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Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
We all know that stack pointer cheese and push/pop ... -
SpecBAS 0.646 now available.Yay! Here's another round of bugfixes and additions to the Program. Not so much of the extract coding features, but more back-to-basics this time: […
... range of lines, with GOTO/GOSUB fixing for absolute values.
GOSUB from a direct command didn ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... until the CPU meets the stack, and then it interprets the ... instructions.
But AFAIK, the stack contains the same values after ... -
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…
... due to stack overflow as the machine stack eventually gets ... (less serious) cases of stack overflow can all be fixed ... by simply resetting the stack pointer at the end ... 195 121 196
; reset stack pointer at end of level ... -
CrusoePlease add the following "known errors" description for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0002872"]Crusoe[/URL]: [QUOTE]Bu…
... significant error was the machine stack overflow, caused by indirect recursive ... saved game messed up the stack and the QQQ/TIUQ option ... that was due to the stack being messed up by other ... -
(part of) screen to UDGHere is a routine to copy a Y,X-position on screen to a UDG. 0<=y<=23 0<=x<=31 144<=udg<=165 (UDG "A" to UDG "U") [code] ; start code with ; PRINT …
Here is a routine to copy a Y,X-position on screen to a UDG.
0 -
Xecutor (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0005783"]Xecutor[/URL], please add the following "known errors" desc…
... Alkatraz protection incorrectly points the Stack Pointer to a data table ... -
How to check .txt files for corruption?I rescued some ebooks (all in .txt format) from a dying SD card, but it turns out that some of them are corrupt - they start OK but part way through …
... them, but there's a stack of these files, and rather ... -
SpecBAS 0.690 Now AvailableHi folks - 0.690 is now available at the usual location: [url]https://sites.google.com/site/pauldunn/SpecOS.zip[/url] You can also download the rece…
... /> RENUMBER didn't renumber GOTO/GOSUB that had a statement following ... -
Which emulator......would people recommend? I'm currently just pottering about with the demo version of Speculator but notice some games stack on it, are there any b…
... Speculator but notice some games stack on it, are there any ... -
automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …
... puts its address on the stack and so SP could be ... /> PUT_SP: ld (STACKP),sp ;save stack pointer
ld hl,CHANGE ... /> GET_SP: ld sp,(STACKP) ;restore stack pointer
ret
Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…
... HL, 32800 ;LOAD HL WITH STACK POINT LOCATION
LD SP ... , HL ;SET STACK POINTER TO HL
LD ...IDE Hard Drive on your Spectrum!Hello there my fellow WoS'ers Today, I am going to share with you something that has truly captivated me over the last couple of months, some of you…
... chasis... so how does this stack up in one of those ...Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... />
ld (32859),sp ; Preserve stack pointer
ld sp ...saving part of a BASIC programHere's a short routine to save part of a BASIC program. The idea is that it can be merged into a program and then used to save sub-routines, etc. to …
Here's a short routine to save part of a BASIC program. The idea is that it can be merged into a program and then used to save sub-routines, etc. to be combined or merged into other programs. It's sort of a slow version of copy & paste. The two line ...Sandbox games (Speccy and non-Speccy)A subject that came up today was what does the term 'sandbox' game mean? I'd originally thought that a sandbox game was one where you built thing up …
... , as they allow you to stack things up if you so ...AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
... [code]
EX1NUM: equ $1c82 ;stack one numeric expression
STAKA ... over ,
call EX1NUM ;stack 1st variable
pop af ... over ,
call EX1NUM ;stack 2nd variable
call FPTOBC ...probably a stupid question about RST16I'm using the 'hello world' code borrowed from [url=http://equant-retrochallenge.blogspot.com/2008/07/zx-spectrum-assembly-programming-under.html]her…
... 't buggered around with the stack pointer or anything like that ...divide question - ribbon cable?Hi - recently got a divide and loving it but not enough room on my desk. Is anyone aware of a supplier of a ribbon cable that could sit between +3 …
... space by allowing me to stack divide on top of disc ...Guide 2: Resurrect dead microdrive cartridges!Hi again, I've just made another little guide: [url]http://www.mutant-caterpillar.co.uk/guides/Resurrect_Microdrive/[/url] If, like me, you have a…
... , like me, you have a stack of microdrives, you'll know ...More for SaleSingle cases from R-S (missed them out before, silly me!) Box 18 R-S Single Cases Rogue ? Mastertronic Rollaround ? Mastertronic Roller Coaster ? E…
...
Sports Hero ? Firebird
Stack Up ? Zeppelin Games
Star ...Some questions for us big-brains to ponder...1) In this week's Micro Mart (well, tomorrow it will be last weeks, but I only got around to reading it today) it says that it's untrue that PC compo…
... not have the ability to stack bulk copy/move tasks from ...Procrustean PrintingHere's a short routine to manage printing of text with command tokens, to avoid messing up the screen when they are expanded. It just prints as many …
... FETCHS: equ $2bf1 ;from calculator stack: AEDCB
FPTOBC: equ $ ... 2dd5 ;from calculator stack: A
;stack function parameters passed from ...
;PRINT USR stack,string_expression,max_length,substr;
;expand ...Invalid combination of operands and opcodesIt says the error in the title, why is this?? [CODE] ORG 0000 LD HL, 63000 ;LOAD HL WITH STACK LOCATION LD SP, HL ;SET STACK POINTER TO HL LD A, …
... HL, 63000 ;LOAD HL WITH STACK LOCATION
LD SP, HL ... ;SET STACK POINTER TO HL
LD ...Indirect Variable AssignmentHere's another wacky routine. This allows assignment of values to variables where the source & destination variables can themselves be defined in var…
... the value on the calculator stack and point CH_ADD to the ... /> FETCHS: equ $2bf1 ;from calculator stack: AEDCB
CH_ADD: equ 23645 ...Undefine functionHere's a routine to selectively remove variables from the VARS area and reclaim the space. This can be done partially from BASIC already by assigning…
... was fetched off the calc.stack, as the command line would ...
FETCHS: equ $2bf1 ;calculator stack to AEDCB
E_LINE: equ ... /> CH_ADD: equ 23645
;stack function parameters passed from BASIC ...A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
... /> #pragma output STACKPTR=53248 // place stack at $d000 at startup
Just a thought (something I wish modern games would do)The great site cracked.com (a brilliant way to waste time is to start on one of their pages, and the next thing you know you've spent three hours rea…
... browser, and there's a stack more you want to click ...Help needed with a loop counterVariable W counts to 12 then calls a subroutine to move a character, it then resets to zero and starts again. For every 2 moves of that character I …
... +1: IF W=12 THEN GOSUB 3000 (Where it moves the ...
