-
Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... am thinking some form of Z80 aware IDE that allows code ... through code, set breakpoints, examine registers, flags and memory contents.
Z80? Sort of a BasinC for ... Z80 would be perfect! :-)
... -
Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…
... particular letters and combinations of 'registers' you have to use, and ... the absolute fastest way the Z80 processor can do it, but ... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... /> 1) Ability to seamlessly edit Z80 .bin file (automatic disassembly, "editing ... additional features such as "unused registers", ...)
5) Refactoring (select code ... -
The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... (data)
[b]- get registers...returns the contents of all ... file (.IHX, .BIN, .Z80) and your .CDB file to ... would now save all registers. It would then send ... C source code and Z80 asm code. You could ... would issue get all registers command and display them ... -
Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…
... LD (IX+04h),&C3 ; Z80 opcode for JP
LD ... /> LD (IX+0Fh),&18 ; Z80 Opcode for JR
LD ... br /> PUSH AF ; Preserve all registers
PUSH BC
PUSH ... br /> POP IY ; Restore all registers
POP HL
... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
While processing an instruction, the Z80 automatically outputs the contents of ... R register and the I registers to the address bus, to ... to A15. Every instruction, the Z80 increments the value held in ... -
Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …
... "]has already implemented it for Z80[/url] using look up table ... , but for the 8-bit z80 with generalized bit shifts, I ... a BCD conversion using only registers. The register sequence is reversed ... -
ZX GameDev tools consolidatedHello WoS! It's been a while, yet with a plenty of decent gamedev tools (including new ones!), is there a [i]single/pivot table[/i] or some datash…
... 't use such and such registers (SP? IY?), enable or disable ... a few commands like regular Z80 operations on variables from a ... -
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…
... the Z80. It had (I recall) one accumulator and two index registers ... , and a weaker instruction set. The Z80 had 8 ... - and 16-bit registers and a better ... Brattel).
But the Z80 had better stack handling. The ... -
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…
... clearly slower than either the z80 or 6809.
... time. So in the marketplace, z80 relative performance rose in comparison ... current manufacturing technology. So a z80 made in 1976 was 4MHz ... of the same 8-bit registers A through L and 16 ... -
The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …
... etc. instructions. Naming of 8080 registers was alphabetical with HL showing ... registers in the 8080. However, I’m talking specifically about the Z80 ... ’s mouth (the [i]Z80 CPU User Manual[/i] by ... designing new instructions for the Z80. (And who knows, maybe ... -
Copying a single character from one place to another?[code] ORG 33000 LD A,8 LD HL,16384 LD BC,256 LD DE, 18432 LOOP: PUSH AF LD A,(HL) LD (DE),A ADD HL, BC POP AF DEC A JR NZ,LOOP REST […
... ’t apply to 8-bit registers in this case. So, while ... /> I recommend you study a Z80 instruction reference and/or use ... -
z80 Helper?When you are programming with z80 do you get 'lost' you are in the middle of making a routine and you can't remember which registers are holding val…
... there be features in a z80 editor that would help?
z80 subroutine by itself,
it could see registers being ... -
ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next
... ="mik3d3nch;906061"]What makes the Z80 such a successful design of ... machines, cash registers, you name it. In addition, the Z80 assembly, while ... -
ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next
... from basic and memory mapped registers (at that time). On ... this is offloaded from the z80. It's a similar ... part of webpages on the z80 side.
The ... weighty coprocessor and the z80 side as more of ... be controlled from the z80 side via port or ... -
ZXBaremulator 35th anniversary editionHi, to celebrate the 35th Spectrum anniversary, I've released the first complete Spectrum 48K bare-metal emulator for Raspberry PI. It's available…
... breakpoint, jump to address, read registers, write registers, read byte block, and ... network server. And then when Z80 would reach that address it ... current value of all registers, set value of registers, and jump to ... -
ZXBaremulator 35th anniversary editionHi, to celebrate the 35th Spectrum anniversary, I've released the first complete Spectrum 48K bare-metal emulator for Raspberry PI. It's available…
... breakpoint, jump to address, read registers, write registers, read byte block, and ... network server. And then when Z80 would reach that address it ... current value of all registers, set value of registers, and jump to ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... .
5) 8266 will freeze Z80 and write contents of ROM ... ) and
7) Reset the Z80.
Because I don ... 'll use three intermediate shift registers to prepare RAM contents in ... to trigger transfer from shift registers to RAM, address by address ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... the possibilities of hooking into Z80 memory reads and writes.
registers". When one writes to them ... -
are there any machine code to basic converters?i know it sounds stupid but for amature programmers like me it would be great. i could speed up the basic on an emulator and it would give me more of…
... very direct conversion where assembler registers would be Basic variables so ... program which read codes of Z80 instructions and translate them to ... -
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…
... CPC Firmware reserves the alternate registers for the OS, which is ... going to want all those registers for there own usage, ... a different matter if the registers automatically switched on interrupt (along ... in that sense, since the Z80 wasn't micro-coded. The ... -
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…
... forget Zilog designed the Z80 with the idea that ... the 8080 which the z80 was aiming to replace. ... the failure rate. The z80 was a large die ... />
There are z80-derived architectures that do allow ... flexible use of the exx registers. The Rabbit series, eg ... -
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…
... br /> exx ; Switch to normal registers
; ------------------------------------------------------------------------------
ld ... just be my lack of Z80/Aseembler knowledge.
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…
... or am I missing a Z80 trick?
[code ...
pop hl ; Restore HL registers
ret ; No, key was ...ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... even if there is no Z80 CPU fitted)
[*]Provide the ... /output) ports, that is the registers for the border colour, the ... that we know that the Z80 has a clock and is ...How do I convert a .z80 snapshot to a tape file?I've been fiddling with this for a while but can't get it to work reliably. I use Marvin to write short BASIC and assembly programs that uses .z80 in…
I guess that most Z80 -> TAP converters will do ... the screen (to store CPU registers), and they will save everything ...Hacking the ZX Spectrum 48K ROMHi Guys, I have modded my Speccy with a dual boot ROM loading on first bank the original ZX kernel and on the second bank an enhanced version. I h…
... used 6502. In some respects Z80 has a very different feel ... it's got far more registers and far less addressing modes ...Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... running out of registers I mean -- not enough registers for reasonably fast ... /libsrc/_DEVELOPMENT/font/fzx/zx/z80/asm_fzx_putc.asm"]here[/url] and ... it can work for any z80 machine as long as someone ...ZEsarUX-7.0Hi! I have uploaded a new ZEsarUX stable version :) This is ZEsarUX 7.0 There are a lot of new features added, more than ever! You can downl…
... =`pwd`
ZESARUXLOCATION=~/Applications/Z80\ Emulation/ZEsarUX/zesarux.app/Contents ...
