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ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…
... make similar use to "DEC BC", and actually detect a zero ... instructions have to repeat until BC==0 so they have ... and you want to 'dec bc' and repeat if not ... :
[code]
cpi
jp pe, loop_again
inc hl
dec bc
ld a,b
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
...
DEC BC ; Compensate for CPI increment
SUB ... Param
CPI ; Critical set of instructions ...
DEC BC ; Compensate for CPI increment
SUB ... EX AF,AF'
CPI ; Critical set of instructions ...ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... not familiar with the [b]CPI[/b] instruction, since it compares ... pattern
CMDADDR LD A,(BC)[/code]
Follow the ... byte instruction [b]LD A,(BC)[/b], followed by a "manufactured ... ,R = 0x0003[/b]], due to BC contents
NOTE: ...Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…
... operations (LDI, CPI etc), PO is set when BC reaches 0, otherwise ...Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…
... /> INC HL
DEC BC
LD A,B
INC D
CPI
JP PE, Loop
The CPI instruction does "INC HL; DEC BC; set PE flag ... if BC!=0". It also ... in this usage.
CPI+JP -> 5 bytes, 26 ...Games for relaxHi fans ! I've not enough time for playing the old spectrum's games. I played a lot in the past, I read all topic and try many games what you write …
... annoying !
I forget BC Bill and last time I ...Certain Games Wanted - Very Good Prices PaidHi I have been after a few games now for ages and have turned to this forum as the last resort, can you help? I will pay ?5.00 for each of the follo…
... - Ultimate
Schizoids - Imagine
BC Bill - Imagine
Zolyx - Firebird ...Short Z80 QuizQ1) Which program gives different result ? A) XOR A ADD A,A B) XOR A ADC A,A C) SCF ADD A,A D) SCF ADC A,A Q2) What is the equivalent of NEG …
BC 's Quest For Tireswhen playing this game you can only use keyboard right?.WRONG.if you press the letter "p" while the game has started(paused and waiting for input)a c…
when playing this game you can only use keyboard right?.WRONG.if you press the letter "p" while the game has started(paused and waiting for input)a control screen comes up and you can select keyboard,kempston,interface 2 and protek(cursor).i hope this ...250,000 Games..... Instalment the FinalAll, I have just got this Email from Andy (Sirclive) //quote Hi Tony , well here we are again ! , situation good for you wos guys , bad for ebay …
... , magic knight trilogy
(disk) , bc quest for the tires , ghostbusters ...BC Bill does this game work with a emulator?Can anyone get this game running with a emulator. I get as far as the main screen but can't start the game
Can anyone get this game running with a emulator. I get as far as the main screen but can't start the gameURGENT programming question !I've gotta draw a line from machine code using the standard routine at 24B7, which expects the delta-X and delta-Y values on the BASIC stack. I put t…
... the stack by calling 2D2B (BC -> BASIC stack). However, it ... only for positive values of BC. Anyone know how to put ... a negative BC on the BASIC stack ?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 …
... - you set the value in BC to the port number, then ... page number
LD BC,32765 ;Set BC to 32765 for write ...AssemblageCan any of you marvellous programmers out there recommend a Speccy assembler that even a complete dunce could use? At the risk of sounding thick, as…
ANN: Tipshop updated Wednesday, 10 March 2004Wednesday 10 March 2004 An updated search script, and the tips cross the 10,000 mark! * Yep, you read that correctly - we now have over 10,000 tips…
... Prix, Alien Storm,
Assassin, BC Bill, Beach Head 1, Beverly ...RST 16 with TASMCan any body tell me what is wong when I assemble this test code with TASM : ;print a long string "help me" start .org 32000 ld a,2 call 5633…
... /> ld de,data
ld bc,7
loop ld a ...
or c
dec bc
ret z
ld ...FAST PIXEL DRAWINGI'm looking for the fastest way to put a pixel to the screen (on spectrum ofcoz:). Here is my own procedure (written in PASMO). But I don't how do it…
...
and 00000111b
ld bc,bits
add a,c ... c,a
ld a,(bc)
ld b,(hl ...Can you remember this game?You played a Caveman who had to collect dinosaur eggs whilst hitting a tyrannosarous rex with hammers. I've had a brief look and it definately wasn'…
You played a Caveman who had to collect dinosaur eggs whilst hitting a tyrannosarous rex with hammers.
I've had a brief look and it definately wasn't BC or Caveman.IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…
... ;pointers to address
ld bc,260 ;229*256+229, i ...Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... /> INC HL
POP BC
;| this cycle makes ... /> INC HL
POP BC
DJNZ DRAWMID
... br /> DRAWEND
PUSH BC
EXX
LD ...Calculate screenaddressWho knows where the topic about the fastest screenaddressroutine is? I can't find it in a search.. The fastest routine was to load a large table of …
Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
...
Spriteloop:
PUSH BC
CALL MoveSprite< ... DE
POP BC
DJNZ ... HL Contains Screen Address
; BC preserved
; Example ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... /> PUSH AF
PUSH BC
PUSH HL
...
Spriteloop:
PUSH BC
; Is ... HL Contains Screen Address
; BC preserved
; Example ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> lp1:
PUSH BC
PUSH DE
POP BC
LD A,(YPOS ... PUSH AF
PUSH BC
PUSH HL
POP BC
POP AF
...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... /> INC B
PUSH BC
CALL WRITECHAR
POP ... /> INC B
PUSH BC
CALL WRITECHAR
POP ... /> INC B
PUSH BC
CALL WRITECHAR
...
