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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 ... -
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…
... ,4000
0x5CD6 LD BC,1800
0x5CD9 LDIR ... ,EA60
0x5CE1 LD BC,011B
0x5CE4 LDIR ... 0xEA7E DEC H 4t; Decrement higher part of pilot pulse ... ROM)
0xEA90 LD BC,3B0E ; Timing constant 3B ... -
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 ... -
How can I make a UDG rotate?I designed a set of UDG's that can be used for making shapes or letters. Trouble is that my circle - for example - consists of 4 pieces and it would…
... 7,E
DJNZ mask_sprite_a_loop ; Decrement B. If it's not ... /> ; Needs to preserve BC
PUSH BC
LD BC,64479 ; Kempston X ... -
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... 9
loop dec b ;decrement counter
rlca ;rotate the ... )
ret ;retrieve the result (BC) from BASIC (PRINT USR 40001 ... -
Kempston Mouse DriverHi Folks, Does anyone know the email of Chris Cowley who wrote the Kempston Mouse Driver in the WOS Archive? Many thanks Paddy
... 0,E
DJNZ mask_sprite_b_loop ; Decrement B. If it's not ... />
restore_bgr
PUSH BC
LD BC,(OldXY)
CALL get_screen_offset ... /> ; Needs to preserve BC
PUSH BC
LD BC,64479 ; Kempston X ... -
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 ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... tstates: acknowledge the interrupt and decrement SP.
* M2: ... 7 tstates: acknowledge interrupt and decrement SP.
* M2: 3 ... 6 tstates: acknowledge interrupt and decrement SP.
* M2: 3 ... tstates: acknowledge the NMI and decrement SP.
* M2: ...
