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why cant i get the +2a / +3 self test program to work on an emulator?ive tried 2 different emulators. i can get to the test pattern but thats all. holding the keys does nothing
I can't find it but I'm 90% sure there was a topic here explaining the above (key mapping) and also a way around it by simply changing the PC address in the emulation window to be the 'test' routine start hence it would accept the keypresses. -
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. …
... the occasions when it did start correctly, I examined the contents ... how the ROM's start-up memory test works. The relevant ... RAM test was regularly finding a problem at the start of ... written a little machine language test routine and perhaps that would have ... -
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 ... two DPs (0). The test routine, or a GO SUB to ... VARS areas, this small routine can be merged into ... +INT (RND*50): REM test routine here
9995 NEXT ... PRINT #0;AT 0,0;"Start =";st: BORDER 2: RETURN< ... -
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 …
... you start it from address 0x0000 due to its memory test routine. So ... peripheral ROM would have to start executing at the next instruction ... harder - letting the main ROM start and get its initialization out ... -
Test program for 128k machinesThere is a Test Program for 16/48k machines: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0008884&loadpics=3[/url] Is there a similar progr…
... has a dire ROM test routine.
I posted ... Research included a ROM test routine on their 'Test Program' (1985, Dr ... :
LD HL,$0000 ; start of ROM
LD BC ... /> [/code]
The routine return with zero set for ... -
Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... 't detected by the RAM test routine that is executed at startup ... device to test the RAM in-place, I'd start by removing ... -
BIN2BAS (load BASIC text into emulator) utilityI've nearly finished testing this. It allows a BASIC program to be loaded from a text file in any emulator which has a "load binary" option. I was wo…
... "Room for BC Bytes?" routine at ROM0:$3F66 fails with ... 20 or just below the start of the text, whichever ... about 14kb of the 25kb test file, but stopped at ... write a separate insert/test routine so that I can ... the ROM0 & ROM1 "test room" routines will fail on ... -
Problem With POINT StatementHello everyone this is my first ever post, So firstly i'd like to say hello to everyone and secondly thank you to the admins for such a great site, …
... used routines right at the start - since when you tell BASIC ... line it starts at the start of the program and scans ... , as part of a bug test routine. (If it changes a lot ... -
Writing faster BASICIn terms of structuring BASIC programs, what are the best ways allocate variables, functions, arrays? Any tips. I remember INPUT mag had some suggest…
... GOSUBs, are placed near the start of the program.
routine rather than a DEF FN ... be as close to the start of a line as possible ... be as close to the start of the program as possible ... =t0: PRINT AT 4,0;"Start : ";st:
GO SUB 3 ... -
Writing faster BASICIn terms of structuring BASIC programs, what are the best ways allocate variables, functions, arrays? Any tips. I remember INPUT mag had some suggest…
... is slower (in a *1000 test loop the times are 21 ... DIM a$(1) then the test loop takes 33").
test routine, declaring them at the end ... the variables rather than the start increased the loop time from ... -
Writing faster BASICIn terms of structuring BASIC programs, what are the best ways allocate variables, functions, arrays? Any tips. I remember INPUT mag had some suggest…
... is slower (in a *1000 test loop the times are 21 ... DIM a$(1) then the test loop takes 33").
test routine, declaring them at the end ... the variables rather than the start increased the loop time from ... -
Bomb Munchies - preview releaseBomb Munchies Preview release Version 12th Jan 2014 [URL=http://s979.photobucket.com/user/MatGubbins/media/bmsix_zpsc33279a2.gif.html][IMG]http://i…
Reworked the bomb exploding routine, saved a massive 3000 tstates ... is pressed, I had a test routine in the wrong place. Remember ... /> Blue Arrow, Click here to start download from Sendspace
Leading Zeroes on a Score in BASICI'm trying to print the score with leading zeroes such that it's always 6 characters wide, i.e.: 000010, 000150, 006100 etc. I quickly knocked thi…
... start time;
* execute routine test loop;
* mark finish time;
* finish - start = test ... number of lines. Optimally the test routine should be contained in one ... line search times for the test routine. Similarly, any variables used by ...Leading Zeroes on a Score in BASICI'm trying to print the score with leading zeroes such that it's always 6 characters wide, i.e.: 000010, 000150, 006100 etc. I quickly knocked thi…
... run a test, insert the lines for the relevant routine from the ... ()): PRINT #0;AT 0,0;"Start : ";st: LET ft=0:
6 REM ... 98: put test routine here
99 NEXT l ... error "A Invalid argument", so start score at 10
6006 ...Reading sequential key pressesI am thinking about writing a quick game and have an idea that requires me to read alternate key presses. I’m thinking along the lines of Daley Thomp…
... of the screen. Just a test routine but the code in the ... (hl), e ; clear flag to start with
Loop ld ...Hacking the ZX Spectrum 48K ROMHi Guys, I have modded my Speccy with a dual boot ROM loading on first bank the original ZX kernel and on the second bank an enhanced version. I h…
... certainly wouldn't want to start moving routines around in memory ... can tweak the initial memory test routine to fill memory with $FE ... $02 and test on increments instead of decrements; the routine still works ...Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
... RAM test routine I'm thinking the next step is to start pulling ...Loading Images/Screens mid-gameHi all, Looking to get back into a bit of coding and I couldn't figure out a way to do the following: I have an image/SCREEN that I'd like to b…
... * 24 cols area; the timer routine starts at 9991):
[code ...Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …
... i find very interesting loader routine in ex Yugoslavia magazine "Svet ... /> Authors of article, calls this routine "bit-loader" and she load ... screen must be at 49152, routine start at 65024 and she loads ... and here is link and routine listing:
[url] ...+3 FaultsI have some Spectrum +3s for testing - looks like they all need drive belts. One will not start up and shows a screen of yellowy green, then one of …
... .
One will not start up and shows a screen ... +3 have a keyboard self-test on start-up?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 ...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 ... shadow registers) before calling my test routine I do not see the ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... />
jr Start
; **** START INTERRUPT ROUTINE ***
... /> ; **** END INTERRUPT ROUTINE ***
Start:
ld ... ; 2 = RO:XOffset (Start at 0)
; 3 ...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 ...Who knows how to program a "pathfinder"?Hi all. I like to play games like "Colour Lines" and I think, I will create a version of this game for the SAM Coupe. It looks easy - until this "dam…
... /> or a
ret z ; test on empty field
inc ... a
ret z ; test on blocked field
ld ... /> ld a,stx+sty ; test on start reached
cp l
Who knows how to program a "pathfinder"?Hi all. I like to play games like "Colour Lines" and I think, I will create a version of this game for the SAM Coupe. It looks easy - until this "dam…
... /> or a
ret z ; test on empty field
inc ... a
ret z ; test on blocked field
ld ... /> ld a,stx+sty ; test on start reached
cp l
