 05:57 PM
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Replies: 4
Views: 57,721
Original Kenbak on eBay
Auction id 320522921808
I've asked the seller to post some detailed pictures of the actual machine.
Geoff.
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Forum: Altair 8800
09-03-2009, 04:37 PM
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Replies: 2
Views: 29,473
Yes, you're right. A real 8800 will step one...
Yes, you're right. A real 8800 will step one full instruction at a time whereas Rich's emulator steps one byte at a time. There are a few differences (bugs?) in the emulator, but that doesn't...
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Forum: Troubleshooting
08-20-2009, 12:50 AM
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Replies: 4
Views: 55,234
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Forum: Troubleshooting
08-19-2009, 07:59 PM
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Replies: 4
Views: 55,234
The blinkenlights can be pretty subtle on an...
The blinkenlights can be pretty subtle on an 8800, and different memory boards can modify the effect. For example, MITS' 4k board tends to hold all the data lights on when a program is running. ...
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Forum: Altair 8800
07-29-2009, 05:38 PM
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Replies: 12
Views: 742,505
If you're getting this far, I don't think you...
If you're getting this far, I don't think you have a communication problem. What you show above is exactly what I get with 4k BASIC with 8N1 parameters. When you set it to 7 bits, do you also set...
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Forum: Altair 8800
07-29-2009, 02:14 PM
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Replies: 12
Views: 742,505
Yes, I brought out only the Tx & Rx lines and...
Yes, I brought out only the Tx & Rx lines and left RTS, CTS, & DCD disconnected. To keep the 6850 happy I tied pins 23 & 24 to ground.
http://www.solivant.com/misc_images/2sio_jumpers.jpg
...
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Forum: Altair 8800
07-29-2009, 01:41 PM
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Replies: 7
Views: 3,427,380
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Forum: Altair 8800
07-29-2009, 12:30 AM
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Replies: 12
Views: 742,505
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Forum: Altair 8800
07-29-2009, 12:26 AM
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Replies: 12
Views: 742,505
Hi Marty
I have posted an image of my 2sio...
Hi Marty
I have posted an image of my 2sio board here (http://www.solivant.com/misc_images/2sio.jpg), it should be big enough to make out the chip markings. It's populated only for RS232, I...
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Forum: Altair 8800
07-28-2009, 11:19 PM
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Replies: 7
Views: 3,427,380
Well, with the diodes installed as per the...
Well, with the diodes installed as per the silkscreen, no input signals were getting through to the UART. After I rotated them, the input was getting through,
but...
the pulses arriving at the...
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Forum: Altair 8800
07-28-2009, 08:13 PM
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Replies: 7
Views: 3,427,380
2SIO silkscreen error
If you're building one of Grant's 2SIO boards, be aware that the silkscreen is incorrect for D3, D6, D9, D12, D15 & D18. The cathode should be up toward the Molex connectors, instead of down as...
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Forum: Altair 8800
07-16-2009, 03:10 PM
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Replies: 20
Views: 8,272,579
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Forum: Altair 8800
07-16-2009, 01:51 PM
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Replies: 20
Views: 8,272,579
I don't know if you can. Like MBL, it may be...
I don't know if you can. Like MBL, it may be hard coded to port 1.
As for your current loop problem, I'm not sure what else to suggest other than sending the card back and I'll do my best to...
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Forum: Altair 8800
07-16-2009, 02:23 AM
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Replies: 20
Views: 8,272,579
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Forum: Altair 8800
07-16-2009, 12:02 AM
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Replies: 20
Views: 8,272,579
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Forum: Altair 8800
07-15-2009, 10:47 PM
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Replies: 20
Views: 8,272,579
No, unfortunately I don't have any current loop...
No, unfortunately I don't have any current loop devices. I did verify that the 6850 was working correctly by connecting a TTL/RS232 adapter to its Tx/Rx pins, so if there's a problem it must be with...
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Forum: Altair 8800
02-09-2009, 12:40 PM
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Replies: 28
Views: 278,751
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Forum: Altair 8800
02-08-2009, 10:59 PM
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Replies: 28
Views: 278,751
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Forum: Altair 8800
02-07-2009, 08:40 PM
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Replies: 28
Views: 278,751
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Forum: Altair 8800
01-31-2009, 12:16 PM
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Replies: 29
Views: 157,687
Dave Dunfield...
Dave Dunfield (http://www.classiccmp.org/dunfield/) has a copy on line. Click on the S100 link.
Geoff.
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Forum: Altair 8800
01-09-2009, 10:18 PM
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Replies: 1
Views: 16,370
I've never looked at the signals on the bus to...
I've never looked at the signals on the bus to see how noisy they are, but I've run my unterminated 18 slot machine for days at a time with boards all grouped together at one end as well as spread...
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Forum: Altair 8800
01-03-2009, 12:36 AM
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Replies: 13
Views: 623,718
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Forum: Altair 8800
12-25-2008, 03:49 AM
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Replies: 13
Views: 623,718
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