-
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…
... /> [CODE]in a,(c) ; 12T[/CODE]
with
[CODE]in a,($fe) ; 11T ... [/CODE]
The A register then sets ... bits of the IN address. Not a problem though if ... execution, border tweaks and a relocator to handle overwriting the ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... [/CODE]
with
[CODE]in a,($fe) ; 11T[/CODE][/QUOTE]
in order to avoid reinitializing A on every pass ... />
Whether I use IN A,(0xFE) or IN A,(C), you're right ... upper bits of the IN address. Not a problem though if you ... -
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…
... SA/LD-RET.
IN A,(+FE) Make an initial read ... Keep the carry flag in a safe
place ... from port +7FFE.
IN A,(+FE) i.e. BREAK & ... -
Atic Atac on 128kThis may have been talked about before, especially if its not just me with this problem, but loading this on my grey +2 results in title screen, then…
... 938B D3FD OUT (FD), A
938D DBFE IN A, (FE)
[/CODE]Looks ... the keyboard for a keypress, but a typo in the port ... and enables page 6 in the top 16K of ... />
Edit, not a typo, the same port is ... written to using a similar pattern at 93B1 ... -
Questions about Vortex Tracker II exported songsHi, I have been experimenting with Vortex Tracker II lately and have a couple of questions. By exporting the song to TAP format, a file is generated…
... initialization with module address in HL
;START ... to current position value in PT3 module;
... ] ;test key
xor a
in a,(#fe)
cpl
and ... br />
LD A,(27810+10)
RLA< ... -
anteater - new beeper engineJust letting y'all know about a little project I did yesterday, called "Write a beeper engine in 1 day". [url=irrlichtproject.de/downloads/anteater.…
... did yesterday, called "Write a beeper engine in 1 day".[/QUOTE]
a couple of things: In the ntropic engine ... , bit 2 of A is always set before the in a,(#fe) is done ... the stack is in contended memory. CLEARing to a value in the upper ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... address FE00 write code:
IN A,(C)
OR #E0 ... bichos:
open snapshot in HEX editor and find ... DB, FE, F5 (it's or address #6D66 in ZX ram ... ) and replace with C3, 00, FE (jp ... address #FE00 write code:
IN A,(#FE)
OR #E0
... -
New Game(s): Sir Ababol 2 and Sir Ababol DXHere is our own Christmas Present from Mojonia! We weren't going to release these games (at least, by the moment) but we decided just yesterday to fi…
... would work with your LD A,(HL) AND (HL) routines already ...
REPT 5
ld a,??
in a,($fe)
and ??
sub ... d
ENDR
ld a,d[/CODE]
If ... -
Reading sequential key pressesI am thinking about writing a quick game and have an idea that requires me to read alternate key presses. I’m thinking along the lines of Daley Thomp…
... 0100
ld a,#DF ;O
in a,(#FE)
and ... c
ld a,#DF ;P
in a,(#FE)
and #01 ... z
ld (hl),a ;flip the mask value
in case of keypress here
ld a,(hl ... xor #3F
ld (hl),a
ret
.keymask ... -
Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…
... Break' key row
0xEACC IN A,(FE) ; Get key row
... ROM)
0xEAE4 OUT (FE),A ; Set MIC/Border (ROM ... return adress (ROM)
0xEAEA IN A,(FE) ; Sample Keyboard (ROM)
Saving and loading data in assembly.I want to add a save and load feature to an project I'm working on. Since it's not that much data in size I thought I'd use the ROM functions, but ho…
... ld de, #11
xor a
call save_data_block
... ld de, (data_length)
ld a, #FF
call save_data_block
a
out (#FE), a
ei
ld a, #7F
in a, (#FE)
Saving and loading data in assembly.I want to add a save and load feature to an project I'm working on. Since it's not that much data in size I thought I'd use the ROM functions, but ho…
... /> xor a
out (#FE), a
ei
ld a, #7F
in a, (#FE)
a regular load errorCAPS-SHIFT KeyCodeIs there a standard Keycode for CAPS-SHIFT Key ? Looking at the ROM documentation in the Main key table KEYTABLE_A, there is no Entry for CAPS_SHI…
... scan code is simply a mask byte in the top 8 bits ... and a key row in the bottom eight bits ... . So detecting if a specific physical ... />
ld a,l ; hardware key row
in a,($fe)
and h ...Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... b,#31
ld a,#7f
in a,(#fe)
rra
ld a,#7f
in a,(#fe)
rra
ret ...Fastest way of reading from EAR portI'm trying to work out the fastest way of reading data from the EAR port and assembling the bits into a byte. I came up with this code: IN A, (C) ; …
[code]
in a,(#FE)
in e,(c)
rrca
and e
;...
