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#1
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Quote:
Quote:
When you run the echo test and hold down a key to send a stream of characters, does it echo correctly or does it garble or miss characters? If you're using TerraTerm to send the paper tape image, try setting an inter-character delay. I don't remember if HyperTerm lets you do that too. When the Altair is running the loader waiting for you to send the tape, the address and status lights should show a steady, unchanging pattern. Then when you start sending the tape, the lights should change to a different pattern and flicker slightly, though it may be pretty subtle. If the lights never change from their original pattern, my guess would be that the 2SIO is not receiving a full 8 bit data stream. If the lights do change then the loader found the start token, if it has trouble after that it will generally print some sort of error code. What loader are you using and what are you trying to load? Quote:
Geoff. |
#2
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2 sio
Hi Geoff;
I will make the modifications to the board , as shown in your picture.. Thank You... I am using the standard 2-sio loader and 4 or 8K basic with a .tap ending. (along with the cassette copies) and I have put all of them on paper tape, as a backup.... I have all of these files in a file on my computer, and yes I am using teraterm.... I will let you know what I find... THANK YOU Marty |
#3
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2 sio
Hi Geoff;
I got it to load at 4800 , but it has trouble with the letters on the screen, I changed it to 7 bits, but that made it worse, so I changed it back to 8 bits, then most of the letters seem to go thru... I reloaded it at 2400 baud , and it still does the same thing.... I will try it at 300 baud and see what happens.. THANK YOU Marty |
#4
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2 sio
Hi Geoff;
It does the same thing at 300 baud... here is was is shown on the screen: ( bit set to 7) >"TIU*)*(S W%E black square )H!UP'TJ black square [ with line in middle ( changed to 8 bits) WANT SI two parrellel bars ? black square ( used capital answers) WANt SI two parrellel bars ? N WANT RN-? N WANT SQ pii ? N 58317 BYTES FRE a large + sign [4K VERSION black rectangle 0 pii with line on top of it (if it is in lower case letter i have attempted to describe what is there.) ( or told what I did) THANK YOU Marty |
#5
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Quote:
Geoff. |
#6
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2 sio
Hi Geoff;
THANK YOU, THANK YOU !! I didn't remember reading that on the paper about boot loaders and Basic, I must have missed that part ... Also, I think that putting in the wires from pins 23 and 24 to ground was/ is a BIG part of solving the problem, before that it would only work in echo mode. THANK YOU Marty |
#7
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2 sio
hi Geoff;
That took care of the problem ... THANK YOU Marty |
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88-2 Sio | benalford | Altair 8800 | 2 | 08-28-2009 09:59 AM |