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Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... marker
;
push hl ;save off current position ... in Message
push bc ;save off current Character ... Character to the Screen
call p_print ;
pop bc ;restore the current ... br /> call p_at
push de
dec b< ... -
Some TR-DOS technical questionsHi forum, I sincerelly hope this was the right section of yours to ask this kind of stuff in. (else return facepalm;) Anyway, here's a couple of que…
... 'm really rather new to the hardware side of things, ... retries
ERR PUSH HL ;
PUSH BC ;
LD ... (breaks within the prec. trd. routine)
POP BC ;
and #7f ;
pop hl ;
JR NZ,ERRCHK ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... of Character Data to put down
p_print0 push af
... Y values]
p_print1: push hl,de,de
; ... to split the Rotated Character Data over a Character boundary
p_print3: pop ... /> ;Similar to the first Byte, we need to Invert the mask with a ... -
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 …
... the documents of the dissasemble of the Spectrum rom, in the documents you said the ... /> LD B,A ; transfer count to B.
INC B ; increase ... before and after call the routines:
push bc
ld ... -
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 …
but always when i call a ROM routine i must do the same pushes and pops ? The same ?
push bc
ld bc,#5d70 -
'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
...
; Write the 8 bytes of the character bitmap to the screen.
next_scanline:
push bc ; Free up a register ... /> ; makes it easy to jump to the next scan-line, like ... -the-screen to the next.
inc e
pop ... -
Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …
... /> push bc
push hl
;first we need to fill the attributes ... got the address in hl
pop bc
push bc
pop hl
pop bc
call downHL ... -
Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …
... /> push bc
push hl
;first we need to fill the attributes ... got the address in hl
pop bc
push bc
pop hl
pop bc
call downHL ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... of Character Data to put down
p_print0 push af
;save ... values]
p_print1: push hl
push de
push de
;save ... to split the Rotated Character Data over a Character boundary
p_print3: pop ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... +249
; push bc
; call print_char
; pop bc
; ld ... off bottom of screen
push bc
;save off Y ... values used
pop bc
;get the Y and X values ... (hl),e
;set the Attribute address to the line below - and set ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... the opcode is and where the registers point to:
[list]
[*] whether the ... . 32 LDI instructions in a push/pop loop with B going down ... is to make use of the stack pointer register and PUSH data onto the ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
Well. This is my contribution to the list of vertical scrollers. This one uses PUSH/POP transfers, and no HALT's to sync with the screen (I just wanted to see how fast I can achieve).
[url]http://www.atc.us.es/~rodriguj/scroll_vertical.sna[/url] -
Games only possible in 128K mode?In the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=30145[/url] the discussion of 128K only games comes up, and it made me w…
... call in the interrupt routine of Beepola's assembly output (PUSH POP BC ... so drums work). I was intending it to be ... yet, I need the original game to copy the correct patterns of falling ... [/url]
Press BREAK to stop the basic and type RUN ... -
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 …
... .[/QUOTE]
That's the important point. You save a ... time on the [b]push[/b] and [b]pop[/b], but have to give ... much of it back as you move the stack ... 'm asking about optimising a push/pop byte copier that uses a ... -
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 …
... time on the [b]push[/b] and [b]pop[/b], but have to give ... have gasman's example of push/pop copy used for multicolor or ... my description of push/pop copier from CHASE H.Q ... about PUSH/POP copy don't forgot contetion (and you copy to screen ... -
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 …
... this VBLANK\HBLANK technique to use shift data around ... is it just confined to Demos and simplistic games? ... if anything was maxxing the amount of data being ... approach it would be the Ultimate games?[/QUOTE]
push/pop a lot. but real ... -
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 …
I used the PUSH/POP method on Rallybug, then again ... the technique to scroll the text window, not to mention a load of PUSH instructions to ... clear the ... -
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 …
... but could only manage to change the colours of alternate ... to POP/PUSH. As I said, it's marginally quicker but the ... Spectrums) actually manage to synch themselves around the contention. This ... it came to the PC, things went completely the other way round ... -
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…
... it I finally got the program to run properly! :o ... ; ADD DE to HL 19
230 POP DE ; Restore ... bytes 20EF
260 PUSH DE ; Store DE on ... address ED52
300 POP DE ; Restore DE D1 ... /> It is very quick compared to the BASIC program:
... -
Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…
... it worked, transposed the keyboard to show the the correct notes that ... br /> Here are the additions I made to the Beepola .asm output.< ... br /> drawch1: push af
push de
push hl
... br /> lf18a: pop hl
pop de
pop af
... -
Plastic Help. Plastic Hell.A few weeks ago I brought a very good condition push chair 2nd hand. It was ideal because it is designed to to be part of a travel system and goes wi…
... talked to Graco and they no longer stock the part as the push chair ... they expect only the chairs they currently sell to brake. ;)
...
I think one will pop up ... a source of potential scratches to the tray.
It ... -
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…
... done. HL=Address.
push HL ; save address
LD ... we are crossing from the right edge to the left, and we shouldn ... needing to do that)
DJNZ BLPaintWidthLoop
BLPaintWidthExitLoop:
POP ... -
logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…
... to the beginning of this space too.
push de ;Store the pointer to the ... evaluating.
pop hl ;Recover pointer to expression. We ... at the top of the calculator stack.
pop hl ... -
logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…
... evaluate the two params.
push hl ;Store temporaly the pointer to the param block ... copy the param block to the workspace.
pop de
push de
Opinion on new 128K only gamesHello, Being new to the WOS community, I am unclear on the attitude towards 128K only software, that is; Is there a strong need to support the 48K m…
... 'burst' system will be ported to the Spectrum.
I tend ... /> ; ------------
.slow_down:
push edx ; ***SLOW VERSION***
jne .slow_across
pop edx
add esi ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... to write the final Z80 code so no memory was modified, thus PUSH/POP ... or CALL/RET were not used. The IX register ... going to add a function to send the Z80 register state to the PC ...
Here is the Z80 to send data to the AUX port @ 57600 BAUD ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... />
Notice the limited use of 'PUSH' and 'POP' and the large values loaded ... the change to a rectangle area of the display. It is used to keep the ... ' label until it drops through to the 'terminate' code. It uses a ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... br /> Notice the limited use of 'PUSH' and 'POP' and the large values ... memory cycles to load) you can pre-load the constants into ... especially in tight loops, to avoid having to fetch more from memory ... Z80 terms when trying to program the 6502, never a good ...Printer Printing Problem (assembler)I've a program that outputs to the lower screen at various places, using a combination of calls to RST $10 plus OUT-NUM-1 and PR-STRING. It also call…
... routines which I want to go to the printer instead. The one shown below ...
push bc
ld a," "
rst $10
pop bc ...
push bc
ld a," "
rst $10
pop bc ...Printer Printing Problem (assembler)I've a program that outputs to the lower screen at various places, using a combination of calls to RST $10 plus OUT-NUM-1 and PR-STRING. It also call…
... routines which I want to go to the printer instead. The one shown below ...
push bc
ld a," "
rst $10
pop bc ...
push bc
ld a," "
rst $10
pop bc ...
