Difference between revisions of "Talk:83Plus:BCALLs:50B3"
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==Working Code== | ==Working Code== | ||
I know this is probably trivial, but I was wondering if someone could please post a simple working example of what this BCALL does (meaning, not exactly a disassembly of the original TIOS code, but an example nonetheless) for those of us who feel BCALLing TIOS routine should be avoided whenever possible. ;^) [[User:Saibot84|Saibot84]] 09:38, 6 November 2006 (PST) | I know this is probably trivial, but I was wondering if someone could please post a simple working example of what this BCALL does (meaning, not exactly a disassembly of the original TIOS code, but an example nonetheless) for those of us who feel BCALLing TIOS routine should be avoided whenever possible. ;^) [[User:Saibot84|Saibot84]] 09:38, 6 November 2006 (PST) | ||
| + | |||
| + | :Something like this: | ||
| + | ''(on some versions, monkey with port [[83Plus:Ports:3A|3A]])'' | ||
| + | ''(monkey with port [[83Plus:Ports:04|4]])'' | ||
| + | ''(delay a bit)'' | ||
| + | in a,(2) | ||
| + | and 1 | ||
| + | jr nz,BatteryGood | ||
| + | res 5,([[83Plus:Flags:18|iy+$18]]) | ||
| + | jr Done | ||
| + | BatteryGood: | ||
| + | set 5,(iy+$18) | ||
| + | Done: | ||
| + | ''(restore port 4 and/or 3A)'' | ||
| + | bit 5,(iy+$18) | ||
| + | ret | ||
| + | :The different versions do different things to port 4; I have no idea what this means. | ||
| + | :On another note: I think these routines should be split up into separate pages. As it is it's not clear that 50B3 is the one that's documented (and has the official name Chk_Batt_Low) and is thus presumably the one TI recommends programmers use. It also needs to be pointed out that the boot code versions are only available on HW version 2 and above! | ||
| + | :[[User:FloppusMaximus|FloppusMaximus]] 14:40, 6 November 2006 (PST) | ||
Revision as of 15:40, 6 November 2006
Working Code
I know this is probably trivial, but I was wondering if someone could please post a simple working example of what this BCALL does (meaning, not exactly a disassembly of the original TIOS code, but an example nonetheless) for those of us who feel BCALLing TIOS routine should be avoided whenever possible. ;^) Saibot84 09:38, 6 November 2006 (PST)
- Something like this:
(on some versions, monkey with port 3A) (monkey with port 4) (delay a bit) in a,(2) and 1 jr nz,BatteryGood res 5,(iy+$18) jr Done BatteryGood: set 5,(iy+$18) Done: (restore port 4 and/or 3A) bit 5,(iy+$18) ret
- The different versions do different things to port 4; I have no idea what this means.
- On another note: I think these routines should be split up into separate pages. As it is it's not clear that 50B3 is the one that's documented (and has the official name Chk_Batt_Low) and is thus presumably the one TI recommends programmers use. It also needs to be pointed out that the boot code versions are only available on HW version 2 and above!
- FloppusMaximus 14:40, 6 November 2006 (PST)
