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How to return to basic properly from ASMI am messing around with a fast stack copying routine. But I am getting "A: Invalid argument" error when I later return to basic. I know you h…
... with a fast stack copying routine.
But I am getting ... the shadow registers) before calling my test routine I do not see the ... -
Calling ROM routinesFirstly, sorry if this is the wrong forum to post this in, but I wasn?t quite sure under which heading is best fitted. I?m trying to figure out how…
... be the ascii code - the routine decodes the variables' names as ... set the syntax bit before calling the routine (Bit 7 of FLAGS ... trying to find your variable. Test carry to see if it ... -
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 …
... 0x0000 due to its memory test routine. So you have to do ... the initialization of BASIC (by calling all the functions that normally ... -
Is bank 7 usable at all?Can you assemble stuff and page bank 7 in and out? I've encountered nothing but problems so far, where does it page to? 49152?
... , and easiest on a PC, test in an emulator, then only ... BASIC, not calling any routine (or at least any routine that could use ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... printloop.symbol
TEST:
org 30000 ... equ 0x1601 ; ROM openchannel routine
ld hl,str2 ... to the string before calling this routine
fetchan ... NEXT SPACE
; CHECK routine TONI BAKER ,
... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
[code]
TEST:
org 30000 ; ... equ 0x1601 ; ROM openchannel routine
ld hl,str2 ... to the string before calling this routine
fetchan ... NEXT SPACE
; CHECK routine TONI BAKER ,
... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... s programmed to.
[code]TEST:
org ... equ 0x1601 ; ROM openchannel routine
ld hl,str2 ... to the string before calling this routine
fetchan ld ... NEXT SPACE
; CHECK routine TONI BAKER ,
... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
[code]
TEST:
org 30000 ; ... equ 0x1601 ; ROM openchannel routine
ld hl,str2 ... to the string before calling this routine
fetchan ... NEXT SPACE
; CHECK routine TONI BAKER ,
... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
[code]
TEST:
org 30000 ; ... equ 0x1601 ; ROM openchannel routine
ld hl,str2 ... to the string before calling this routine
fetchan ... NEXT SPACE
; CHECK routine TONI BAKER ,
... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
[code]
TEST:
UDGSTART EQU #5C7B
routine
ld hl,str2< ... to the string before calling this routine
fetchan ld ... NEXT SPACE
; CHECK routine TONI BAKER ,
jr ... -
ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …
... most efficient way of calling a routine in ROM-1 from ... so that when the routine in ROM-1 executes ... control is returned to the routine that called it?
... with the address of the routine in ROM-1, which ... RAM part of the paging routine should live at 23296, ... -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... FILL routine). Because the second DEC (HL) instruction of this test ... logic analyser showed the memory test successfully went a good ... to capture the RAM-FILL routine passing from lower RAM ... written a little machine language test routine and perhaps that would ... -
saving time populating large arraysI use a variation on this idea for storing machine code at the end of programs without interfering with LIST, then it occurred to me that it would al…
... the program every time, this routine enables it to be populated ... program (or else by calling the routine as a direct command) it ... .
Here's the routine. It just uses a small ... -
A Miscellany of Dangerous TipsHere's a selection of ideas for using some of the more obscure system variables which I've found handy on occasion. They can be very convenient if us…
... for reference within the sub-routine by assigning DEFADD appropriately ... to know if the sub-routine is to do different ... an error check in each calling sub-routine.
Examples ... /> * General purpose full screen input routine (May)
* saving time ... -
Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…
... call the DOS SET 1346 routine. The problem is that I ... from, except that simply calling the routine with RANDOMIZE USR 319 won ... -
Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... Ritman's random number routine, published in Your Sinclair ... Head Over Heels. The routine is quite fast and returns ... two DPs (0). The test routine, or a GO SUB ... VARS areas, this small routine can be merged into ... +INT (RND*50): REM test routine here
9995 NEXT ... -
problem with symbol shift and caps shift key combinations on multilayer keyboard membranesHello, I know, it is generally know that some ZX Spectrums with multilayer keyboard membranes have problems with some key combinations. Typically …
... problems. I rewrote keyboard reading routine by using part of someone ... i write very simple relocable test routine https://cygnus.speccy.cz/tmp ... -
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... last point, instead of calling the routine to calculate the new line ... these optimisations should give the routine a fair old boost.
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... last point, instead of calling the routine to calculate the new line ...NEW CRONOSOFT RELEASESHi all, A few things happening at the moment, which may be of interest ... PLATFORM GAME DESIGNER ----------------------- A surprise this one... …
... returns to BASIC (or the calling MC routine) at the end of ...128K memory testingDuring a mad half hour I decided to write a little memory tester program in BASIC using the information from the 48K service manual. Now I was wonder…
... /> You can read the ROM test routine here.
[url]http ...Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…
... =Alcoholics Anonymous]Call the keyscan routine directly at $02bf as in ... now I wonder if your calling the routine directly and the fact ...Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... back in, 4) returns to calling routine. Such a solution is both ... address to call and then calling a routine inside the stack space ... - basically, the stack based routine is being called but failing ... BASIC ROM in and then calling the predetermined BASIC ROM ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... included or you will be calling the routine differently, just adjust d1 ...Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... tedious and largely pointless memory test sequence performed by PC BIOS ... economically than the actual ROM routine. I'm sure the guy ... . The Spectrum routine as it stands does a rudimentary test which will ... out just fine in a test routine, but bits are found to ...Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... out just fine in a test routine, but bits are found to ...Cross Platform DevelopmentWhat's the best way to develop cross platform apps? By best, the only limiting criteria would be "at no cost" :)
... as flashing attributes and a test routine) - with no optimisation, is less ...Cross Platform DevelopmentWhat's the best way to develop cross platform apps? By best, the only limiting criteria would be "at no cost" :)
... as flashing attributes and a test routine) - with no optimisation, is less ... fear is that the library routine may be implemented in C ...
