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Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …
... +3, which has slightly different decoding, and wasn't tested on ... . Not a problem on the +2A/+3 machines but try running ... -
Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …
... of values to port FD! If Partial Decoding is off then the ... 't work. With partial decoding on in 128k/+2 mode ... /> So Fairlight crashes without Partial Decoding but PitFighter crashes with Partial ... Decoding.
So which ... -
Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …
... +2A/+3. See the FAQ for details of how the port decoding ... -
Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …
... because I had disabled partial decoding to allow Pitfighter to run ... non +2A/+3 models.
Fairlight 128k *needs* partial decoding (every ... /> I've now set partial decoding on by default and if ... the Fairlight 128k TZX in +2A/+3 mode and it crashes ... -
Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…
[QUOTE=Woody;175128]blah[/QUOTE]
Here he is! :)
Edit:
Here's the other info: A bit quick otherwise it'd have been weekend.
table a1f6
========
(this will need relocating/updating ... -
Spectrum +3 Problem & A Modification IdeaThis is a dual post. And it's also my first post, so I apologise if I get stuff wrong lol. My mate bought a Spectrum +3. I'm unsure about how many d…
... "Uncommited Logic Array", although the +2a/3 has a "Gate Array ... ". Only source is a dead +2a/3. The PC doesn't ... (via tape and beeper), memory decoding etc
This thread ... -
Help hacking Split PersonalitiesI`ve been hacking away at Split Personalities for the purpose of putting new screens and graphics (items). The current screen is at 41187 and is 160…
... $4c, $78, $d8, $9d, $2a, $1b, $e0, $0b
defb ... , $c0, $75, $09, $d9, $fd, $df
defb $4e, $ec ... , $29, $ec, $21, $30, $fd, $0e
defb $3d, $0d ... , $18, $3d, $ec, $21, $fd, $8f
defb $b4, $ec ... $26, $ec, $0d, $47, $fd, $94, $5f, $ec
defb ... -
Beeper octave range...A dumb question, I know, but I've found two conflicting sources of information on the octave range of the Sinclair beeper. I suppose I'm being a lit…
Spectrum +2A/+3 only :p
[ ... /> ld a,#1F
out (#FD),a
FillRam: ld ... -
48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... 4) The +3 (and therefore +2A/B) modified the NMI routine ... that writes to port $FD is in trouble as that ... models (I think the +2A and +2B models are software ... />
11) The +3/+2A/B models have port $1FFD ... 128/+2 and +3/+2A machines. Annoyingly the syntax ... -
RAM paging and port usageDear users and developers, I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especially those a…
... paging.
[QUOTE]Spectrum +2A and +3:
if port ... 're ignoring port decoding again (note that the decoding of "port 0x7ffd ... 1 of "port 0x1ffd" (port decoding again), the TR-DOS ROM ... -
Frightmare rzxI have watched recording of Frightmare recently: [url]http://www.rzxarchive.co.uk/f/frightmare.rzx[/url] Do you also have the impression the the gu…
... , $ff, $0d, $1f, $15, $1a, $2a, $2b, $2c
9b4f: defb ... -
Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…
... /> [code]
F3 DI
2A 3D 5C LD HL,(5C3Dh ... /> F9 LD SP,HL
FD CB 01 A6 RES 4 ... -
ZX games for fixingExist any games/software which need fix any bugs ? - incorrect graphics - incorrect or bad keyboard controll - too fast games (need slow-down) - game…
... ?
This game crash on +2A machines. FAIRLIGHT 128 use uncomplette ... /> LD A,#13
OUT (#FD),A = OUT #13FD,#13 (work ... on ZX128, but on +2A is used writed value to ... fix this OUT commands for +2A, but game don't work ... fairlight on any ZX 128 /+2A -
ZX games for fixingExist any games/software which need fix any bugs ? - incorrect graphics - incorrect or bad keyboard controll - too fast games (need slow-down) - game…
... /> This game crash on +2A machines. FAIRLIGHT 128 use uncomplette ... LD A,#13
OUT (#FD),A = OUT #13FD,#13 ( ... on ZX128, but on +2A is used writed value to ... this OUT commands for +2A, but game don't ... fairlight on any ZX 128 /+2A[/QUOTE]
Ahhhhhh ... -
Is this worth a punt?[URL="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=370259701244&ssPageName=STRK:MEWAX:VRI"]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&it…
+2A is basicily a +3 in ... can plug in an Amstrad FD-1 drive in the back ... -
Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…
... will malloc FILE structs and FD structs directly.
