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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…
... outputs are mapped to bits of the AY chip's GPIO port ... (the other four bits are connected ... -
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…
... bit and store it to register c in 31 t-states ... code we can read eight bits with almost no loss of ... -
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…
... 128K which uses the AY. (Does the AY at least get rid ... /> the difference between if1 and ay seems only few lines of ... writing and reading correct 4 bits (RX,TX,CTS and RTS ... -
So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…
... 't mess with the IY register):
[code] 48 Basic ... a Melodik if you want AY.
On the other ... -
DivIDE questionsHi All, I'm the proud owner of two DivIDE interfaces, that I have just "inherited" from a friend. One of them is the original one and the other one …
... the bottom 8 bits, corresponding to the C register which INI leaves ... -
DivIDE questionsHi All, I'm the proud owner of two DivIDE interfaces, that I have just "inherited" from a friend. One of them is the original one and the other one …
... the bottom 8 bits, corresponding to the C register which INI leaves ... -
Load! Screen$ questionI've got a basic program listing in BASIN which among other things recalls a screen via Load! (I've Save!'ed a screen into memory before hand). How d…
... by injecting basin's cpu/ay registers into snapshot file.
6. from Tape Creator, select Save As.. and create a ... -
And 255I've had a good think and I'm pretty certain of this: Surely, surely there can't be a use for this command: 'AND 255'. Please tell me I'm right! (…
... are encoded, three bits indicate the source register and another three the ... -
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…
... interesting) is actually for an AY clocked at 3.25Mhz/2 ... (chanc + chp_ornptr), hl
; select AY tone table
xor a ... -
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,…
... 16K images, which I can select using three jumpers. Position 000 ... (hopefully) fixed version of the "Register retriever ROM" (to give it ... s easier to get the register values preserved during a reset ... the clock) would preserve all register values except IR and PC ... -
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,…
... />
Sometimes (Zilog) The I register keeps its value as well ... the last value of DE register, that is, 4444h.
select a 16K BASIC ROM. This ... -
Japan Tsunami AppealAs some of you will be aware, I've been tinkering with an open source version of SE Basic that could be distributed with hardware without infringing …
... wise, I mean) without nicking bits of Amstrad-owned code?[/QUOTE ... for the plus 3 to select roms should there be a ... -
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…
... from any pair of added bits, because their sum can never ... the current value of A register from 0 and stores the ... -
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? …
... /> [*]Be able to select and copy anything (including register values) in the ... also be nice if the register pairs had additional formats shown ... -
Stuck: Multipying 15 by 32 using RRCA in A reg[deleted]
... =JimTheBrit;549717]Take the A register. Put in 15 and multiply ... RRCA. What will the eight bits and the carry hold for ... -
Stuck: Multipying 15 by 32 using RRCA in A reg[deleted]
... the accumulator "wraps around", ie bits rotated off one end automatically ... need to mask off the bits you don't want for ... need to put the three bits you shifted off the right ... of your destination register pair, and the remaining five bits into the ... -
Desktop Spectrum Arcade MachineI have started a project to build a mini arcade machine dedicated to spectrum The plan is to build a small arcade cabinet no bigger than 15" high an…
... player buttons and a start / select / enter button. Two speakers mounted ... 2 gig Ram. Centre White bits are the button mounts and ... made from scrap and spare bits I had hanging around. If ... gone and bought the best bits for the job i.e ... -
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…
... part of it (so the register that forms the upper half ... border color (three least significant bits). So, when I write to ... -
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? …
... they would use the R register, which is changing so quickly ... FUSE, so that when you select Game Loader (as opposed to ... -
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…
... file the value of PC register is not among the data ... a "POP PC". The PC register is pushed onto the stack ... of two bytes of BC register represents the value of C ... on undocumented flag behaviour (flag bits 3 and 5). If you ... -
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…
[QUOTE]
Would I be right in assuming that your HALT emulation simply increments T_states by 4 and leaves PC untouched?
[/QUOTE]
Yes, that's exactly what it does. Let's get to port reading and keyboard handling. Here's port reading (all IN ... -
Howto play the AY files in the Spectrum +3 ?I have read that is possible to play the AY files in the real spectrum 128 hardware. Can someone to explain how to do it ? thx in advance
... facinating to cull bits of speech and other AY effects from games ... of there, along with the AY data from the .TAP...
Amstrad anyone ?I grew with C64 and Speccy, and still use both, but I`m curious about the Amstrad CPC464. So, comparing it to the spectrum only, what is it like ? …
... was the most powerful 8 bits computer commercially successful. Then the ... .
It has an AY, uses its IO ports to ...Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…
... 191 ; mask off the 5 bits I want
[/code]
bits I want
[/code]
register anyway in order to check ... move a into a differnet register whilst doing the bc zero ...Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…
... 191 ; mask off the 5 bits I want
[/code]
bits I want
[/code][/QUOTE ... you are overwriting your 'a' register anyway in order to check ... move a into a differnet register whilst doing the bc zero ...
