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Distinguishing between models?I'm running the risk of being pointed to the faq here, so sorry in advance. Something I'm trying out requires that the program can distinguish betwe…
... (slow = ZX128/+2, fast = ZX+2A/+3)[/quote]
At ... to use the different partial decoding of "port 0x7ffd" rather than ... -
Arkanoid - Hit Squad ReleaseInfoseek (and the [URL="ftp://ftp.worldofspectrum.org/pub/sinclair/games/a/Arkanoid(TheHitSquad).tzx.zip"]TZX[/URL] itself) identifies the Hit Squad …
... /> ld hl, ($0000) ; e559 2a 00 00
ld a ... ;
ld iy, $0000 ; ee44 fd 21 00 00
l_ee48 ...
inc iy ; ee4c fd 23
jr l_ee48 ; ... /> ld hl, ($0000) ; e0b2 2a 00 00
ld a ... (l_fd76), hl ; e913 22 76 fd
ld hl, $8000 ; ... -
New Game! Maritrini, Freelance Monster SlayerAfter experiencing the sweet taste of success, Maritrini woke up one fine day in a mess of bed sheets and with the biggest hangover she could remembe…
... been tested on a real +2A and it worked fine. Anyhow ... that.[/QUOTE]
The +2A/+3 models don't suffer ... : I see you've used FD, so beware when you switch ... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
[QUOTE=AndyC;608944]Well the +2A and +3 are immune to ... . The I is set to FD or FE, can't remember ... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... . The I is set to FD or FE, can't remember ... /> Dont worry, I have only +2A :D :D -
Internal ROM expansionHas anybody designed a multiple-ROM interface that plugs into the internal ROM socket instead of plugging onto the edge connector? It would be useful…
...
jp $182a ; 87c3 c3 2a 18 $0ats
jp $12fe ...
djnz l_82ea ; 82eb 10 fd $08/$0dts
ld de ... -
Amstrad FD1 and Spectrum 48/128Just throwing an idea out there thats probably impossible but could there ever be a way of connecting the two? You can with a +3 but what about the …
... many resources available for the FD-1! I always thought this ... you need the +3. :) The +2A and +2B can be converted ... be able to find an FD-1. -
The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…
... here. We use full port decoding (A5=A6=A7=0) instead ... slow/fast ram pages layout (+2A/ZX128 layout).
[/QUOTE]
The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…
... port table with ULA port decoding on russian clones:
[code]
PORT ADRESS DECODING
hex/dec A15 ... ... 3/+3 - ZX Spectrum +2a,+2b/+3 8 - Pentagon 128 ... (not confirm that the decoding for a computer #5( ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... even the +2, but the +2A and the +3 as I ... they would be. The port decoding is handled by the ASIC ...Fully-addressed devices initiative (FADI)I would like to introduce an initiative for those who create new pieces of hardware containing legacy devices with well-known addresses. It says that…
... IORQGE on 128K heatsink and +2A/+3 prior to use this ... direct link inside the text. +2A/+3 is not difficult, as ... /)/
Or more complex decoding:IOULA/=(A7 & A6/ & ...Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…
... models. I tried in my +2A and in the emulator, and ... , a problem with interrupts when decoding a level. Snaphots have been ...How to use +3 disks with other Spectrums?Or, in other words, was there ever an external +3DOS interface or complete drive kit, or is having actual Spectrum +3 the only way to run those disks?
... worked on the +2A/+2B because the address decoding for the floppy ...Sinclair +2a Why!?!One thing I've always wondered and whilst going though my collection today the question re-emerged in my mind. Why the Spectrum +2a? What I mean by …
... drive for "disk" CPCs (Amstrad FD-1).
Also ... were two kinds of Spectrum +2A, one kind (re)used ... for Spectrums. The Amstrad FD-1 would work as a ... modified) as a drive for +2A computers [b]after[/b] ... be able to connect the FD-1.
But... ...Sinclair +2a Why!?!One thing I've always wondered and whilst going though my collection today the question re-emerged in my mind. Why the Spectrum +2a? What I mean by …
... would allow to convert a +2A into a +3 (and then ... connect one of those FD-1).[/QUOTE]
Note ...Sinclair +2a Why!?!One thing I've always wondered and whilst going though my collection today the question re-emerged in my mind. Why the Spectrum +2a? What I mean by …
... for Spectrums. The Amstrad FD-1 would work as a ... modified) as a drive for +2A computers [B]after[/B] installing ... got a "cut-down" +2A board, you've got no ... be able to connect the FD-1.[/QUOTE]
... drive itself was always an FD-1 (DDI = Disc Drive ...DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... =Black_Cat;715078][code]PORT ADRESS DECODING
hex/dec A15 ... A0 ... , only with different port. On +2A or +3 models can be ...Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
...
0A 8A 4A CA 2A AA 6A EA 1A 9A ... 5D DD 3D BD 7D FD
03 83 43 C3 ...New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
... a fourth joystick on a +2A? i.e. Sinclair #1, Sinclair ... ) joystick interface (which use partial decoding) and swap address lines A0 ... can be read on a +2A / +3. So my suggestion would ...New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
... a fourth joystick on a +2A? i.e. Sinclair #1, Sinclair ... ) joystick interface (which use partial decoding) and swap address lines A0 ... can be read on a +2A / +3. So my suggestion would ...Quick fix for four joysticksHere's a quick modification to add four joysticks to any Speccy. This assumes you already have two Sinclair ports. [URL="http://joefish.co.uk/specc…
... from port #FE - on a +2A or a +3 it doesn ... 48K, but not on my +2A. The only way round that ... . Or if you're fully decoding all 16 bits, you could ...ZX Spectrum +2A and +2B - finding the true factsI'm confused. Some told me that a +2A has a +3 board, and the +2B got the simplified board. But I think that is not true. I have had over a dozen b…
... too, have had several +2A machines, they all had the ... colour as the "proper" +2A case, and the moulding of ... +3 PCB in a +2A case, but it would explain ... an external drive, called the FD-1, although it was ... series also worked with the +2A. That may be worth ...ZX Spectrum +2A and +2B - finding the true factsI'm confused. Some told me that a +2A has a +3 board, and the +2B got the simplified board. But I think that is not true. I have had over a dozen b…
... floppy interface for the +2A called the Amstrad SI-1 ... according to the +2A manual:
[ ... to the +2A, you should use the model AMSTRAD FD-1 drive ... the +2A, and will support up to two FD-1 drives ... to add externally on a +2A or +2B.
...harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…
... />
The trouble is, the decoding of what is an instruction ... />
ROM is as per +2A/+2b/+3, TWO 32K ROM ...Using even ports for input?I've been looking for unused ports to use with my clashbasher interface. I understand that the spectrum only considers A0 when decoding its input p…
You can always hold the IORQGE line high which will prevent the ULA from decoding even ports. (I think IORQGE isn't present on the +2A/+3 though).Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... my +2A Speccy.
I finally understand the decoding chip (from ... chip (they are not the decoding value). Where the A5-A7 ... . So, for middlingly crude address decoding I could connect A3, A5 ...
