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Games that will be 25 years old this year....I thought I would make us all feel old and see what games hit the quarter century this year...[url=http://www.worldofspectrum.org/infoseekadv.cgi?wha…
Games hacked to be played with Sinclair Joystick #1 (67890)I have mentioned a few of these in other threads, but I think they kinda deserve their own... I have been hacking a few of my favorite games which ha…
... /tomcat/Arcadia67890.z80[/url]
BC Quest For Tires: [url]http ...Delete keyIs it the case that this: [CODE]ld bc, 0xEEFE in a, (c) rrca jp nc, delete_key_pressed[/CODE] will jump if Caps-shift is pressed [B]or[/B] i…
... that this:
[CODE]ld bc, 0xEEFE
in a, (c ... Delete key?
[CODE]ld bc, 0xFEFE
in a, (c ...Whi different result with Spectrum +3 ?The followed code 10 FOR n=23296 TO 23299 20 READ a: POKE n,a 30 NEXT n 40 DATA 1,127,106,201 50 PRINT USR 23296 causes that the spectrum 48k show…
C/M Why different result with Spectrum +3 ?The followed code 10 FOR n=23296 TO 23299 20 READ a: POKE n,a 30 NEXT n 40 DATA 1,127,106,201 50 PRINT USR 23296 causes that the spectrum 48k show…
Rom Routines list ?Exist some document that show detailled the routines on the spectrum ROM ? Ad for the Spectrum +3 ? are they the same or exist more ? Example i was …
... follow:
push BC
ld bc,#5d70
push hl ...
pop hl
pop bc
This routine is ...How works the Line-Draw ROM routine ?The 'complete spectrum rom dissasembly.pdf' show info related to the draw rom subroutine. The Line-Draw require two sets of parameters: X,Y coordinat…
... coordinates passed by the register BC and the signs passed by ...Obfuscated code ideaThe instructions [b]SUB A[/b] and [b]XOR A[/b] both have the effect of setting the accumulator to zero. The only difference between them is that [b]…
... /> PUSH AF
POP BC[/code] sets BC = 2, while [code]XOR ... A
PUSH AF
POP BC ... [/code] sets BC = 0. Perhaps this could ...Building a menu in ASMWEll as probably some figured, i am learning asm at least to make the basic menu i did in basic. It is a menu where we can select games to be loaded.…
Best Imagine game?Maybe it's purely the nostalgia, but I have a soft spot for Imagine's output (Proper Imagine, that is, not the games released after Ocean bought the …
... bought my 48k+.
BC Bill was another one I ...problem with DEFADD storageI have a function: DEF FN t(t$,m,t)=USR t which is called with, for an example: LET bc=FN t("t$()",mcworkspace,mcputt) where, at the time: mcworkspac…
... with, for an example: LET bc=FN t("t$()",mcworkspace,mcputt ... ,t)=m, and then print bc, it returns 65368.Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…
... ;11
pop bc ;10
add hl, bc ;11
--
POP BC ; Recover A*128 10
ADD HL,BC ; HL=A*192 11
+3 assembler questionI was wondering if anyone could give any suggestions as to how to get this bit of code working on the +2A/+3 in 128k mode. It works on the +128k/+2 i…
... ),A ;in LAST_K
LD BC,9000 ;new line number to ... jump to
LD (23662),BC ;OLDPPC - CONTINUE line number
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…
Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…
... /> [INDENT][FONT="Courier New"]LD BC,1400h
LD HL,4000h ... /> LD(HL),FFh
DEC BC
JR NZ,F9h
BC[/FONT].
Am I ...Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
... exx ; 4
pop bc ; 10
pop de ... de ; 11
push bc ; 11
exx ; ... 4
push bc ; 11 Subtotal = 54
Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…
... Y
010058 LD BC,22528 ;BC=ATTR Address
09 ADD ... /> ED4B01FA LD BC,(64001) ;BC=X
09 ADD HL,BC ;HL=HL ...Various game / utility / cover tapes.Having a clean-out - If anybody interested in buying any of the following drop me a PM. Anything not taken by next weekend will go onto eBay. Games…
Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…
... like:
[code]
ld bc, $04ff ;initial C=$ff, repeat ...Help needed with simple MCode routineI'm trying to code a routine to clear the screen and I can't figure out why it's not working: ld hl,16384 ld bc, 6144 loop:ld (hl),0 inc hl dec bc l…
... /> ld hl,16384
ld bc, 6144
loop:ld (hl ...
inc hl
dec bc
ld a,b
Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…
... /> ORG 32001
LD BC,191 ; Port to IN from ...A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…
... nz, __DRAW3
ld (COORDS), bc
ret
ld (COORDS), bc
ret
;; Also updates BC coords
__DECX:
;; Also updates BC coords
__INCY:
...Assembler intricaciesHi all, I've been looking at the internals of a game to see how it all works and I've found some things that I don't understand and can't find any i…
... space in the temporary workspace (BC is set to 1 so ...Help?Hi All, I wonder if anyone has a few minutes to look at this bit of code I'm working on. I'm trying to move to sprites and want to do it with a scr…
... ]org 33000
keys ld bc,63486 ;press 1 and the ...65 vintage ZX Spectrum games[url]http://cgi.ebay.co.uk/65-vintage-ZX-Spectrum-games-/190500291093?pt=UK_VintageComputing_RL&hash=item2c5ab3c215[/url] Batman The Movie - Ocean D…
...
Hungry Horace - Sinclair
BC's Quest For Tires - Software ...128K games clarification req.While nostalgically thumbing through the April 1986 issue of Computer Gamer I came across a list of games (page 15) that were 'announced' at the laun…
Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
... hl ; 11t - x8
ld bc,$3C00 ; 11t - ROM font mem ... location ($3C00)
add hl,bc ; 11t - move hl to correct ... h for later
push bc ; 11t - store loop counter ... plot again
; *************************************
pop bc ; 10t
ld a,l ...
