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Old 09-07-2009, 07:43 PM
TomL_12953 TomL_12953 is offline
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Location: Malone, NY USA
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Lightbulb 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 other programs in the package can be run) Here's a tip:

Using a hex editor on the PC, look at location 55 (hex) It should be 06 followed by a bunch of AE bytes. Change that 06 to AE, like the bytes that follow otherwise the loader routine will get confused. Now look near the end of the file for a bunch of 00 bytes. At offset CFA(hex) you'll see FB. Change that to 00. The tape will work without this second change but you'll have some garbage after the ? prompt. Changing the FB to 00 will eliminate the garbage. Also, if you DON'T have the serial board strapped for an interrupt, remember to raise A9 in addition to the terminal and load switches. The first time I loaded the monitor, I forgot to do this. The ? prompt printed just fine but I couldn't type anything. Shades of my old 2SIO problem! After reading the docs more carefully, I got it right, though.

I sucessfully created a paper tape using these changes and get a good load every time. Enjoy!

P.S. Grant, where's my ACR???

Last edited by TomL_12953; 09-08-2009 at 10:33 AM.
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