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Old 08-23-2009, 06:42 PM
TomL_12953 TomL_12953 is offline
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Default Loading BASIC With Tera Term

For those using Tera Term on a PC as a terminal to their Altair: I've found that sending the .tap images of the BASIC interpreter to the Altair is much more reliable when I increase the Transmit delay (in Serial Port setup) to 300 msec/line. If you've been having problems getting BASIC to load without checksum errors, try playing around with the character and line delay parameters. Of course I wouldn't have to do this if Grant sent me the ACR board and tapes!

Tom Lake
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Old 08-23-2009, 07:23 PM
marty marty is offline
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Talking Loading Basic

Hi Tom and All;
I am wondering What Baud Rate are you using , Tom ? The Last time I used to load up Basic, once I got the BUGGS worked out, I didn't have any trouble, I was sending at (If I remember right) 4800 Baud, with no character delays, but If it Helps I will have to try it.... You know that if you go back to Tape you will be STUCK at 300 Baud, Unless you use a different tape interface, like the Sudding tape system that went at 1100 Baud.... Or a Meca Alpha 1 that had higher tape rates, I don't know what the transfer rate was , But it loaded an operating system in seconds, If I remember right.... I hope someday to get it going again... Then of course there is Disk Systems....
Also I am Wondering What All you have as a system, what all is in it ? You can send me a private note if you like , rather than post out in the open...
THANK YOU Marty
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Old 08-23-2009, 08:51 PM
TomL_12953 TomL_12953 is offline
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Default

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Originally Posted by marty View Post
Hi Tom and All;
I am wondering What Baud Rate are you using , Tom ? The Last time I used to load up Basic, once I got the BUGGS worked out, I didn't have any trouble, I was sending at (If I remember right) 4800 Baud, with no character delays, but If it Helps I will have to try it.... You know that if you go back to Tape you will be STUCK at 300 Baud, Unless you use a different tape interface, like the Sudding tape system that went at 1100 Baud.... Or a Meca Alpha 1 that had higher tape rates, I don't know what the transfer rate was , But it loaded an operating system in seconds, If I remember right.... I hope someday to get it going again... Then of course there is Disk Systems....
Also I am Wondering What All you have as a system, what all is in it ? You can send me a private note if you like , rather than post out in the open...
THANK YOU Marty
No secrets here! I have a Stockly Replica with a 2SIO, CompuPro RAM 17 64K static RAM card, 2K EPROM board. I'm using port 1 of the 2SIO at 110 baud so I can use it with my ASR-33 Teletype once I get the ACR. I *REALLY* don't want to load over 16000 characters of Extended BASIC (with checksums, etc) at 110 baud but 300 baud is OK by me. If I use a different cassette board, it won't be compatible with MITS tapes. As for trying different delays, if you're having no problems, don't bother! You're fine!
Thanks for the reply.

Tom L
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Old 08-23-2009, 09:27 PM
marty marty is offline
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Talking Loading Basic

Hi Tom;
THANK YOU for your prompt reply !!!! I have a ComuPro Ram 16, but I have not had it working, But I have a Tanner 64K , with Selectable upper Ram Dis-able, and I can switch off at E000, E800, F000, or F800. and I can also switch for Phantom.... I had to Cut the Traces at pins 20 and 70 as they were tied to ground.... But other than that I like the Board and it has been no problem.... THANK YOU Marty
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  #5  
Old 08-24-2009, 07:05 PM
phe phe is offline
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Default

Hi Tom,

This is great news. How do you have the 2SIO board set up (which port is RS-232 and which is current loop? I'm assuming you load basic via RS-232 and then switch the system somehow so the teletype (current loop) becomes the console? How do you switch from one to the other?

I never got this to work, but really would like to try it.

Paul
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  #6  
Old 08-25-2009, 12:10 AM
TomL_12953 TomL_12953 is offline
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Quote:
Originally Posted by phe View Post
Hi Tom,

This is great news. How do you have the 2SIO board set up (which port is RS-232 and which is current loop? I'm assuming you load basic via RS-232 and then switch the system somehow so the teletype (current loop) becomes the console? How do you switch from one to the other?

I never got this to work, but really would like to try it.

Paul
Originally I had Geoff set up the board for port 1 being TTY and port 2 being RS-232 but port 1 never worked right. I had him convert it to RS-232 as well and now use a B&B Electronics Serial to Current Loop converter. It works perfectly. After BASIC is loaded from Tera term, I just unplug cable from port 1 on the back of the Altair (the one that connects the Altair to the PC) and replace it with one connecting the Altair to the Teletype (still at 110 baud). The Altair never even knows a switch has been made and from then on all I/O is done with the ASR-33. This is a temporary measure until Grant can get the ACR cassette board set finished. Then I can leave the TTY connected and load BASIC from cassette.
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