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SUB and the S flagGuys, if I use SUB to take a value HIGHER than is currently in A, does the S flag get set? I know that N does. [code] LD H,33d LD A,32d SUB H …
... in A, does the S flag get set? I know that ... -
Chequered Flag needs a remake!I don't know about the rest of you guys but I always thought Chequered Flag was great. There was speed and challenge of trying to master the cars an…
... but I always thought Chequered Flag was great. There was speed ... -
IRATA.ONLINE celebrates its 400th sign-on, today!IRATA.ONLINE just celebrated its 400th sign-on today. It has been on-line for approximately 9 months, and I am extremely surprised at how many pe…
... .ONLINE just celebrated its 400th sign-on today.
It ... website http://www.irata.online/ sign up, and grab a terminal ... -
Currah uSpeech ROM Paging and BootyHi, When I emulated the Currah uSpeech for [url="http://www.inkland.org.uk/inkspector"]InkSpector2[/url], I made it page in its own ROM on memory …
... as this particular condition (positive / sign clear) just happens to be ... , the condition po (P/V flag reset) is true on the ... -
Question about CP Z80 instructionSorry if this is the wrong folder, but it seems the most appropriate. When performing a CP instruction, is the P flag set when the compared values …
PV flag means parity/overflow. Generally in ... a number with the incorrect sign. For example 127 + 2 = 129 ... complement 129 is -2, the sign is wrong and hence there ... -3 = 0 is the correct sign the routine should not jump ... -
I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... /> With regards to the overflow flag - would it be set everytime ... causes the result to change sign.
Consider the following ... that use the parity/overflow flag to indicate it.
A bit late, but 10 years of PlayStaion! My thoughts.I think the acual Aniversary of the Playstion release was a couple of weeks ago, but I picked up GamesTM today and it has a big feature about it (bes…
... the online battles. Capture the Flag type online games are brilliant ... Halflife II. Perhaps its a sign of me getting older and ... also i think its a sign that there just arent as ...ADCI'm a little confused about how the Z80 manages the ADC instruction. I'm assuming two ADD instructions are performed (am I wrong?!) I can think of 3 …
... Overflow flag set?
If overflow is detected by checking the sign ... added to Operand and that sign bit used or is it ...ADCI'm a little confused about how the Z80 manages the ADC instruction. I'm assuming two ADD instructions are performed (am I wrong?!) I can think of 3 …
... /B7) is the carry flag. If Cin for the ... flag set?
If overflow is detected by checking the sign ... to Operand and that sign bit used or is ... ):(0)))!=s)
set overflow flag;
[/code]
flag and OR that with carry ...Cronosoft gets it's first FATWA issued against it.I've just heard from Andy from the Crap Games Competition, that our crap game 'MANIC MUSLIM' has received a complaint. Here's the complaint... [qu…
... bogs, there was a big sign stating the effect of...
flag symbolising someone's country?
Cronosoft gets it's first FATWA issued against it.I've just heard from Andy from the Crap Games Competition, that our crap game 'MANIC MUSLIM' has received a complaint. Here's the complaint... [qu…
... bogs, there was a big sign stating the effect of...
flag symbolising someone's country?
DivIDE interface help neededhave got my DivIDE interface, CF adapter and CF 1 gig card all linked up, on a +3 I get the DemFir intro screen, good! Problem is I get no screen wha…
... emulates registers IX, DE, Carry flag and even block checksum. You ... returns tape loading error - a sign that TAP file might be ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... AA
// \x01 set center flag
// \x02 set right justify ... flag
// special chars must be ... mean. Then add a plus sign (for example) to the end ...soviet roofsthe instructions to soviet state: "Reconocer?s los edificios donde se encuentren los rehenes observando las azoteas." ("You will recognize the bu…
... top of the roofs the sign of the former ussr in ... color, the one in its flag (i dont know the words ...soviet roofsthe instructions to soviet state: "Reconocer?s los edificios donde se encuentren los rehenes observando las azoteas." ("You will recognize the bu…
... top of the roofs the sign of the former ussr in ... color, the one in its flag (i dont know the words ...Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... /> You will need Instead a flag f to indicate if the ... /> [QUOTE=Digital Prawn;211722]Negative sign indicates selling 'q' items, rather ...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…
... overflow flag is the XOR of the carry coming into the sign ... carry going out of the sign bit (if any).
sign bit easily (it's the carry flag right?) but ...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…
...