in e,(c)
rrca
and e
rlca
ld (hl),a
[/code]
... or something :)Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
A simpler keypress check:
... /> ;INC E will result in 0
jr z,key_w ... [/code]
Or, without a ROM call and using only ... lines of keyboard
key_w in a,($fe) ;read port 254
... cpl ;invert A
and $1f ;mask ...A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…
... will be modified)
in a,($fe)
and 16 ;mask ... do_left_thingy
ld a,$ef
in a,($fe)
and ... ]
controls_i ld a,$f7
in a,($fe)
and 16< ... br /> controls_i nop
in a,($1f)
cpl
...ive found an attr scrolling routine but i want to remove the smaller scroller within it, etc.https://pastebin.com/K4nG3xbX also i would like to be able to change the colours and not have a shadow. http://www.worldofspectrum.org/pub/sin…
...
XOR A ; FA1D AF
IN A, ($FE) ; check for a key
CPL ... /> LD (L_FB76), A ; increment m2counter
CP $08 ; FB3A FE 08
ive found an attr scrolling routine but i want to remove the smaller scroller within it, etc.https://pastebin.com/K4nG3xbX also i would like to be able to change the colours and not have a shadow. http://www.worldofspectrum.org/pub/sin…
... A, $3E ; A =attribute byte for attribute scroll (1)
[/code]
In ... ]
XOR A ; FA1D AF
IN A, ($FE) ; check for a key
CPL ...Dynamite Dan II - Island 6 - HELP!Hi all, can someone possibly create a snapshot of Island 6 (car park island) on Dynamite Dan II for me please? I'm trying to work out why half the…
... $6cd3
checkpauseon: ld a, $df
in a, ($fe)
rra
jr ... debounce
checkquit: ld a, $fb
in a, ($fe)
rra
jr ...
checkpauseoff: ld a, $df
in a, ($fe)
rra
jr ...Dynamite Dan II - Island 6 - HELP!Hi all, can someone possibly create a snapshot of Island 6 (car park island) on Dynamite Dan II for me please? I'm trying to work out why half the…
... ; load CODE
xor a
out ($fe),a ; BORDER 0
ld a,$f7
in a,($fe)
bit 0,a ; Check for ... 6
ld a,$ef
in a,($fe)
bit 4,a ; Check for ...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…
... of the 8 lines in a character.
It ... passed row and column in range when first ... /> with RET Z
in this code (because it doesn ... we press a
ld a, #fd
in a, (#fe)
... bit 0, a
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…
... entry and pop them in reverse order before it ... 't assume A register has 0 in it on ... does not change A
AND A ; this sets flags ... if we press a
ld a, #fd
in a, (#fe)
... bit 0, a
...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…
...
call text_out
; draw a checkerboard pattern at column 31 ... if we press a
ld a, #fd
in a, (#fe)
bit 0 ... , a
jp z ...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…
... B
; ld a, port
; in a, (#FE)
; to do the ... /> ld a, #7F
in a, (#FE)
bit 0, a
... br /> ld a, #FD
in a, (#FE)
; stash A in C
... ld c, a
...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…
... B
; ld a, port
; in a, (#FE)
; to do the ... /> ld a, #7F
in a, (#FE)
bit 0, a
... br /> ld a, #FD
in a, (#FE)
; stash A in C
... ld c, a
...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…
... entry and pop them in reverse order before it ... 't assume A register has 0 in it on ... does not change A
AND A ; this sets flags ... if we press a
ld a, #fd
in a, (#fe)
... bit 0, a
...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…
... ret
nal24
; draw a checkerboard pattern at column 31 ... if we press a
ld a, #fd
in a, (#fe)
bit ... 0, a
... text_out:
ld a, (hl)
ld e, a
ld d ...
