-
mirroring bitsIf I have a string of 1408 bytes, each of which has one bit 'b' set, what's the shortest way of mirroring that string, so that each bit set at positi…
... ,80
cpl ; -> fe,fd,fb,f7,ef,df,bf ... ; -> 32,31,30,2b,2a,22,12,42
sub ... -
JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... fundamentally different to DD/FD prefix. DD/FD sets an internal bit ... the ED prefix, DD and FD will still set the same ... will either be ignored when decoding ED opcodes or cleared by ... the action of DD and FD. For some reason, my guess ... -
Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... not work with a Spectrum +2A, +2B, +3. That's the ... interface to do the necessary decoding.
But if you ... -
Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... not work with a Spectrum +2A, +2B, +3. That's the ... interface to do the necessary decoding.[/QUOTE]
Why do ... -
Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…
... , I'd recommend full port decoding if possible as we're ... this really helps for the +2A/+2B/+3 which cannot do ... the thousands upon thousands of +2A/+2B/+3 machines that still ... -
Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... should be used for port decoding.
[QUOTE]And things ... model and run properly on +2A/+3, too... OTOH, I guess ... -
Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... should be used for port decoding.[/quote]
The ports ... were chosen to allow partial decoding for Chris's plug-in ... plug-in version uses full decoding. There's no way to ... model and run properly on +2A/+3, too... OTOH, I guess ... -
ZXDS 1.3.0Hello, I am really glad I can announce one more [URL="http://zxds.raxoft.cz"]ZXDS release[/URL] on this special day. The major new feature is the lo…
... I started, too. The screen decoding required is much more complex ... ULA screen switching timing for +2A/+3 and improved Pentagon screen ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... , just identify 128/+2 or +2A/+3 from the paging model ... bear in mind the partial decoding of the paging port on ... -
Betadisk 128 in production.Pcb is in factory, i expect ready device in next 2 weeks. [URL=http://www.fotosik.pl/showFullSize.php?id=7b4cc1b97c1c4703][IMG]http://images52.fotos…
... used also USR 15616). On +2A/+3 is unusable.
-----------------
2A/+3 use two ROMOE signals ... . Beta128 also use original address decoding of port 7FFD as on ... incompatible with other ports on +2A/+3 (1FFD,FDD ports,etc ... -
ZXDS 1.3.0Hello, I am really glad I can announce one more [URL="http://zxds.raxoft.cz"]ZXDS release[/URL] on this special day. The major new feature is the lo…
... I started, too. The screen decoding required is much more complex ... ULA screen switching timing for +2A/+3 and improved Pentagon screen ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... changed to read from port #FD :(
Dont worry ... can play it in my +2A ;) -
Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…
... due to the +3 and +2A(black) will only read 12345 ... it’ll be like the +2A and +3. The SAM’s ... Kempston interface, I believe the decoding is ‒‒‒‒‒‒‒‒ / 000‒‒‒‒‒ but for the ... loose decoding, Fuse has ‒‒‒‒‒‒‒‒ / ‒‒0‒‒‒‒‒ . Did any ... -
Renegade by ImagineOn the speccy 128/+2 you got ingame music but not on the +2a/b/3 (paging issue?), although all the 128k's had music on the menu page. Was there ev…
... /> ld bc, $1ffd ; 7c06 01 fd 1f $0ats
ld hl ... there is a difference with +2A/+3 at address $2000 between ... -
Guide to the ZX Spectrum ports[B][COLOR="Red"]New![/COLOR][/B] BC Info Guide #4 "Guide to the ZX Spectrum ports" [url]http://zx.clan.su/forum/11-46-1[/url]
... do [xxxxxxxx-xx0xxxxx] decoding, not the 'official' decoding of [xxxxxxxx-000xxxxx]. Only ... the interface has the 'official' decoding. Those are the ones needed ... /discussion/43486/joystick-interfaces-on-2a/p1
And not ... -
Bored of the Rings coded messageI was browsing [url="https://tcrf.net/"]The Cutting Room Floor[/url] recently and stumbled upon the entry for [url="https://tcrf.net/Bored_of_the_Rin…
... have anything to do with decoding it:
[quote]
Hello ... ]20
D0 D4 7B 2A C8 A8 7B E2 CD ... -
Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…
... gate array chip does the decoding/encoding of the keyboard and ... /"]Schematics for the ZX Spectrum +2A/+3, +2B, and +3B here ... -
Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…
... gate array chip does the decoding/encoding of the keyboard and ... /"]Schematics for the ZX Spectrum +2A/+3, +2B, and +3B here ... with the equivalent from the +2A (the one with the dodgy ... -
c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... SpecEmu's debugger, and on +2a/+3, it switches from ROM3 ... /> ld a,#10
out (#fd),a
[/code]
From ... -
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... percent reliable detection of a +2A/+3 that [i]does not ... a,$0f
in a,($fd) ;read from port $ffd
2A/+3
[/code]
2A/+3. Follow the link in ... -
Dual joystick interface schematic?Hi! Would anyone have a schematic for a dual joystick interface? Cursor or sinclair would either work. If not, I might try my hand at designing one.…
... note that with a Spectrum +2A / +3, keypress type joystick interfaces ... lot of things by only decoding the top bit of the ... -
A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…
... as possible to a real +2A/+3. Then the game will ... it’s running on a +2A/+3 and then makes the ... if we're on a +2A/+3. If we're not ...
ld a,(2899) ;+2A/+3 ROMs return 126
port2 in a,($fd) ;[11]read port formed by ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... from unattached ports, whereas the +2A and +3 ASIC, when memory ... set in all cases. The +2A/+3 floating bytes will appear ... Centronics port decoding (0000 ---- ---- --0-). With paging disabled, the +2A/+3 will ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... ?
[quote]Centronics port decoding (0000 ---- ---- --0-).[/quote]
2A/+3 models is 7 contended ... -
MultiCart for TC2068I've got one Portuguese Timex Computer 2068, but built-in AY sound chip and joystick interface are not widely used on this machine. Also compatibilit…
... floating bus in +2A/B & +3 also, decoding of 1FFD port ... -
If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... ’ the ULA I/O address decoding (currently it ignores address lines ... the +3 and then the +2A / +2B. The custom gate array ... -
Two new spectrums arrived. One no video.Got a +2 and a Toastrack arrived today. Toastrack was actually in good condition, little wear, though a little dirty. Worked well on first power up, …
... /> I would look for a +2A, but I wanted the +3 ... I might throw in another decoding chip and a piggyback board ... -
Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... ED = ED or
DD FD = FD
Is also 1 byte ... [url="http://www.z80.info/decoding.htm"]Decoding the Z80[/url] page ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... , X, C, & V
; #FD - A, S, D, F, & ... or D?
ld a, #FD
in a, (#FE)
2A, #AA
border_botL db #55 ... , #00
border_botR db #AA, #2A, #EA, #0A, #FA, #02, #FE ...
