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Completely free games?Hi, I would like to know if there are any open source or completely free games for ZX Spectrum. Or at least some other free programs without any lin…
... after the last round of personal attacks I put all of my existing ... I wrote ever again*. Of course stuff already covered by ... Demo
Unfortunately none of the above titles are games ... source commercial software and not available from the WoS archive. -
SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…
... CSS regular). It had 280K of RAM and could run all existing ... of John Grant and Andrew Wright became fully open source. Last ... December I released SE Basic IV, the first 32K version of ... specification for a production version of the Spectrum SE). ROM- ... -
Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…
... as the machine has static RAM.
It's 16K ... only use a limited subset of the available bit patterns with dynamic RAM. -
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…
... set low byte of DE
dec e ; to top of RAM
... , frames ; L addresses low byte of frames
inc (hl) ... inc l ; L addresses middle byte of frames
inc (hl) ... inc l ; L addresses high byte of frames
inc (hl) ... -
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 a, (de) ; first byte of
or (hl) ; both ... second
inc hl ; byte of
inc hl ; second ... br /> ld d, a ; last byte to D
exx ; swap ... br /> dec hl ; first byte of result
jr oflow_clr ; ... -
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…
... nc, report_c ; error if out of range
add a, ... (iy + _flags) ; set bit 6 of flags
jr nz, s_loop ... s_stk_lst:
push de ; stack last values
call syntax_z ; checking ...
; THE TABLE OF OPERATORS
org 0x2795
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…
... bc ; stack discriminator byte
call next_one ; start of next variable
dec hl ; point to last byte
call make_room ; insert space ... until done
ret ; end of subroutine
; THE 'ALPHANUM ...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…
... call stk_pntrs ; HL to last value on calculator stack
call find_int2 ; last value to BC
in ... ld (de), a ; zero high byte of length
dec de ; ... ld (de), a ; zero low byte of length
inc de ; ...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…
... calculator
fdel ; remove last item
fce ; exit ... 0
fdel ; remove last item
fxch ; l ... inc hl ; most significant byte of line number
ld ... 0
fdel ; remove last item
fce ; ...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 (hl), ctrl_enter ; set last location to carriage return
byte of x-ptr
ld ... high byte of output routine
inc hl ; low byte of input ... routine
inc hl ; high byte of input ...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 h, a ; high byte of pixel address to H
call fp_to_a ; last value to A
... calculator
fdel ; remove last item
fce ; exit ... calculator
fdel ; remove last
fdel ; two items ...z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
... assembly it says 'unexpected end of file'
[/quote]
of a number of ready threads is ... I did one in the last post, which I will ... /> And stick the address of this subroutine into that 'wpoke ... those at the top of RAM 0xd1ed to 0xffff. I ...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 a, (hl) ; most significant byte of line number to A
byte of addressed number to A
last character
jr next_o_5 ; immediate ... bc ; point to first byte of next item
pop ...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…
... points to the location of the first byte of char data in FONT_1 ... %00001111 ; ROM 0, VRAM 1, RAM 7
out (c), a ... %00001000 ; ROM 0, VRAM 1, RAM 0
out (c), a ...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…
... a, h ; high byte of destination address
... bit 7, (hl) ; last character?
inc hl ...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…
... ; ROM 0, VRAM 1, RAM 7
out (c), ... ; ROM 0, VRAM 1, RAM 0
out (c), ... hl), b ; clear pixel byte of first character
inc de ...eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …
... />
The concern of overheating of the ULA and damaging is ... pages discuss a range of options available for creating the necessary ... which resulted in insufficient amplitude of the control signal. More ... related to the discussion: RAM tester ROM has been just ...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…
... use. A full list of the
;; available themes is on the ... screen directly into the video RAM
ld ix,16384
SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... I now had this available from the intro code, ... 08 = $08
; 4: hi-byte = base address adjustment = (256-offset ... ld e,a ;E =lo-byte of screen address
ld ... ld d,a ;D =hi-byte of screen address
ld ( ...Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…
... a problem with interpretation of the '#' operator. In ... [/code]
The last load to A is just ... get the most significant byte of a negative number. ... ]
The last one uses new syntax. All ... load from memory instead of a load of constant.
...Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…
... a lot of users, but leaves out the last few ... specify masks for the last couple of layers to determine what ... proven and tested piece of silicon with well known ... costs at a fraction of that of a ULA/SCLD ... with higher level devices available than just NAND gates ...Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…
... piece of silicon whose function can be customized in the last ... control the size or placement of transistors, nor where signals ... about gate density, type of resources available and who does the ... chip to postpone the decision of what electrical connections are ...Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... is almost 2/3 of the available time in the frame ... screen at the begining of the frame to avoid ... look for that line instead of the bottom edge, giving ... . by checking the high byte of a given screen address. ... process each buffer in order of appearance so to speak. ...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…
... on these extra instructions being available on the Spectrum because ... Ultimate used them in some of their tape loaders.
... over 100 undocumented Z80 instructions available
EDIT: Note ... an assembler by putting the byte of the prefix in as a ...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…
... REM line has a 4-byte header plus the REM ... string array has a 6-byte header plus the text. ... will always appear as the last line in the program.< ... hold the hi-byte of the string length. All of the other ... draw your attention to the last sentence on page 222. ...IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…
... done using a trivial number of T-states.
[/ ... .91 cycles per video byte plus 105 cycles overhead ...
The number of sectors to be read by ... the other hand, the last sector doesn?t need to ... the unused rest of the last sector of every frame must ...Christmas tellywell it's almost over... used to be a big event back in the day.... how many re-runs of raiders of lost ark / star wars did we see as a kid ? that an…
... /> Sky finally shown the last episode of Moaning of Life so watched that ... day. Must admit a lot of it was such and such ... , now you are looking at available to buy usually within a ... few weeks of it finishing at the cinema ...Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
... just spotted that during my last post in this thread, I ... electrolytic capacitors of the same value. They are of course available from many ...128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…
... at the bottom of RAM in place of the normal screen ... actually show is independent of the memory paging bits, ... byte.
Another problem is that half of all of ... on the middle 16K of RAM to be operating at ... is that changing the RAM page is very quick ...Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…
... in the very first byte of upper RAM and sometimes that ... it detects all upper RAM is faulty). However, ... IC16 provides bit 1 of all upper RAM and your test ... 4164 or all of upper RAM with one of these: [URL ... a different ULA. Any of these problems suggest someone ...
