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Overflow Flag QuestionHello all, After a long hiatus (lost all code when my MacBook was stolen) i've gone back to the drawing board and am writing a Z80 emulator in REALb…
... have a question about the overflow flag.
I am ... 0x0050. This means that my overflow flag is being set when ... -
Q on overflow on subtraction of 2 numbers.I came across this bit of code (paraphrased for clarity) that set the overflow flag on subtracting two numbers: result = A - B; overflow = (((A ^ B)…
... for clarity) that set the overflow flag on subtracting two numbers ... />
result = A - B;
overflow = (((A ^ B) & (A ^ result ... is used to calculate the overflow result above. Could someone explain ... -
Overflow Detection while Scanning a Number from a StringI've got some strange behaviour from a subroutine that reads a number from a string and converts it to a 32-bit long. It's C's strtol if it helps to…
... but C99 requires detection of overflow so I am using a ... *base does not cause unsigned overflow (meaning carry out of the ... result+=digit can't cause overflow following this multiply (ie there ... -
Help me with this Stack overflow Freak Show.I am asking a simple question on Stack overflow and once again, the closed minded morons a pointing and tutting. I'm asking a question about C point…
... a simple question on Stack overflow and once again, the closed ... -
Assembler code from tutorial, problem!I was wondering if anyone could help me decipher this z80 assembler code? ORG 60000 LOAD 60000 EA60 21BCEA LD …
... up and into
this overflow byte or something??? I am ... -
Need help with my P flag!Not sure if I've emulated the P flag correctly when its comes to overflows. Here's what I've done: LD A,123 LD B,16 ADD A,B Twos Complement of 123 …
... higher than 127, causing an overflow and setting P.
If ...
-126 would caused an overflow as it passes
-128 ... sure I've done the overflow flag right.
Thanks ... -
Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... at all.
Buffer overflow maybe? The code doesn't ... -
SimCoupe 1.0 released[size=-2](for those of you that don't read CSS)[/size] SimCoupe, the SAM Coup? emulator, has been updated to version 1.0. This major release adds ma…
... failing to set carry for overflow, or H flag
- Fixed ... -
Integer RangesOK, I need a little help clarifying something. I am making good progress with the emulator so far - I've emulated most ADD, INC, DEC commands (as we…
... by working out if an overflow has occured or not. Is ... -
RZX reference samplesJust wondering, is it ok that neither Spin nor Spectaculator can replay the RZX reference samples provided on the [URL="http://www.ramsoft.bbk.org/rz…
... , reporting identical IN underflow or overflow errors. The samples can't ... -
16-Bit Binary MathsHi, I'm trying to figure a few things out regarding 16-bit maths (SBC HL, ss in particular). regHL is an UInt16 (unsigned 16-bit integer) in my emu…
... byte3Sign 0 ) then
// Overflow
SetPVFlag()
elseif ( ... br /> else
// No overflow
UnsetPVFlag()
end ... br /> else
// No overflow
UnsetPVFlag()
end ... -
EightyOne bug?I have been using EightyOne 1.0 to test my code using a Timex display mode. The code (a UK101 emulator) was released for CSSCGC2008 a couple of weeks…
... it corrupting the screen (stack overflow problem?)
I don ... -
Betadisk shematics & 48K-CPMHi out there, can someone help me out with the shematics for the Betadisk-Interface? I built one 17 years ago, it works fine till today, but I'm to …
... ten minuts with a stack-overflow as it seems (judging by ... -
Frank N SteinThis is an improved bugfix for [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0001849"]Frank N Stein[/URL] as discussed recently in [URL="htt…
... few levels due to stack overflow as the machine stack eventually ... (less serious) cases of stack overflow can all be fixed by ... -
CrusoePlease add the following "known errors" description for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0002872"]Crusoe[/URL]: [QUOTE]Bu…
... error was the machine stack overflow, caused by indirect recursive sub ... -
Amazonia (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027280"]Amazonia[/URL], please add the following "known errors" des…
... cdda9e call 9edah ; increment/overflow minutes
9ecf 3e19 ... cdda9e call 9edah ; increment/overflow hours
9ed4 3e1f ... cdda9e call 9edah ; increment/overflow minutes
9ecd 3e17 ... -
Scrimpy screensHere's a question - how small a window can you get away with as a playing area for an arcade/action game before anyone notices? From the very earlie…
... more at the sides as overflow areas for the sprites, and ... -
Screen2StringFurther to writing that BASIC one-liner to redirect CAT to a string I thought that I'd do a general redirection routine for anything which normally p…
Chuck Norris can!Rather amusing [url=http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags]post of Stack Overflow[/url] re…
... -contained-tags]post of Stack Overflow[/url] regarding parsing of HTML ...Can any C experts help me - have hit an impasseHere is an excerpt from my attempt to program a Bridge game in C. Can you spot where I'm goiing wrong? I am trying to count the points in each ha…
... a noob question to stack overflow!
[IMG]http://i1136.photobucket ...Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... multipliers (stuff that doesn't overflow) and unsigned below.
SpecBAS 0.802 Released!Hi folks - It's that time again when I release the latest round of features and bugfixes to SpecBAS :) New for this version are ZONEs which act ver…
... keyword which caused a stack overflow
Fixed a small annoying ...TAPlist - the emulator versionI've got this working reasonably well; there's just a couple of small extra features which I want to add. (Recall that TAPlist writes a formatted lis…
... the next text fragment would overflow the buffer the file as ...I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…
... too often (that buffer would overflow -- it is the programmer's ...16 Bit ADD versus ADCBesides the obvious difference that one adds without carry, and the other with carry, there is a startling difference in flag effects documented in Z…
... ]P/V is set if overflow; otherwise, it is reset.[/u ...CAPS-SHIFT KeyCodeIs there a standard Keycode for CAPS-SHIFT Key ? Looking at the ROM documentation in the Main key table KEYTABLE_A, there is no Entry for CAPS_SHI…
...
Eventually considering logic overflow to [b]KEYTABLE_B[/b] it ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... ADD A,$20 results in overflow, we're on the next ...SpecBAS 0.900 ReleasedAgainst my better judgement, here's 0.900. It's got lots and lots new, but mostly the new shiny is the editor. You can indent your code, you can e…
... TEXT could cause a stack overflow in some circumstances
INSERT ...SpecBAS 0.914 for Windows/Linux64/OSX Released!And here's another round of bug fixes - mostly for the OSX/Linux builds, but the windows build will also benefit. Windows/Linux: https://drive.go…
... scrolling to it.
Fixed overflow in syntax checker causing compiler ...
