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Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... 0DDh,33,0,0 ; ld ix,0
reg_iy db ... ,0,0,0,0,0 ; Registers (12 BYTES)
... the number of the stacked registers... I was really tired ... to restore the game registers and interrupt mode as ... /> mov cx,[ebp+SNA_ix] ; IX
mov dx,[ebp+SNA_iy ... -
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... 0DDh,33,0,0 ; ld ix,0
reg_iy db 0FDh ... db 0,0,0,0 ; Registers (4 BYTES)
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... 0DDh,33,0,0 ; ld ix,0
reg_iy db 0FDh ... db 0,0,0,0 ; Registers (4 BYTES)
A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…
... . One normally would use two registers to acomplish this: one to ... I analyze in my article, (IX) holds both the data that ...Converting TRD-Dos into TapHello, there are still many programs appearing on TRD-Dos or SCL format and users of normal Spectrum cannot run them. Of course I know about emulator…
... the BC, DE and HL registers for each one (Hikaru's ... /> [code]PUSH HL
POP IX
LD A,FF
yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... of exx and ix to keep all values in registers. sdcc has ...Fuse: what do you want to see?An open brainstorm. If you had a team of programmers working on [url=http://fuse-emulator.sf.net/]Fuse[/url], what would you tell them to work on? …
... the ability to select which registers to keep a track of ... ]PC instruction BC DE HL IX IY IR AF' BC' DE ...yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... z80 assemblers accept "ld (ix),0", this is actually shorthand ... for "ld (ix+0),0"; it looks harmless ... try not to use index registers. Having said that, sometimes you ... as function pointers (the "jp (ix)" instruction takes 8 cycles), slow ...Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... ' to get at all the registers. But then the full scope ... of registers is required if you want ... subject of all registers, let's not neglect IX and IY. You ... can actually do LD (NN),IX as quick as you can ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... aren't enough registers left. I could use IX and IY, but ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... ;523068]Are you sure that IX/IY would slow everything down ... delay to use the IX and IY registers, then that extends to ... not be many uses of IX or IY on a line ... , but then with all the registers occupied cacheing graphics (except maybe ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... total) are loaded into the registers AF, BC, DE and ... more bytes in other registers like AF' and IX, and to PUSH ... memory works, the PUSH IX instruction can take up to ... bytes of data in the registers in preparation for rendering ... couple of the slower registers.50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... is always the the alternate registers which hold the graphics and ... hold the loop counters etc. IX points to the graphics for ... to tell it to use IX instead of IY.RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... I think that not all registers inside the CPU are modified ... that at power on, all registers contain $FF (or whatever value ... flipflops that forms the internal registers), then the RC circuit pulls ... showed the copyright message, the IX register keeps the value I ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... maybe short enough) reset pulse, registers values are preserved. Nevertheless, both ... /sgs_z8400ab1_warm_start_banks_changed.jpg[/img]
- Registers IX and IY commonly hold their ... confuse the results obtained (registers with different values as expected ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... -flop, clears the PC and Registers I and R, and sets ... -byte opcodes (such as PUSH IX) are executed as well.
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... is treated as 2 separate registers and not a 16 bit ... it's High Low.
IX and IY are both Low ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
Problems chase problems. Call me dumb, but something's wrong with loading snapshots (.SNA files). I found and tried to load four games: Jetpac, Atic Atac, Manic Miner and Jetc Set Willy. Here are the results:
-for Jetpac and Atic Atac loading ...AY Magic version for ZX81 was bornModified Ay magic ,my previous interface for zx48. On board, ay chip based on Zonx interface but with stereo output and rampack 16 or 32 kilo on boa…
... times there are no spare registers to use. but i managed ... />
Third change all IX to IY, IX is used by zx81 ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... such possibility in case of IX/IY, but definitely not in ... to secure all 16-bit registers for which I haven't ...Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... while altering the two index registers. I presume that it's ... DI ; 8018 F3
LD IX, $4000 ; 8019 DD 21 00 ... HL ; 8041 EB
INC IX ; 8042 DD 23
INC ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... say SP=16385 and PUSH IX is about to be executed ... . So, would only half of IX be placed on a stack ... flags, loading memory values into registers, etc...) will be done.Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... no 16bit load/store instructions. IX and IY are really slow ... will see you loading 8bit registers. Indexed registers are a good choice ... will be quicker than using IX (13 instead of 19 TStates ... table pointer advances, whereas using IX keeps it constant.
< ...Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... no 16bit load/store instructions. IX and IY are really slow ... will see you loading 8bit registers. Indexed registers are a good choice ... will be quicker than using IX (13 instead of 19 TStates ...Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... it's any different to IX. Confused. [/QUOTE]
registers are used by it but ...
