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Canny use of the 'r' register?Seeing Sokurah's code in the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=583188#post583188"]crunch sound thread[/URL] has made me th…
BIT/RES/SET b,r where b is variableWhat's the best way to use the bit flag group of commands if it's not known in advance which bit should be referenced; ie. where it's dependent upon …
... (hl)" or a series of "cp n : jr cc,d";
* code ...IF and control flow in machine codeHi everyone, Basic has a nice control flow like if statements. How can these be done in machine code since i cant find anything thanks
... too.
Effectively what "CP n" does is, internally, take away ... the number n from the A register and ... are equal, A=n, so A-n=0, so Z ... A is less than n, A-n requires a carry operation ... A is greater than n, A-n gives a positive number ...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?
LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... position [b]mod[/b] [i]N[/i]" means either.
... at the coding position 'cp', then each of those ... a subsequent match on (cp+1), then each of ... those checked against (cp+2), and so on, ... matching (cp+n-1), plus the unmatched character at (cp+n), are ...Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... /> Just tonight I used a CP n to skip a XOR A ... A,3
DEFB 254 ; CP n
entry2 XOR A
Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... /> Just tonight I used a CP n to skip a XOR A ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... location
cp 64 ; all ... 00100000 ; 'N' or
cp 'n' ; 'n'?
...JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
It's always worth remembering that JP (HL) takes only 4 t-states to run, where as the usual JP nn takes 10. It's therefore very useful for coding jump tables where a succession of CP n/JP nn would take far longer to process.JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... tables where a succession of CP n/JP nn would take far ...JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... replaced a long list of CP n / JP Z,nn within Bomb ...JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... :
[CODE]
cp 0
jp z, COLLIDE_DONOTHING ...
cp 2
jp z, COLLIDE_FLOOR ...
jp z, COLLIDE_WALL
cp 6
jp z, COLLIDE_BOTTLE ... />
Each one of those cp n/jp nnnn pairs takes 17 ...Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …
... 't
[code]
CP n
JR NZ, next_cond2
handle_cond1 [...]
next_cond2 CP n2
JR NZ, next_cond3 ...
handle_cond3
next_cond3 CP n3
[/code]
z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... 255.
'cp n' subtracts the value 'n' from the value in ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... sees non-printable characters, only \n, \\, \', \" work properly ... tabledone
.notpressingcaps
cp 64
jr c, .noshift ... jp z, .handleCURLEFT
cp CURSOR_RIGHT
jp z, ... jp z, .handleCURUP
cp CURSOR_DOWN
jp z, ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... back a position
\n does a newline
... jp z, clr_pixels_homecursor
cp HOME
jp z, ... carriage_return_cursor
cp HORZ_TAB
jp z, ... horizontal_tab_pow2
.doneskipcheck
cp CR
jr z, . ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> jp z, carriage_return_cursor
cp HORZ_TAB
jp z, horizontal_tab_pow2 ... jr .errorcharliteralbadlength
.checkfordblquote
cp '"'
jr nz, .notquote
cp 'n'
jr z, .unescapewithD
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... 'p' is valid, '\n' is valid, '\j' is ... jp z, clr_pixels_homecursor
cp HOME
jp z, ... carriage_return_cursor
cp HORZ_TAB
jp z, ... #CE, #C6, #C6, #00 ; N
db #38, #6C, #C6 ... 66, #66, #66, #00 ; n
db #00, #00, #3C ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... jp z, clr_pixels_homecursor
cp HOME
jp z, ... carriage_return_cursor
cp HORZ_TAB
jp z, horizontal_tab_pow2 ... , #CE, #C6, #C6, #00 ; N
db #38, #6C, #C6 ... , #66, #66, #66, #00 ; n
db #00, #00, #3C ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... jp z, clr_pixels_homecursor
cp HOME
jp z, ... carriage_return_cursor
cp HORZ_TAB
jp z, ... /> jr z, .cantendwithsinglequote
cp '''' ; '
jr z, ... #0D = FORM_FEED+1
cp 'n'
jr z, .unescapewithC
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... jp z, clr_pixels_homecursor
cp HOME
jp z, ... carriage_return_cursor
cp HORZ_TAB
jp z, ... /> jr z, .cantendwithsinglequote
cp '''' ; '
jr z, ... #0D = FORM_FEED+1
cp 'n'
jr z, .unescapewithC
Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…
... trying to put Ghosts n' Goblins onto a +3 ... LD C, A
65062: CP A
65063 ... A, 198
65092: CP B
65093: JR ... A, B
65106: CP 212
65108: JR ... C, A
65303: CP A
65304: CALL ... /time hack
65432: CP 2
65434: JP ...Quiz V - the revenge of D`n`C Ok, 50 quick fire questions.. some cryptic - you`ll have un unravel the clues to get the game name, while others are description of the game. Ther…
Ok, 50 quick fire questions.. some cryptic - you`ll have un unravel the clues to get the game name, while others are description of the game.
There are 63 points available this time.
You can either email your completed answers (along ...Frank'n'stein - Help !!!Hi! Did ANYONE of you EVER complete Level 25 of the platform game Frank'n'stein? I think its impossible... But as the Crash Magazine review mentions…
Hi!
Did ANYONE of you EVER complete
Level 25 of the platform game Frank'n'stein?
I think its impossible...
But as the Crash Magazine review mentions 50 levels...P'n'P Site NewsPeek 'n' Poke October 2002 Latest site news If you like this site, then why not head over to Peek 'n'Poke? It covers Atari 2600, Spectrum, C64 and …
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n'Poke?
It covers ... forum, join us at Peek'n'Poke
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LeeT
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Load'n'Run per gli Spectrumisti Italiani.Se non sbaglio stavate cercando o provando a ridurre in file adeguati i vecchi nastri di Load'n'Run ecc., ma , tirate un sospiro di sollievo, qualcun…
... i vecchi nastri di Load'n'Run ecc., ma , tirate un ...The Your Sinclair Rock'n'Roll Years TV ShowComing soon... by the end of 2003... Way back in 1997, I put together the Your Sinclair Rock'n'Roll Years. The idea was a simple one, inspired by th…
... together the Your Sinclair Rock'n'Roll Years. The idea was ... by the BBC's Rock'n'Roll Years TV series. The ... />
The Your Sinclair Rock'n'Roll Years took that idea ... for The Your Sinclair Rock'n'Roll Years TV show!
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 …
... .
When performing a CP instruction, is the P flag ... />
LD A,3
CP 3
JR P,9999 ...
