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IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... we don't take the jr nz branch, but we continue into ...A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
Z80AsmI've been using the Z80 PC Assembler 1.2 by Peter Hanratty and found that the RST 8 instruction assembles to 200. It should be 207. Ret Z is 200 wh…
... INC L
0008 2032 JR NZ,003CH ; (+32h)
000a ... INC L
000c 2032 JR NZ,0040H ; (+32h)
000e ... 0000H ; (-08h)
0008 20F6 JR NZ,0000H ; (-0ah)
000a ...Writing faster BASICIn terms of structuring BASIC programs, what are the best ways allocate variables, functions, arrays? Any tips. I remember INPUT mag had some suggest…
... offsets for relative jumps ie. jr nz,mainloop - this is something that ...Z80: ABS(HL) functionI must be very tired but I cannot get my head around whether this function provides a correct implementation of a ABS function for a signed 16-bit va…
... , l
or h
jr nz, loop
rst 0
ld l, a
ret nz
inc h
ret ...Clearing 22 lines of the screenHow do I go about clearing the top 22 lines of the screen and leave the bottom #0 area untouched? I have a routine to reset the attributes, but cant…
Clearing 22 lines of the screenHow do I go about clearing the top 22 lines of the screen and leave the bottom #0 area untouched? I have a routine to reset the attributes, but cant…
... D
DEC A
JR NZ, .loop
RET
; ... (18 ... ;
bit 4,h
jr z,.l1
ld a ... 6 32x8 character lines -
jr nz,.l0 ; until l=#C0
jr z,.l1 ; until h=#58 ...Clearing 22 lines of the screenHow do I go about clearing the top 22 lines of the screen and leave the bottom #0 area untouched? I have a routine to reset the attributes, but cant…
... have done one row
jr nz,loop2 ;repeat until the above ...
ld l,a
jr nz,loop3 ;if l doesn't ...
ld h,a
jr loop3[/CODE]
Sorry ...
