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White Spectrum+Hi Folks, There is a photo of a white Spectrum+ on Rick Dickinson's website - did this actually exist i.e. working machine? Paddy
... was dumbed down, and the ROM was crippled. 128 BASIC was ... tester was buggy. The running calculator was relegated to a menu ... bugs in the 48 BASIC ROM were fixed, even though the ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... instructions that need RAM (no stack, no subroutines) and of course ... use this my TESTROM3 utility (rom 16kB or flashable to divide ... -
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…
... diagram showing where the machine stack is in the RAM.
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< ... score
pop hl ;empty stack
ei
ret; ... -
recovering the stack after an errorMy normal error handler starts with the stack as reset by LD SP,(ERR_SP) in $0053 ERROR_2, sets up some stuff and returns to BASIC via a "JP C,$1e73 …
... it's called by the ROM's error handler jumping (via ... six EI commands in the ROM (in MASK_INT itself, START/NEW ... works fine when the old stack values are still in place ... -
my tiny intros[IMG]http://pouet.net/screenshots/60493.png[/IMG] [url]http://pouet.net/prod.php?which=60493[/url] the following work will appear behind Demosplash…
... somewhere that jumping into the ROM at a certain address I ... 1) bytes loaded into the stack.
For now though ... -
Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
... by not using the FP calculator but I expect that it ... -
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... of an expected 'too slow' ROM one could leave the chip ... at this moment; have a stack ready to test by the ... m curious if the 'quicker rom enabling' will help as the ... might not be the DivIDE rom paging in too slow, but ... the ZX rom paging out too slow.
Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
If you want to make it run really quickly then you'll need to ditch the use of the ROM routines - especially the calculator.IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…
... service routine, ZX BASIC, various ROM routines etc. or whatever. This ... they've assembled over the stack pointer when the emulation was ...IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…
... service routine, ZX BASIC, various ROM routines etc. or whatever. This ... they've assembled over the stack pointer when the emulation was ...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 …
... its normal flow or a stack collision has overwritten code or ... it's nowhere near the stack.
[QUOTE]Open the ... addresses on the stack just outside my code (ignoring ROM addresses on ...Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …
... first one you use the calculator to do sqrt. It's ... slow sqrt routine in the rom. They were pushed for space ... ]
There's a calculator version that is about 6 ...Code execution logging/profilingAs revealed in [url="http://www.worldofspectrum.org/forums/showthread.php?t=41666"]this thread[/url], I'm adding support for reading code execution l…
... to add the -r (include ROM area, so the map is ... . The log did report some stack access, which could be hiding ...Tapper - standard ROM timings loader version?I've had at least two copies of Tapper over the years but the most recent one I acquired seems to be a previously unknown(?) variant that uses a stan…
I'm pretty sure that rom-loading tapper version is non- ... 2 onwards, it includes a stack rebuilder and a RES 4 ... before 128K machines, and a ROM-loader would have been before ...Checking for '+2e/+3e' ROMs via Sinclair BASICHi guys, I have a Spectrum +2A containing the '+e' ROMs (and a nice internal IDE interface with a CF card adaptor on it :) ) - If you are unsure wha…
... my code to adjust the stack to redirect the return from ... ;STMT-RET (+2A/+3/+3e ROM.1)
push hl
Tapper - standard ROM timings loader version?I've had at least two copies of Tapper over the years but the most recent one I acquired seems to be a previously unknown(?) variant that uses a stan…
... ]I'm pretty sure that rom-loading tapper version is non ... 2 onwards, it includes a stack rebuilder and a RES 4 ... before 128K machines, and a ROM-loader would have been before ...Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
... /> Messenger snapshots include the Spectrum ROM, but before it is written ... nmi.spx, which patches the ROM beginning at address 08B6h (file ... spx is used to patch ROM beginning at address 0066h). ... a return address to the stack, and the program resumes operation ...Full disk systems for ZX Spectrum?Hello. Although I don't use much more than TR-DOS, but an acquaintance of mine, a user of Atari XL/XE, always says (which is annoying and irritatin…
... is read from DivIDE flash ROM. From the point of view ... disk drive has its own ROM, RAM and CPU. The DOS ... not run a TCP/IP stack (it uses it, bit it ...Getting Unit CHS detail in +3e BASICHello there my fellow WoS'ers I would like to know if there are system VARS or PEEK's that I could use to get the CHS info within BASIC at the mome…
... /commented disassembly of the +3e rom so you'd have to ... paged out your code or stack :)Problem with Page 7I've been experimenting with running code in page 7 (+3) from BASIC and I seemed to have got it sorted out but then it all went wrong. Firstly, I tr…
... resets, which go through the ROM 0 initialisation and clear all ... />
I forgot about the stack. After a reset I'm ... paging out the stack as it goes back to ... position below 65368. Previously the stack was down around 31800. What ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... />
Assuming that the basic rom is present (i.e. it ... need to make any old ROM call that won't affect ... to do is decrement the stack pointer a couple of times ...Accidental rainbow effects.. How do I adapt?I've somehow bizzarrely created a rainbow text effect on my title screen by accident. The title was just supposed to flash different colours whilst …
... when EI there is a rom routine that takes different amounts ... 48k spectrum, with [U]the stack pointer in fast memory [/U ....Z80 File Format when exported by SpecEmuI'm trying to parse a .Z80 file generated by SpecEmu but am getting a few discrepancies from [url=http://www.worldofspectrum.org/faq/reference/z80for…
... to IF1 ROM is causing corruption of the memory and stack.
Stack as well as memory in ...Multiface 3 programming guide anywhere?I'm interested in the tantalising little bit of text at the bottom of my Multiface 3 manual (under the "Using 8K RAM" section): "Please send a SAE…
... /> [1:39pm] from the MF3 ROM when 'returning':
[1:39pm ... is that when the MF3 ROM is paged (or when the ... ]I have disassembled the M3 ROM twice (though not analysed or ... thread preemption lower down the stack (i.e. between DOS and ...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…
It uses the ROM LINE_SCAN routine for syntax checking, ... will page in the shadow ROM to verify the statement.
stack at 65535 and loads the ... mode I could put the stack at 49152-32 and load ...Font hack that was used in a lot of early gamesThere was a little hack for changing the fonts on a spectrum and I remember it being used in a couple of old games on the 48k, it was a sort of ye od…
... error return address on the stack to zero will cause a ... RET instruction in the 48k ROM. The address gets restored by ... the ROM afterwards, so subsequent printing works ...