// Work out the sign bit of arg1 and right ... />
// Work out the sign bit of arg2, right shift ...
// Finally work out the sign bit of result, right shift ... am setting the PV flag when I shouldn't, ... routine) 0x9A it's sign bit is set so ...Cis this a valid instruction? [code] A + B; [/code] If I assign 3 to A and 2 to B; and then "A + B;", then A should equal 5, and B equal 2. Correct?
... :
If the [b]sign[/b] (SGN) of the two ... -bit registers but the carry flag gives you an easy way ...Is this happening more now..?[URL="http://cgi.ebay.co.uk/Jet-Set-Willy-ZX-Spectrum-Signed-Matthew-Smith-/200564808970?pt=UK_VintageComputing_RL&hash=item2eb2981d0a"]eBay link[/UR…
... him to sign about 20 ;)
same with chequered flag / scrabble :lol ... couldn't.. i wouldn't sign it :p
I ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... also copied to the carry flag), and nothing else if ... "normal" rotation, where the carry flag act as the extra bit ... two's complement, so the sign bit (7) is extended ... also keeps its value (the sign must be kept). In ... by 2 (and if the sign bit happens to change, ...MEMPTR: Is it worth emulating?Some advice if you will :) The only info I have on MEMPTR is this document here: [url]http://zx.pk.ru/showpost.php?p=43800[/url] I notice SpecEmu h…
... Sabre Wulf do exploit undocumented flag behaviour, but only the behaviour ... BIT 7,x setting the sign bit which is undocumented in ...2nd OpCode question.... pretty please...Whats 0xED 0x70 please? Sean's doc says: IN F,(C)* / IN (C)* That doesn't mean much to me :( Lower down in Sean's doc it says: ED 70 is IN F,(n) so…
... A,(n) but with the flag register?
Is (C ... BC is read, and the Flag register is set accordingly (so ... Zero flag is set if the value read is zero, and Sign ...2nd OpCode question.... pretty please...Whats 0xED 0x70 please? Sean's doc says: IN F,(C)* / IN (C)* That doesn't mean much to me :( Lower down in Sean's doc it says: ED 70 is IN F,(n) so…
... BC is read, and the Flag register is set accordingly (so ... Zero flag is set if the value read is zero, and Sign ...Chequered Flag vs Pole Position[CENTER][IMG]http://www.worldofspectrum.org/showscreen.cgi?screen=screens/in-game/c/ChequeredFlag.gif[/IMG][IMG]http://www.worldofspectrum.org/showsc…
... I'll go with Chequered Flag, though I'm surprised the ... see another car or road sign lurching jerkily towards you, and ... get a bit sluggish. Chequered Flag isn't as colourful but ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... no [B]P/M[/B] flag. Both [B]JP M[/B ... on the [B]S[/B] flag:
[LIST]
[*] [B]JP ... "jump if minus sign", i.e. "jump if flag S is set ... "jump if plus sign", i.e. "jump if flag S is reset ...olympic torches for sale?just had a look on ebay.. in 2 minds about it.. people offering a poultry amount to charity as some come back is rather weak.. 10%.. so what.. (no d…
... a chequered flag.. I should really get DT to sign one of ...olympic torches for sale?just had a look on ebay.. in 2 minds about it.. people offering a poultry amount to charity as some come back is rather weak.. 10%.. so what.. (no d…
... a chequered flag.. I should really get DT to sign one of ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... -9A-F
;
; z flag set indicates '0' digit
ld (de),a ; write negative sign
inc de
flag state (for m/c callers ... (zero or minus) and associated flag. However a lot of the ...
