-
RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…
... rebuilds the workspace from the ROM, so in place of ... br /> call $17d0 ; initialise A: & B: extended XDPBs
ld ... as:
[list=a]
[*]switch to ROM 2, RAMpage 7
[*]switch to ROM 3, RAMpage 4
[/ ... -
Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…
... bc,8192 ; M1 ROM length
xor a ; A = 0
... 32
xor a ; A = 0
ld b,a ; B = 0
... /> In case of a damaged ROM, this routine will identify ... ,8192 ; M1 ROM initial address
xor a ; A = 0
Screens and BasicA question about the ZX screens. I am using software to convert my own art and drawings to the ZX Spectrum. I have some tools to change .jpg files in…
... would become "DEF FN a$(a$,b$)=""", where a$ is in the display ... DEF FN to DEF FN a$(a$,b$)=""
* line 31 : ... * line 51 : change LET a$ to LET a$=b$
It' ... from BASIC, as the ROM will load the page ... not being used by the ROM (eg. for BASIC, ...Calling all Spanish +3 owners...Please see [URL="http://www.worldofspectrum.org/forums/showpost.php?p=693601&postcount=40"]this post[/URL] Could my search for photographic evidence…
... /+3 ROM A v4.0 English
40093 Spectrum +2A/+3 ROM B v4 ... +2B ROM A v4.1 English
40093U Spectrum +2B ROM B v4.1 ... English
40094 Spectrum +2A/+3 ROM A v4 ... .0 Spanish
40101 Spectrum +2A/+3 ROM B v4 ...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…
... the first time the Shadow ROM is paged, not only does ... ,3: DEF FN a(b,c)=b+c: DIM a(1,2,3): ... a$=CHR$ b
31 PRINT CODE "a"+COS B+EXP c+FN a(b, ... c): LET b=IN 12345 ... PRINT TAN a+USR b
35 LET a=USR "a": LET b=VAL "b": LET ...Buzzer sounds tips'n'tricksSo I have an ARM Cortex M3 with a buzzer connected to its GPIO pin. And because I read this forum I know that there is no need to add a separate buzz…
... to do interrupting drums using ROM data (which isn't ... stack and load hl with a target ROM address. $3000 usually does ... /> dlp2: call dlpx
ld a,b
or c
jr ... br />
dlpx: ld a,(hl) ;read ROM data
or %11100111 ...Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... to be the Spectrum ROM, (a Divide Plus maybe can ... [*]Try to fault find without a ROM based test program,
[*] ... who can loan you a test ROM (it has to ... build a test ROM (I myself use a ROM cartridge in a Interface ... you?
[I][B]Mark[/B][/I]CODE SCREEN$ in MCIs there any way of determining what character is displayed at a certain co-ordinate from machine code like the 'IF CODE SCREEN$=' arrangement in bas…
... you may call to the ROM routine (PASMO assembler):
< ... equ 2BF1h
;Input: B=column (0-31)
; C ... string from stack
ld a,b ;string length in BC. DE ...Spike: 48k onlyDoes anyone know what's going on with Spike? [URL=http://s1142.photobucket.com/user/daveyboyhughes/media/spike_zps232a1745.gif.html][IMG]http://i114…
... they're loaded into memory. A typical scheme is 1) ... 2) with the content from a specific ROM area-- the problem being ... at $5aff) as well as ROM. The total length is $ ... down to the start of ROM at $0 it starts at ... ixh, $5a
5b28: ld a, b
5b29: or c
Spike: 48k onlyDoes anyone know what's going on with Spike? [URL=http://s1142.photobucket.com/user/daveyboyhughes/media/spike_zps232a1745.gif.html][IMG]http://i114…
... this process (decryption using rom) and what is ... /> dec bc
ld a,b
or c
... when a SCREEN$ is encrypted against a regular 48K ROM:
a regular 48K ROM you get this ... decrypt against, for example, a +2 48K ROM:
...Strider II (and others) + 3 disk versionsHello everyone, I've been working on converting some games to be able to load them from the +3 floppy. I started with single load games but now Im i…
... PAGE_H ;page 7, ROM 2 (DOS)!!
