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r-type in development for the sam coupehttp://cookingcircle.co.uk/ we need z80 coders graphics artists and audio this is the amstrad cpc 6128 version: https://www.youtube.com/watc…
... rom routine to use the stack pointer and push graphics to video ... -
r-type in development for the sam coupehttp://cookingcircle.co.uk/ we need z80 coders graphics artists and audio this is the amstrad cpc 6128 version: https://www.youtube.com/watc…
... with push and using the stack pointer as a reverse cursor - i ... rom routine to use the stack pointer - unless it offered a selection ... -
Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…
... locations will work - changing the stack pointer does not alter the contents ... of the stack itself. However, first you must ... find out where that stack is located! Can you work ... -
Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…
... you want to get the stack pointer in BASIC, there's an ... a bit fiddly with the stack pointer as you can't copy ... /> The routine will put the stack pointer into BC, and on returning ... -
48K Memory MapHi, I'm having some trouble understanding the top of the 48K Memory Map. From reading elsewhere I have this as the memory map: 0 to 16383 - …
... />
SP is the Z80 stack pointer register i.e. the machine ... stack
See [url="http:// ... -
Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... bytes, then you do a stack-based shift using AF,BC ... a whole extra pair of stack re-allocations. But on the ... any faster, as hard-coded stack pointer re-allocations are pretty quick ... -
New Game: Vallation.Okay, this has been hinted at by both Redballoon and me a couple of times, but the damn thing is finally done now. :-D [b][url="http://tardis.dk/w…
... eating away at a table/stack pointer. Tried a few strange things ... -
Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…
... the consequences of moving the stack pointer like that!
You ... will be pushed onto the stack (i.e. into the screen ... -
Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…
... the consequences of moving the stack pointer like that!
... will be pushed onto the stack (i.e. into the ... ; self modifying code to save stack pointer
ld sp ... 0000h ; self modifying code restore stack pointer
ei ;re-enable ... -
Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…
... ; self modifying code to save stack pointer
...
restorestack:
ld ... ,0000h ; self modifying code restore stack pointer
ei ;re-enable interrupts ... -
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,…
... bit numbers in memory. The Stack Pointer (SP) remembers the address ... the address in the Stack Pointer is decreased by two and ... INC SP to manipulate the stack pointer directly. For example, if ... so some programmers hijack the stack pointer, point it into screen ... -
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,…
... HL ; store 16384 to stack, change stack pointer by -2 bytes
LD ... value, that is on the stack, change stack pointer by +2 bytes
RET ; get 2 bytes from stack, change stack pointer ... -
What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…
... /> But the Z80 had better stack handling. The 6502 had a ... Z80 had a 16-bit stack pointer that could be set anywhere ... -
Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
Memory questionsQuestion 1: PRINT PEEK 23732+256*PEEK 23733 returns 65535 for a 48K Spectrum and 32767 for a 16K Spectrum. PRINT PEEK 16388+256*PEEK 16389 return…
... the BASIC ROM sets the stack pointer to the top of available ...Memory questionsQuestion 1: PRINT PEEK 23732+256*PEEK 23733 returns 65535 for a 48K Spectrum and 32767 for a 16K Spectrum. PRINT PEEK 16388+256*PEEK 16389 return…
... the BASIC ROM sets the stack pointer to the top of available ...More basic assembly stuff!I've been figuring out some more stuff using CALL and DEFB but this has me a bit stumped. [code] ORG 33000 LD BC, 16384 PUSH BC CALL GO RET …
... top of the stack and decrements SP (stack pointer) by two ( ... on top of the stack[/i] and decrements SP ... the top of the stack now contains the address ... increments[/i] the stack by two. The stack now points to ... from the top of the stack (16384) and increments ...Xmas present from Hood:))Dear MB-02+ users, on my site[url="http://hood.speccy.cz"] http://hood.speccy.cz[/url] I have made quite significant update in download section. B…
... run another BASIC file, because stack pointer was not set. Now OK ...shadow regs musingIn the process of optimising some assembler, it occurred to me how great it would have been if the Z80's shadow reg opcodes had been a bit more fully…
... useful would be a shadow stack pointer, It would be very handy ...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…
... is impossible to store stack pointer value on stack, and retrieve back in ...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…
... />
ld sp,(quit_sp) ; restore stack pointer and interrupts, then return to ...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…
... /> You can also use the stack pointer to speed up restoring the ...1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... a ;reset the index pointer
ld (hl_store ... a ;update the index pointer
calc_data_addr:
Stack Pointer
ret ...Loadsa bullets on screen (silkworm)Did games like silkworm just draw everything to the screen or did they have complicated optimisations? and the types of games where sprites can occu…
... just because we know about stack copying. Two LDIs take 32 ... to keep re-loading the stack pointer every 16-20 bytes. The ...1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... a ;reset the index pointer
ld (hl_store ... a ;update the index pointer
calc_data_addr:
Stack Pointer
ret ...Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…
... changed (well, except the stack pointer), so A still holds the ... return address of the stack and jumps back to ... return address off the stack into a register you' ... on the top of the stack before calling RETurn. Just ... of values off the stack afterwards as you don' ...Witchcraft: Nirvana, Bifröst and such[url="http://www.rgcd.co.uk/2011/10/buzzsaw-zx-spectrum.html"]"When considering this next to nearly every other ZX Spectrum game though, Buzzsaw is l…
... a safe copy of the stack pointer for later, then point the ... stack alternately at your data and ...Machine code routine neededHello! Please i'm looking for a short routine that can write the same value in a range of continous memory locations. For example, to write 255 val…
... +1),sp ; save stack pointer
ld sp,41000 ; set stack pointer
ld ... ; put 255,255 on the stack 5 times
push hl ... /> savesp: ld sp,0 ; restore stack pointer
ei ; enable interrupts
