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Altair Replica and Stuff
The computer itself is performing flawlessly. The 2SIO, Port 1 is perfect. I hooked it up to a terminal program on a PC and can run VTL-2. That's a neat language for taking so little memory. On Port 0, though, the Teletype prints the OK message but I can't type anything. I checked my cable wiring about thirty times then hooked the Teletype up to the PC and was able to communicate with the Altair32 emulator and a terminal program OK so I know the Teletype is good. Any ideas what could be wrong? Did you have a 20mA machine there to test Port 0? If so it worked for you, right? Thanks again for your obvious care in the assembly and packing of this machine. I can't wait to get the Port 0 problem fixed and to get my ACR board from Grant.
Last edited by Grant Stockly; 07-18-2009 at 03:18 AM. |
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Geoff. |
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Hi Guys. I did not get my teletype working, but now you have inspired me. Sorry, Tom, but I cannot help you yet but perhaps I can if I get mine working.
My problem is that I do not know if my teletype is current loop or RS-232. Do either of you know how I can figure this out? Are there pin voltage settings I could measure? I've always held off because I did not want to take any chances of frying my 2SIO port or my teletype. Would a wrong (mismatched) connection cause harm? Paul |
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2SIO Failure
Well, I swapped the two inverters. The problem stayed where it was, the first port only. So both inverters are good. (You probably already knew that.) Where do I go from here?
TIA Tom Lake Last edited by TomL_12953; 07-16-2009 at 01:28 AM. |
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Tom,
You said earlier that you checked the teletype by connecting it to a PC. Does that mean you have a current loop port on your PC? Geoff. |
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BTW are there instructions somewhere for using the monitors, DBL, MBL and music ROMS I got with my system? I tried to load 4K BASIC into the replica using your instructions for the TeraTerm terminal emulator but have been unsuccessful. If I could use the MBL ROM to do it, I'd save having to enter the bootloader each time That's the point of the MBL ROM, no? 8^) Thanks again for your patience! Tom L Last edited by TomL_12953; 07-16-2009 at 01:29 AM. |
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Tom Lake Last edited by TomL_12953; 07-16-2009 at 01:33 AM. |
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Yes, you definitely want to use MBL instead of toggling a loader in each time. I tested the PROMs on your machine with my 2SIO and got 4k basic to load. You have to play some games with the front panel switches because 4kBasic interprets the sense switches differently from MBL, but it's still easier than entering a 1st stage loader each time. We can go over that when we get the port working. Just out of interest, did you try entering the simple echo routine on http://www.solivant.com/altair_bootl...oaders&pagen=1 ? If that won't work correctly we're not going to get VTL, MBL or anything else working on that port. Geoff. |
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Tom L |
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