... 48k. my_isr() has to preserve registers it uses and then reenable ... to save more of the registers (IX, IY, alternate set) depending on ...

... of optimising, using the IX & IY registers is very slow compared ...

... pair, maybe BC or even IX, IY. You need to do ... graphics first and fill the registers in the beginning.
[/FONT ...
push de
push ix
... next line
push ...

... /> interrupt_main:

; Save all registers, then save the Stack Pointer ... br /> push hl
push ix
push iy
ld ... push af
exx ; exchange registers for alternates
ex af ... br /> pop iy
pop ix
pop hl
...

... register pair and goldfinch uses IX but in z88dk several targets ... which is using the index registers for display generation. We have ...

... :

All the z80 registers are 8 bits: A, F ... architecture allows these 8 bit registers to be paired up to ... as 16 bit registers: AF, BC, DE, HL, IX, IY. This list ... ) and the second set of registers AFBCDEHL' available after an EXX ...

... , 0x1b40 ; data length
ld ix, image ; address of data
registers
ld c, 0x3b ; set ...

... extra address and counting registers, but use A, IX, IY and the ... are no alternates to the IX and IY registers.

... " to me ;)

Index registers better than push and pop ... of normal registers though?

EDIT: It ... program ;)[/QUOTE]

Index registers are great, as you say ... a C struct. I use ix to manipulate sprites all the ...

... don't use the index registers because they are slow and ... any one time, and using ix just makes the code more ...

... any one time, and using ix just makes the code more ... />
I have used index registers a lot, but over the ...

... - instead of using the index registers. The code is quite I ... , and changed it to use IX+d instead so in two ...

... br /> [code]
... ; set up registers or C stack frame
IX,nn" opcode
uchar res2 ... ld hl,graphic_address
ld ix,graphic_address_char_to_left_of_this_one
call sprite_draw_function ; ...

... :

ld ix,0
add ix,sp ; ix = bottom of stack ... frame
ld e,(ix+2 ... />
If the initialization of ix is done once, only the ... .

Using the index registers is very, very slow however ...

... alternative set of general purpose registers. I don't know how ... of registers: AF,BC,DE,HL,AF',BC',DE',HL',IX,IY ... work with both sets of registers, they work with current set ...

... problems with small number of registers and managing it costs more ... using a small number of registers, after coding 5 Gameboy ... where you have No IX or IY Registers, No Alternate Register set ... around problems rather than chuck registers at them.

...

... certain address given in de registers (IX= at, DE=length).

... and LoReg for all common registers:
//AF,AF',HL,HL ... ',DE,DE',BC,BC',IX and IY

I ... that ten separate 16 bit registers that are apparently stored in ...

... />
On entry, it sets IX, DE, A and the carry ... RAM page, resets the necessary registers, then jumps to 0x05CA ("LD ...

... />
On entry, it sets IX, DE, A and the carry ... RAM page, resets the necessary registers, then jumps to 0x05CA ("LD ...

... Loaders, that used the IX and IY registers and displayed a countdown ...

... them to 65280, set the registers and interrupt state before doing ... 0DDh,33,0,0 ; ld ix,0
reg_iy db 0FDh ...

... up all the registers and had to use IX and IY, meaning ...

... up all the registers and had to use IX and IY, meaning ...

... up all the registers and had to use IX and IY, meaning ... think only IY and not IX needs protecting and that is ...

... />


; > IX = Return address
; >'HL ... nz,rbyte

jp (ix) ; Return


; ... .


; > IX = Return address
; >'HL ...

... 0DDh,33,0,0 ; ld ix,0
reg_iy db 0FDh ... ,0,0,0,0,0 ; Registers
[/code]



; > SP = Pointer to registers HL and BC
; > ...

... 0DDh,33,0,0 ; ld ix,0
reg_iy db 0FDh ... ,0,0,0,0,0 ; Registers (16 BYTES)