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Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…
... 7
ld ($5b5c),a
out (c),a
ld sp,$9c40 ; ... $f8
ld ($5b5c),a
out (c),a
pop bc
... or 7
ld ($5b5c),a
out (c),a
ei ; interrupts should ... $f8
ld ($5b5c),a
out (c),a
ld sp,($9000) ; ... -
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... /> and 7
ld c,a ; destination page
ld ...
; destination page is a
paginar:
di ... /> ld (BANKM),a ; BANKM is updated
out (c),a
ei
out and save 9 bytes.
a REM of a given length (to ... -
The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... it from numerous sources, including a few members of this forum ... br />
[code]
ld a,($5b5c)
and $f8
di
ld ($5b5c),a
out (c),a
ei
ld a,%01001000
ld ($5800),a
pop af ... -
128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …
... write the new value back out.
What ... I can't figure out is how to read the ... current value into A. IN A,(nn) seems to be ... port number, then do the OUT (C),A instruction. It's just ... 32765 for write
OUT (C),A ;Write new value to 32765 ... -
Switch to 48mode without 'SPECTRUM' commandIs there a poke(s) to switch to 48 mode without SPECTRUM command. I want my tape loaders to switch automatically. I know how to switch ram banks ok…
Is there a poke(s) to switch to ... BC,32765
LD A,20 ;(BANK4)
OUT (C),A
CALL 23760 ... -
sound effect code causing crash[FONT=Courier New]I have just written this piece of code to produce a lazer sound effect but for some reason it is causing a crash and I can't figure…
... : LD A,0: OUT (C),A
LD BC,49149: LD A,200: OUT (C),A
LD ... BC,65533: LD A,8: OUT (C),A
LD ... -
Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…
... with paging memory in and out (not achived this yet) and ...
ED 78 IN A, (C)
ED 79 OUT (C), A
06 00 ... LD B, N
4F LD C, A ... -
SPIN's breakpoints - an overviewAs quite a few people have been asking how to set breakpoints on memory write etc. in SPIN, here's a description of the way the breakpoints work. Get…
... ADDRess, and there's also a corresponding RADDR (Read ADDRess). You ... />
One thing to watch out for, regarding port I/O ... such instructions as "OUT (c), a", the port number is C - but the value ... mask off specific data in a condition:
[code]
... -
AY-player from Rastan SagaHello. For what ports #3F, #5F in the given fragment of a code are used? They give What effect in sounding? ================================= F4C1 21…
... F4CA 32C0F4 [B]ld (F4C0),a[/B]
F4CD 013FFF [B ... ]
F4D0 ED51 [B] out (c),d[/B]
F4D2 0EFD ... ]
F4D4 ED51 [B]out (c),d[/B]
F4D6 06BF ... ]
F4DC ED79 [B]out (c),a[/B]
F4DE 15 [B ... -
128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…
... (hl) ; set rom1
ld a, (hl) ; get value
... ; disable interrupts for page
out (c),a ; and page
... (hl) ; set rom0
ld a, (hl) ; get value
... ; disable interrupts for page
out (c),a ; and page
... -
So... you want to format your 3.5" as 720K eh?Well, i've been trying to get hold of an application to make proper use of my 3.5" +3 floppy disks but i haven't been able to find any. I stumbled up…
... %10111
LD (23388),A
OUT (C),A ; Page ROM 2 and RAM ... 6
LD (23388),A
OUT (C),A ; Actual paging here
EI ... -
converting ZX128 software for SAM COUPESAM COUPE is computer compatible with ZX48 model. Use same ports, same keyboard with compatible membrane, 64kB adress space with possibility connect …
... :
LD BC,32765
OUT (C),A
And we can replace ... :
AND 7
OUT (129),A
3) disable AY sound ... -
Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…
... ROM. If 1 there is a connection to an additional (Free ... m planning to use [b]OUT (C), A[/b] with [b]bc=0x1FFD ... [/b] and
A=1 for RAM 0,1 ... ,2,3
A=5 for RAM 4,5 ... ,6,3
A=7 for RAM 4,7 ... />
Keeping bit 3 of A low will also function to ... -
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…
... +1), a
ld a, (23399)
ld (rombkup), a
ld a,4 ...
ld bc, 32765
out (c),a ; execute paging
ld (bankm ...
ld bc, 32765
out (c),a ; execute paging
ei ;
ZX rom type detectionHere is routine for fast detection of zx rom / computer model. [URL="http://velesoft.speccy.cz/other/ZXROMDETECT.zip"]http://velesoft.speccy.cz/othe…
...
; OUT (C),A
; LD B,#7F
; LD A,#10
; OUT (C),A
LD BC,0
LD A ...draw single pixel in the borderI have problems with drawing in the border. I can get it to draw a line ,but it always becomes a line and not a single pixel. <br><br>rept 3580 <br…
...
ld a,3
out (c),a
out (c),b
endm
out (c),a
out (c),b
gives ...
This screen also shows a second question. You can see ...Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …
... life of me figure out what I've ... ; Bank 5
ld c, 0 ; Screen Normal
... ; Bank 7
ld c, 8 ; Screen Shadow
ld (0x5b5c),a
out (c),a
ret
...Flicker-free animationTrying to create flicker-free screen update, but... Where I'm wrong? [url="https://dl.dropboxusercontent.com/s/pfywhfejfmwt2zq/test_128.sna"]Snaps…
... a, (keeper)
rrc a
ld (keeper), a
ld (hl), a ...
swap_video:
ld a, 0x17
xor %0010
ld (swap_video+1), a
ld bc, BANKS
out (c), a
New Windows Spectrum Emulator: CSpect V0.2 ZXSpectrum emulator by Mike DaillyNew Windows Spectrum Emulator: CSpect V0.2 ZXSpectrum emulator by Mike Dailly (Found on SpecNext Facebook-Page) Info and Download (=klick "CSpe…
... register
ld a,22
out (c),a
ld a, ; 0 to 255 ...
ld bc, $253B
out (c),a ... /> out (c),a
ld a, ; 0 to 191
ld bc, $253B
out (c),a ...Restoring AY registersAfter doing (not still finished) the sna to tap converter, I'm going to try to do the same for 128k snapshots. I've got threee ideas about what to do…
... />
AY registers would be "out of sync" in procedures 2 ... snapshots. Procedure 3 is less "out of sync", but produces more ... routine placed at 16384 loads a headerless block starting at 16484 ... at address 7805: an out (c),a followed by a ret. I was thinking ...Help With infinite music on 128KHi :) I'm trying to play infinite simple music on 128K , but i don't know what is wrong with the loop I tried this routine but doesn't work I…
... bucle
ld a,(hl)
or a
jr nz,waitSound ... br /> ld bc,$FFFD
out (c),a
inc hl
ld ... br /> ld b,$BF
out (c),a
inc hl
... ),hl
dec a
ld (hl),a
ei
Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…
... separate in the sense that a different signal (/mreq and / ... i/o instructions like IN A,(C); OUT (C),A; IN A,($FD), etc.
< ... br /> Here's a little helper for beginners: the ... /> B = 8 bit counter
A = 8 bit accumulator, comparison operand ...Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…
... separate in the sense that a different signal (/mreq and / ... i/o instructions like IN A,(C); OUT (C),A; IN A,($FD), etc.
< ... br /> Here's a little helper for beginners: the ... /> B = 8 bit counter
A = 8 bit accumulator, comparison operand ...
