-
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…
... program's stack include initial register values and PC).
... an array of 8-bit processors of which the ... /> [/quote]
bit 7 of R is never altered by ... lower 7 bits of R could affect dram refresh ... in context switch is too high or not.
Help?Hi All, I wonder if anyone has a few minutes to look at this bit of code I'm working on. I'm trying to move to sprites and want to do it with a scr…
[QUOTE=R-Tape;506899]Aaaaah!
... 255 through the L register and starting again, ... actual register) which was getting incremented and the high byte ... original code the HL register pair contained the ... instruction is an 8-bit instruction which just increments ...Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
I did try a register rotate program as it seemed ... program. Maybe leave masks and bit shifting for another time, it ... nc,mpr
ld a,r
cp 20
... +1) ;point hl at them, high byte first
ld l ... 1) ;point hl at them, high byte first
ld l ...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…
... addressed by 8-bit or 16-bit numbers? Right now ... so, for example IN r,(C) reads from port ... of it (so the register that forms the upper half ... low part and different high parts are just aliases ... well (different values of high byte identify different half rows ...ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... mode)
;correct register R value for all snapshots
bit D2 with IFF2 state ... always compressed data/ignore bit D5 of +12th ... always compressed data/ignore bit D5 of +12th ... corresponding ram blocks copied to high 16kB
;add ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... equ 256-.one_pulse_max
;; REGISTER ALLOCATION
;;
;; B ... high edge
.low_edge:
or 8 ; set bit ...
defb 26 ; "R Tape loading error"[/CODE]
Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
[B][U]SET (BIT),r[/U][/B]
Realy ... work..
Manipulate bit 0 on Register C:
First ... />
Next set the bit 0 or register C.
Return ... a full 16 bit value from BC (useing just high byte diddling ...Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
[B][U]RES (BIT),r[/U][/B]
[I]“ ... low/high order)
SET 0,C ; Set bit 0, Register C
high order)
RES 0,C ; Re-set bit 0, Register C ... low/high order)
SET 0,C ; Set bit 0, Register C
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... pointers
exx ; alternate register set
pop hl ; ... fmove ; b(r), b(r)
fgt 0 ; b(r), b(r), 2 * ... rla ; reset
ccf ; bit 7 of second byte
high byte of length
dec ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ld d, e ; set high byte of top of RAM ... call line_scan ; check syntax
bit 7, (iy + _err_nr) ; ... ; work space
defb 'R' ; channel
defw x80_fdel ... print_a_2:
exx ; alternate register set
push hl ; ...IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…
... OUT instructions. And the high memory area was not ... system used an 8 bit address. So the Z80 ... ports using an 8 bit address. In practice though ... programmer can specify a 16 bit address :-). Sinclair Research ...
OUT (C),r - where r is register A, B, C, D ...Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…
... whether it's transiting to high or low?[/quote]
... clever. You preload the register that you wish to ... So you then simply RL r, and the current value ... gets pushed into your chosen register. Since it’s preloaded ... kind of fun, if a bit useless, nowadays. I’ve ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ~2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed
register was from here
; ... beginning of the line)
; \r #03 using "HOME" for this ... /> ld c, HOME
cp 'r'
jr z, .unescapewithC
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ~2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed
register was from here
; ... beginning of the line)
; \r #03 using "HOME" for this ... /> ld c, HOME
cp 'r'
jr z, .unescapewithC
Forever 2002 - crossplattform 8 bit party - the 3rd editionThe new year - a year of anniversaries for all 3 major 8 bit plattforms has started. ZX spectrum & C64 are 20 years old & Atari is celebrating 30 ani…
... for all 3 major 8 bit
plattforms has started. ZX ... edition of the Forever 8-bit party held on 15.-17 ... [/url]. Don't forget to register in
visitors&contributors ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... A,I or LD A,R (which copy IFF2 to ... then treated as a 16 bit word (LSB of course) ... /> * M5: 3 tstates: read high byte and jump to interrupt ... /> * M2: 3 tstates: write high byte and decrement SP.
* M3: 4 tstates: read high byte of 'nnnn' and decrement ...IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…
... (and only if) bit 7 of the high byte of the address ... is 0 then bit 6 ... no tape playing, 1 for high).
The original ... the opening copyright text until bit 6 of result is ... something about OUT FE affected bit 6, is this what ...R: Tape Loading Error on an EMULATOR??I was just trying to load 'Stop The Express' (a TAP file on a WOS Cdrom) on to a Mac OS X 10.4.6. TAPs (in OS X, I don't have Classic installed) AF…
... 2nd block loading i get 'R: Tape Loading Error'!
bit-too-far-recreate-the-old ...which domain to register?I'm about to register a domain under my country's top domain. almost all of the keywords are available to buy and I'm a bit indecisive person. which…
I'm about to register a domain under my country' ... buy and I'm a bit indecisive person.
which ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... />
ld (hl),b ; high byte of the output routine ... />
ld (hl),b ; high byte of the input routine ... P' ; channel type; 'K', 'S', 'R' or 'P'
; ... /> ld (hl),d ; the high byte of the offset
bit 3-4
ld d,a ; store high byte ...8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…
... create a union to access register pairs singularly everything has to ... done either as 8-bit or 16-bit, with conversions where required ... obviously be left as 16-bit, but what about the others ... ? Will more 8-bit operations be performed than 16 ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... bus must be loaded a bit by the ULA, which ... mode register, address 1 and 2 are the high and ... ), A to set a register, or to copy a buffer ... single instruction for an 8 bit register.
Bus indirect ... will also need a register access will require three I ...Adventures in Programmable Logic Part 2So, now armed with an Xilinx Parallel III cable, an XC9536 CPLD, a breakout board with power, a JTAG pin header and a 44-pin PLCC socket, I could try…
... to make a simple 16 bit preloadable counter, of the ... A1 lines to select the register or function, a CS ... high 8 bits of the counter, and a 16 bit ... hideous proprietary kernel module... a bit of a WTF - you ... br />
The second bit of trouble happened when I ..."Floating" AY registersWhile I was working on some AY sample-related stuff, it occurred to me that with the AY port not being completely decoded, it would be a handy CPU-ti…
... top 4 bits of the register number.
Unfortunately, it ... />
[i]Selecting an unused register number above 0x0f puts the ... this, sort of...
[quote]...high order address bits DA7-DA4 ... mask-programmed to any 4-bit code by a special order ...Another idea: 3D models from your favourite Speccy games[FONT=Times New Roman][SIZE=3]Take a look at this.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3][URL]http://www.shapeways.com/[/URL][/SIZE][/FONT] …
... near me at the Philips High Tech Campus in Eindhoven. They ... and were featured in The Register:[/SIZE][/FONT]
[FONT ... ; Starstrike etc. However, with a bit more work it should be ...R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... rubber key (issue 4) machine bit the dust the other day ... (but letters and words a bit garbled) i.e. 192 Sinclair ... Res?arch r$...
The ULA gets very ...R-TypeTell ya what, R-Type was an amazing bit of programming. Just re-watched the rzx of it. Stunning.:-o
Tell ya what, R-Type was an amazing bit of programming. Just re-watched the rzx of it. Stunning.:-o