sp1 ... 128k spectrums (except the +3/2A) can only bank ram into ... -
Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …
... , $38, $35, $32, $2F, $2C, $2A, $27, $25, $23, $21, $1F ... increased the range with an $fd as the lowest note, and ... , $38, $35, $32, $2F, $2D, $2A, $28, $25, $23, $21, $20 ... -
RFC: ZXI hardware interface standardisationReposted from c.s.s to reach a wider audience [QUOTE=Andrew Owen] You may have noticed that there are more people making add-ons for the Speccy than…
... possible, at least on pre +2A/+3 Spectrums, which have a ... vectorized interrupts?
- Port decoding. I'm assuming that ZXI ... devices will perform complete bus decoding, and will take into account ... -
DIVIDE games crashingMy DIVIDE arrived today complete with 512K CF Card, ready to go. First impressions, really good - simple file browser works fine & games load no prob…
... code LD A,#7F + OUT (#FD),A and similar variants. But ... port #7FFD on ZX128/+2/+2A/+3 and game crash or ... possibility load in ZX128/+2/+2A/+3 models but exist also ... -
DIVIDE games crashingMy DIVIDE arrived today complete with 512K CF Card, ready to go. First impressions, really good - simple file browser works fine & games load no prob…
... code LD A,#7F + OUT (#FD),A and similar variants. But ... port #7FFD on ZX128/+2/+2A/+3 and game crash or ... possibility load in ZX128/+2/+2A/+3 models but exist also ... -
Alien8 will not run on Divide?I can't seem to get Alien8 running on my 128+ with Divide. I have the original tape and have loaded into an emulator to create a snapshot, (.z80) an…
... code LD A,#7F + OUT (#FD),A and similar variants. But ... port #7FFD on ZX128/+2/+2A/+3 and game crash or ... possibility load in ZX128/+2/+2A/+3 models but exist also ... -
+2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …
... ld bc, $1ffd ; 5b0d 01 fd 1f $0ats
out (c ... ld bc, $7ffd ; 5b14 01 fd 7f $0ats
out (c ... ld bc, $1ffd ; f394 01 fd 1f $0ats
out (c ... ld bc, $7ffd ; f39b 01 fd 7f $0ats
out (c ... 2 and port $1ffd for +2A/+3 - nice description from ... -
Zombie Zombie Loading SchemeA quick check of the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0005866"]Zombie Zombie[/URL] loader identifies it's the RAPID LOADING SYS…
...
ld d, iyh ; 5d32 fd 54 $08ts
ld e ... , iyl ; 5d34 fd 5d $08ts
ld hl ...
defm " * ESPRIT" ; 5de4 20 2a 20 45 53 50 52 ... -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
... return value FF as ZX128+2A. Keyboard use same layout as ... these?)
[*]I/O ports decoding (ideally describing any [I]partial ... decoding[/I])
[*]I/O port [ ... -
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…
... x2 O TV * * * *
Spectrum +2A 1988 UK 3.5469 64K ... full lower-byte I/O decoding, and extended video modes.
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…
... , 0 minutes)
+3 Basic / +2A: 1562448 (8 hours, 40 minutes ... full lower byte I/O decoding so even if you use ... lazy decoding hardware with it (like the ...CrusoeI'm making slow progress in mapping & debugging this game, having to restart several times due to various unfortunate events. The latest was getting …
... dealing with the spiders, or decoding the messages found on bits ...
DJNZ $7AE7 ; 7AE8 10 FD
;[b][color=red ...NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…
...
It currently uses partial decoding for Kempston (xx0xxxx1) and Fuller ... perform a more issue-free decoding, if needed.
2A/+3, Sinclair and Protek ... inhibit normal keyboard function. +2A/+3 is incompatible with any ...Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
... ix, (l_f00c) ; f013 dd 2a 0c f0 $14ts
ld ... ix, (l_f00c) ; f08e dd 2a 0c f0 $14ts
l_f092 ... : ld hl, (l_f002) ; f0be 2a 02 f0 $10ts
ld ... jr nz, l_f0f0 ; f0f1 20 fd $07/$0cts
l_f0f3: ... : ld hl, (l_f00e) ; f139 2a 0e f0 $10ts
ld ...
