HP-41CY re-initialization ROM
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11-03-2019, 06:53 PM
(This post was last modified: 11-03-2019 09:32 PM by Jurgen Keller.)
Post: #11
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RE: HP-41CY re-initialization ROM
(11-03-2019 06:19 PM)PeterP Wrote:(10-27-2019 03:00 PM)Jurgen Keller Wrote: While doing further test runs I think I should also delete the polling vectors FF8, FF9 and FFA (or even more?) in all RAM pages of the active bank. I guess I should install a handler for FF9. I'll give it a try. Great to hear from you, Peter! Well, in my understanding, the polling vectors are not a problem anymore. The take-over ROM runs before the polling vectors (like I/O service) are called: The previous version of my module used the I/O service (xFF8) to take over control, and there I added some code to clear the polling points (copying some code from your RSU init module). But as I have moved on to the page #4 approach this is not needed anymore and the code got simpler. However, beware. I'm not an HP-41 OS expert at all so my understanding might be completely wrong. I still have a 41CY that's totally screwed up. I will use this one for final testing. If tests are passed I will publish the code here. |
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