XOR A
OUT ( ... BC,$2ff
LD (HL),A
LDIR ;erase screen< ... br /> call $17d0 ; initialise A: & B: extended XDPBs
ld ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... no edge found
ld a,b ; place loop counter into ... length from stack
ld a,b ; place high byte into accumulator ... pressed
jp z,0x1b7b ; ROM routine indicating BREAK (code L ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... no edge found
ld a,b ; place loop counter into ... /> ;; same colour scheme as the ROM loader
macro ...
macro border
sbc a,a ; A=0xFF on high edge, 0 ...Hardware description - MB-02+ interfaceOn this thread will soon released info about MB-02+ idisk interface ( memory paging mechanism, list of ports, addressing, MB IDE, schematics, etc... …
... - memory paging[/B]
Only 16kB rom/ram pages is ... ZX rom
D7 - log.1=connect rom memory instead ZX rom[/B][/code ... memory and connect ZX rom
[B]Example of copy custom ... -02+ ram (rom emulation):[/B]
DI
LD A,64+32+5 ...New hardware for Spectrum from ShaosI have some ideas for new ZX-peripherals and quickly designed a prototyping board for experiments: [URL=http://nedocon.com/store/speccy/][IMG]http:/…
... start page - A for 1st half of the ROM and B for 2nd ... is used to choose ROM half (0 - A, 1 - B)
bit 7 ... is used to disable onboard ROM (switch ...Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... was reading through the +3DOS ROM disassembly. Could the carry ... This involves a trip to the A register ("sbc a,a; and 0x01 ... radix)
#define utoa(a,b,c) utoa_callee(a,b,c)
[/code]< ... occurrences of "utoa(a,b,c)" with "utoa_callee(a,b,c)" but leaves ...Break into programIs there any way of stopping people using the break option in my software productions so they can list the code.
... it is called by the ROM whenever an error report occurs ... tadd+tlen-1: READ b: POKE a,b: NEXT a:
RANDOMIZE FN p ... /> 9994 DEF FN p(a)=PEEK a+256*PEEK (a+1)
9995 ...Break into programIs there any way of stopping people using the break option in my software productions so they can list the code.
... it's in a different place in each ROM so each ... br /> FOR a=23601 TO 23605: READ b: POKE a,b: NEXT a:
... br /> FOR a=23601 TO 23605: READ b: POKE a,b: NEXT a:
... br /> FOR a=23598 TO 23605: READ b: POKE a,b: NEXT a:
...RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... e,c
78 ld a,b
FE3F cp $3F
57 ld d,a
A8 xor b
A9 xor ... rlca
5F ld e,a
EDA8 skip ldd
ROM as theres a pause after the screen ...Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …
... a copy of the Sinclair ZX Spectrum 48k ROM[/B]. ... /> ;
COPY_R OUT (ROM),A; Page out RAM
LD ... ;
MOVE_R OUT (ROM),A; Page out RAM
... /> LDIR
OUT (ROM),A; Page out RAM
...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... published in The Complets Spectrum Rom Dissasembly.
[ ... EX AF,A'F' The A register holds +00 for a
... found close
LD A,B together - these will be ...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... trouble with not using the ROM routines is that devices like ... the original ROM then you really ought to add a "portions copyright ... (derived from the SAM skeleton ROM):
[code]; THE 'LD- ... ; until two found
ld a, b ; close together
cp 212 ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... if not
ld a, b ; column to A
cp 80 ; in ... for paging
ld a, %00001111 ; ROM 0, VRAM1, RAM 7< ... for paging
ld a, %00001111 ; ROM 0, VRAM1, RAM 7< ... /> defs 8, 255 ; unused locations (ROM 0)
.endif
Significant machines by yearI'd roughly divide Spectrum's hardware history into four periods: Sinclair (1980 to 1985), Amstrad (1986 to 1988 ), Russian (1989 to 1996) and Homebr…
... . Grey area copy of speccy rom..... if anyone were to know ... . So LD A, B; OR C; becomes LD A, C; OR B, and so ... tried to license the ZX81 ROM (which contains the math library ... to start with the ZX81 ROM (licensed under the GPLv2), all ...I know it's part ZX81 but what's the rest of it?You can see the ZX81 motherboard in the corner but I have no idea what the rest does, it powers up but I haven't managed to get the screen to tune in…
... as it stands it's a B/W telly or nowt at ... old colour cathode sets are a no no.
... if it retains the original ROM, in some form, it ... is missing which makes this a very early Zeddy indeed.< ... ..Just zoomed in on that ROM board and yes original Sinclair ...
