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InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... where you could put a JP to your 'real' interrupt routine ... the value in the NMIADD system variable (23728) if it was non ... -
I forgot which system variable I need...... to prevent the message 'start tape, then press any key'. I saw the system variables list but it's not helping. I know I used one poke to bypass t…
... to prevent the message 'start tape, then press any key'. I saw the system variables list but it's not helping. I know I used one poke to bypass the messagem but I can't find it. :( -
A tidy loader for minigamesThe minigame competition doesn't permit the use of separate loaders like [code]10 LOAD "": RAND USR 32768[/code] The loader must be included in the b…
... uses two variables: a string variable contains all the machine code ... example)
1018 65 Variable name (a)
1019 0 ... INK exx *
218 PAPER jp c, NN ** *
219 ... -
A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…
... store in (COORDS) system variable. This is rather slow ... />
__DRAW_ERROR:
jp __OUT_OF_SCREEN_ERR
DRAW ... ; and (hl)
jp __DRAW_START
__DRAW_SETUP1 ... in free E register
jp __DRAW4_LOOP
... -
[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... the selected color to the system variable 'BORDCR'.
out ... the previous row.
jp nz,cls_attributes_loop ; Keep looping ... the previous row.
jp nz,cls_screen_loop ; Keep ... /> ;ret
infinity:
jp infinity ; Avoid going back to ... -
MC 101Hello Group Members: Can't spectrum MC be embedded in a BASIC program
... for that by PEEKing the system variable PROG and add on offset ... the code itself (eg no "JP nn" instructions because "nn" will ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... where you could put a JP to your 'real' interrupt routine ... the value in the NMIADD system variable (23728) if it was non ... -
IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …
... turns out Jetpac uses the system variable CHARS. All we have to ... 32769).
[CODE]8001 JP $3200[/CODE]
This ... in IM 0
B231 JP $6000 ;start the game![/CODE ... -
48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... code routines as well as system variables. Changing the paging routines ... setting bit 4 of FLAGS (system variable at address $5C3B) will cause ... replacement tool (like "The Ghost" JP talked about earlier)
Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
JP:
On a Spectrum, ... below RAMTOP. This 16-bit system variable (at 23730) contains the value ...Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
[QUOTE=Marko;346104]JP:
On a Spectrum, ... below RAMTOP. This 16-bit system variable (at 23730) contains the value ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... br /> ld hl, chars ; address system variable
ld (hl), 0x00 ; ... ; 04t => 022t
jp nz,interrupt_delay_loop ; 10t => 032t ... still works in BASIC)
jp 56
; ... routine
org 0xfff4
jp interrupt_main
; cache ...Ultimate! Time WasterThis used to bug me big time 25 years ago.:mad: In the early 16k releases of Ultimate Play the Game , Games Jetpac Cookie Trans am there are three …
... BC, $2000
LDIR
JP $61E5
[/code]
... is the location of the system variable NMIADD (famously known to ... spectrum ROM).
[code]
JP (HL)
[/code]
... the location of the system variable MEMBOT which stores the ...Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …
... /> Where 'n' is any numeric variable, and 'v' any numeric expression ...Jumping to BASIC after importing 23296,1703Sorry for the confusing title. :-D Now that I've learned how to stop a game from starting after loading (in Fuse and Specemu), I have a few more que…
... set the stack and ERR_SP system variable before jumping to the BASIC ... ), sp ; errors return here
jp 7030 ; address of STMT-RET ...Detecting ZX Interface 1 ROM VersionIs there any way of checking which version of the ZX Interface 1 is present? I know that the later ROMs were better at networking - what other impro…
... TABs when printing (uses unused system variable 23728 )
4) uses up ... !
I'm sure jp will give a definitive answer ...+2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …
... 31 ff 62 $0ats
jp $6300 ; 5b29 c3 00 63 ... 31 fc 62 $0ats
jp $6300 ; f3b0 c3 00 63 ... $7FFD
; into new system variable BANK_M ($5B5C).[/CODE]
And manipulating the FLAGS system variable - again description by Paul Farrow ...SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... br /> ; so look at the system variable PROG
dec hl ; move ... ; leap back to the operating system.
push af ;
...
sub 165 ;+
jp 0x0c10 ;+ exit via PO_TOKENS
cp 169 ; printed.
jp nc, err5 ;
call fitcq ...Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
...
; so look at the system variable PROG
dec hl ; move ... the
push af ; operating system.
call doit1 ;
pop ... is
sub 165 ;
jp 0x0c10 ; exit via PO_TOKENS
Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... /> ld (23693),a ;screen colour system variable
call 3503 ;ROM routine ... ,(score)
call 6683
jp GameLoop
score DEFW 9999 ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
ld hl, (0x5c53) ; store system variable PROG in HL
dec ... /> ld de, (0x5c4f) ; store system variable CHANS in DE
sbc ... value by decrementing it
jp m, CHK_AT ; expecting a ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
ld hl, (0x5c53) ; store system variable PROG in HL
dec ... /> ld de, (0x5c4f) ; store system variable CHANS in DE
sbc ... value by decrementing it
jp m, CHK_AT ; expecting a ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
ld hl, (0x5c53) ; store system variable PROG in HL
dec ... /> ld hl, (0x5c4f) ; store system variable CHANS in HL
ex ... value by decrementing it
jp m, CHK_AT ; expecting a ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
ld hl, (0x5c53) ; store system variable PROG in HL
dec ... /> ld hl, (0x5c4f) ; store system variable CHANS in HL
ex ... value by decrementing it
jp m, CHK_AT ; expecting a ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
ld hl, (0x5c53) ; store system variable PROG in HL
dec ... /> ld hl, (0x5c4f) ; store system variable CHANS in HL
ex ... value by decrementing it
jp m, CHK_AT ; expecting a ...
