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FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... address in DEF FN ***
CP $29 ; is character a ')' ?
ROM. Now I'm pretty sure that a ... -
tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…
... the screen either). I'm afraid that it's rather ... plus I use the 48k ROM address for STMT_RET, not the ... LD SP, HL ; 249 ;from m/c stack
INC HL ... LD A, (HL) ; 126
CP 62 ; 254 62
JR ... -
Auto generated spritesLooking around for some graphics I came across [url]http://blog.disktree.net/?p=19[/url] , one of several such pages. Need the odd 8x8 UDG or two (…
... miles away from something I'm working on at the ... together and poke into the rom default udg area. It' ... ,2 ;quick routine so using ROM, upper screen
call ... /> loop ld a,b
cp 80 ;=10 udgs, 80 key ... /> ld a,22 ;using ROM to display no of key ... -
Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
I'm on fire tonight!
... ,0 ;point hl somewhere in ROM
ld b,6 ;using ... 48k ROM you need 5 or more ... file
inc hl ;and ROM
ld a,d ;are ... and into attributes yet?
cp 88
ret z ;yep ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... /> AAAA
Also, I'm chuffed (& suprised) to see ... dumps 16 columns of background (rom in this case) and masks ... /> delay in a,(255)
cp 255
jr z,delay ... d
and 7
cp 7
ret nz
FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... right now so I'm not really sure ... call FN error in ZX ROM.
;(c)2011 ... ld a,(hl)
cp ')'
jr z,EndDEFFN ...
cp 0eh ;Found hidden mark
Switching 48/128 modes within a BASIC programI'm not sure what use this would be; ie. being able to switch between 48k and 128k modes and back again from within a continuously running BASIC prog…
... al. for the various ROM disassemblies which were invaluable in ... 2010 INPUT "Switch/Quit ";m$: IF m$="s" THEN RANDOMIZE USR ... 9000 PRINT "Report code ";FN m(PEEK 23681);" at line "; ... MODESW: ld a,(75)
cp 191
ret z ; ...Switching 48/128 modes within a BASIC programI'm not sure what use this would be; ie. being able to switch between 48k and 128k modes and back again from within a continuously running BASIC prog…
... ;STMT-RET (+2A/+3/+3e ROM.1)
push hl
MODESW: ld a,(75)
cp 191
ret z ;16k ... ;address of $FF in BASIC ROM, for report "0 OK"
[I]PS: I'm just not sure about replacing ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... br />
Hi folks, I'm a machine code novice who ... number and use the instruction cp (= compare) to see if ... -
Choose a location in ROM where the are 256 random ... ;source of random bytes in ROM
ld d,0< ... ;source of random bytes in ROM
ld d,0< ...Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …
... it. Anyway, what I'm getting now (every time I ... call $1601 ; ... and call the ROM routine to activate it
cp $FF ; is it FF?
m starting to think it might ... starts to hurt - I'm not yet at a level ...Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…
... the obligatory "hello world" program, cp, ls, sleep, uptime, sh and ... , but retaining compatibility with the ROM code. Then I want to ... interrupt, before stack switching, I'm keen to keep this as ...Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…
... - the actual Microdriver. [b]I'm[/b] not going to do ... 's at 0100h in mirage.rom:
[code]
xor a ... ; SNA header at 2299h, I'm guessing.
pop af
cp 1
jr z,X012A ...Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…
... 's at 0100h in mirage.rom:
[code]
xor a ... ; SNA header at 2299h, I'm guessing.
pop af
cp 1
jr z,X012A ...Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…
... to 9999, as using the ROM routines was too slow. They ... /> PADLOOP:ld a,(hl)
cp " "
jr z,PADPAD
m=1 TO I
ld ...
dec a ; 1155 NEXT m: LET I=I+I2
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... starting value
cp .pilot_pulse_min+.edge_loop_start_pilot
... starting value
cp .zero_pulse_min+.edge_loop_start_pilot
... to plan. I'm not claiming that ... jp z,0x1b7b ; ROM routine indicating BREAK (code ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... and coloured borders. I'm particularly pleased with the new ... the loop starting value
cp .pilot_pulse_min+.edge_loop_start_pilot
jr ... /> ;; same colour scheme as the ROM loader
macro ...128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…
... -coded.
I'm just using the standard tape ... =233 +2A/+3/+3e
cp 233
jr nz,MCCONT ... STMT-RET (+2A/+3/+3e ROM.1)
push hl
MCCONT: push hl ;stack ROM return address
LD A ...Mercenary 1+2 CompendiumDear all users of +3 disks, I am an eager fan of Mercenary game, in which I made a good deal of progress years ago. I was looking for some standart …
... disk. Mercenary don't use ROM routines to save/load, so ... had a version that use ROM routines, patching it to save ... of help:
[PHP];* * * M E R C E N ... )
ld a,(19039)
cp d
;no- load another ...PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…
... 48K BASIC.
When I'm in the 128K menu or ...
Now the PlusD ROM disassembly says this:
[CODE ... LD A,(#3DE5)
0056 CP #47 Check if returning from ... NMI_1[/CODE]
I'm wondering here wat that CALBAS ...FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... -if1-rx[/B] (or [B]cp[/B]) I receive a screen ... -wide FIFO, and apparently the ROM won't notice the difference ... wide FIFO. I imagine the ROM might get back in sync ... that aren't, although I'm not sure what it would ... 1 and what the IF1 ROM sends must match this for ...analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …
... able to patch the ROM. It's only ... program below. I'm using it to determine ... c,a ;*[/color]
cp " "
jp z,GetNextLetter ... c ;if A="{"
cp "a"
ret nc ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... rather than always using the ROM set.
* Address the display ... the SmallINT check, as the ROM FP_TO_A routine does it anyway ... checking.
(This time I'm trying to set the listing ...Memory questionsQuestion 1: PRINT PEEK 23732+256*PEEK 23733 returns 65535 for a 48K Spectrum and 32767 for a 16K Spectrum. PRINT PEEK 16388+256*PEEK 16389 return…
... . However, since the BASIC ROM sets the stack pointer to ... /> JR NC,rampack16k
CP $0B
JR NC,rampack3k ...
CP $07
JR NC,rampack2k ... a week ago. I'm now about 0.1% ... text adventure, if I'm really determined to land myself ...Database model ZXDBRecently, I have been trying to figure out how to provide my contribution to whoever takes over WoS archive rework next... So I came up with this: …
... .img
/pub/sinclair/games/m/ModernTalking.z80.zip ModernTalking.tap ... .tap
/pub/sinclair/games/m/Meteor_2.z80.zip a-meteor ... /utils/CP-M2.2ForTheLECMemoryExtension.tzx.zip LEC Memory Extension Rom v2.4.rom ...Database model ZXDBRecently, I have been trying to figure out how to provide my contribution to whoever takes over WoS archive rework next... So I came up with this: …
... .img
/pub/sinclair/games/m/ModernTalking.z80.zip ModernTalking.tap ... .tap
/pub/sinclair/games/m/Meteor_2.z80.zip a-meteor ... /utils/CP-M2.2ForTheLECMemoryExtension.tzx.zip LEC Memory Extension Rom v2.4.rom ...Can't Get My Simple Code To RunHello again, I'm trying to run the following simple code: [code] org 32768 main ld b, 21 ; x coordinate is …
... />
setchan equ 0x1601 ; ROM openchannel routine
cr equ ... /> ld a,(hl)
cp 0xFF
ret z ; this ... for me as i'm still getting a grey ... to see what I'm doing. I would post ...
