on the 6502 it was simple to save silicon (afaik) sub was infact a + ~b (and as we all know -b is (~b +1)) so having the carry as ~borrow there is no need to...
Mike Wynn
mike.wynn@...
Apr 1, 2003 8:18 am
13865
... You must mean that SBC was (A + ~B + C) = (A - B - 1 + C) = (A - B - borrow). SUB has to include the 1 adjustment or else its just *wrong* :-) Note also...
Eddie Edwards
eddie@...
Apr 2, 2003 12:01 am
13866
you completely missed my point. i was pointing out the problem with operating the carry bit in this manner. ... From: "Groepaz" <groepaz@...> To:...
Morten Pedersen
escapekey@...
Apr 2, 2003 12:02 am
13867
Hello, I messed around with GBA development about a year ago, and I used this thing called HAM. Is that still around? Is it compatible with devkit advance...
... well eh :o) i just see no "problem" here at all :o) (or the point where the behaviour is not consistent for that matter). the fact that your calculation ...
Mappy 0.9d is the 4th release of the Mappy Virtual Machine and the first release to be Open Source. The complete source code to both the Mappy VM user...
... yes, I was taking about the old 6502 (history of the Arm being the replacement for the 6502 in acorn computers) (still it was sbc without the sub etc etc)....
Mike Wynn
mike.wynn@...
Apr 2, 2003 2:43 am
13871
Apparently, Devkit Advance R5 Beta 2 (which just popped up on SourceForge.net) doesn't recognize "siw.text.iwram.o" and "gbmxr.text.iwram.o" as object files...
Damn, I was hoping I wasn't going to have to do that - Ideally there would be a way to make the cygwin gcc compile agb stuff (ie, compile my own devkit advance...
... From: "Damian Yerrick" <d_yerrick@...> To: <gbadev@yahoogroups.com> Sent: Wednesday, April 02, 2003 1:38 AM Subject: [gbadev] Devkit Advance R5...
Jason Wilkins
fenix@...
Apr 2, 2003 9:43 am
13874
I think I know what the problem is. Yesterday, I was working on Beta-3, comparing the latest Jeff F lnkscript and my new linkscript to see if I left out...
Jason Wilkins
fenix@...
Apr 2, 2003 10:00 am
13875
HAM ist just a simply GCC function collection and it is still not compatible whith something other as an gba ARM. No SGATE, no GB32. greets Tharo Herberg ...
... whoa :-) hold on , there is some big confusion here... Hi, this is Emanuel, I develop HAM, you can get it at http://www.ngine.de . HAM is a product that...
... Here's what I do, which works on devkitadv R4 and devkitadv R5 beta: 1. Put devkitadv in PATH (one batch file) 2. Put mingw in PATH in front of devkitadv...
... You haven't pointed out any problem at all. What *is* the problem with operating the carry bit in this manner? If there's a genuine problem with the ARM...
Eddie Edwards
eddie@...
Apr 2, 2003 5:20 pm
13879
of course this might very well be purely academic, but the result is still incorrect regardless of how you turn it. ((0-0)+0+(c)) should never result in 1. as...
Morten Pedersen
escapekey@...
Apr 2, 2003 11:36 pm
13880
... Academically, does Peano arithmetic define 'c'? What's incorrect academically is to use the carry flag for anything other than carrying from less...
... Can you justify why the carry flag should be set in this case? ... I confirmed that this is does occur (at least in the VisualBoy emulator). This is not...
... You're simply labouring under a misunderstanding of how carry flags work. The only thing incorrect here is following SUBS with ADC. There is no meaning to...
Eddie Edwards
eddie@...
Apr 3, 2003 2:16 am
13883
... This really perplexed me so I tried it out myself as a sanity check. I was unable to reproduce this behaviour either in VBA or on the hardware. ?!?...
... "supporting" the gp32 is a matter of new linkerscript and crt0 (which are both available on the net in several variations). no special gcc is needed, i am ...
Is there a quick and simple test for detecting the SP version ? over the older GBA? I have a help page screen that lists controls for GBA, and wish to display...
I'm using HAM exclusively for GBA development. I ignore the Hamlib for the most part and compile any public domain GBA code with it, including program I write...
... OK, I can't reproduce it now with the same conditions as before, so I retract my complaint. If I investigate again, I will confirm on actual hardware. It...
Given the title of this list, who cares about SGADE or GB32? I sure don't. Oh yeah, HAM doesn't compile for PS2, Xbox, or GC either...so it is pretty limited...
i cant reproduce it either so i probably forgot the s bit or something anyway, cheers all ... From: "Chris Hayton" <chayton@...> To:...
Morten Pedersen
escapekey@...
Apr 3, 2003 9:36 am
13891
Hi, I'd like to connect the GBA to a GPS receiver through the serial port of the MBV2 cable. The MBV2 FAQ says: "In order for the MBV2 to transmit serial data...
Hi Jay, ... Both correct. CMP is *exactly* just SUBS without a destination register. ... <=> BCC. ... Well you should avoid BCC/BCS except (a) after ADD and...
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