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Using +2B ROMs on a +2A motherboardHi I've recently acquired a +2A with an English keyboard, but Spanish system ROMs. I also have a faulty +2B, with a perfectly working set of Engli…
... /> I've recently acquired a +2A with an English keyboard, but ... +2B ROMs work in the +2A, or are there code differences ... -
Recapping parts list needed for +2a power supplyHello I've recently acquired a +2a power supply. It works, but given the age I'd like to do some preventative maintenance and refurbish it. Does a…
... /> I've recently acquired a +2a power supply. It works, but ... a replacement PSU for the +2a/+3 - or are they and ... -
Correct EPROMs for flashing +2a +2b +3 system ROMsHello I'm looking for some suitable EPROMs with which to create +3e ROMS to fit to some +2a, +2b and +3 machines. Would these ones be suitable …
zx spectrum +2A modulatorhi specy world , i recently sold a specy +2A with a modulator that looked different from the normal astec jobs .. it was VM-516/E36 b/wave inc taiwa…
... , i recently sold a specy +2A with a modulator that looked ...specie +2/+2A keyboard spring supplierscan i buy new keyboard springs for spectrum +2/+2A anywhere at a price that will not make me jump up and down like a spring ?? [url="https://phot…
... keyboard springs for spectrum +2/+2A anywhere at a price that ...Compatible With All ZX spectrums Except Spectrum +2A.This topic may well have been mentioned before but I could not find it mentioned anywhere after a quick look . I have just found a game called "Solar…
... With All Spectrums Except Spectrum +2A" . Well , in this particular case ... as well documented as being +2A incompatible as this one . Were ...zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…
... looing at a zx spectrum +2A power supply that the -12v ...Spectrum +2AHi. Which are the SD card options that work with the +2A? Will DivIde work? Any other options? Thanks.
Hi. Which are the SD card options that work with the +2A?
Will DivIde work? Any other options?
Thanks.+2A vs +2BFrom what I understand, the +2A like the one I have is black, while the +2B is grey. Logically, the +2B came after the +2A, but why is there a prefer…
From what I understand, the +2A like the one I have is black, while the +2B is grey. Logically, the +2B came after the +2A, but why is there a preference to the A model?
What are the differences?Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …
... the ULA on the address bus. In the course of my ... on Amstrad's black machines (+2A/+2B/+3/...) and on any ...Fire Ruby - More HelpI cant pass the spikes in the fire ruby by lawrence creighton, can someone please help? [ This Message was edited by: welsh_brawler on 2003-08-08 21…
... and pluck a{6}floating tumbler from the water. ... DESC
IN BUS AT 15
CARRIED 18 ... DESC
IN BUS PRESENT 31
NOTCARR 18 ...One Man And His DroidPosted a few days back about control probs with a few games, after a bit of getting used to what to look for controls-wise and all the .txt files und…
[quote]
On 2004-04-23 14:52, Arjun wrote:
:o Er... I'd rather not have any bus floating over port 31. It will scare the pants off the navy I tell you!
[/quote]
LOLInterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…
... z80 reads whatever is floating on the bus at the time, usually ... $ff was always on the bus when the z80 was looking ... , R reg) on the address bus and this fools the ula ...DivIDE interface help neededhave got my DivIDE interface, CF adapter and CF 1 gig card all linked up, on a +3 I get the DemFir intro screen, good! Problem is I get no screen wha…
... amstrad's unlucky design of +2a/+2b/+3 machines - they have ... device. ZX's reset is floating around, coz it's a ...What is an "Unknown Port"?Port FF is unknown and so can return screen data on a 48k/128k/+2 models. But what if no Kempston mouse is plugged in. Is Port DF classified as unkno…
On 48k/128k hardware (and +2) then a read from a port with no hardware attached returns a mixture of display/attr bytes and $FF, depending on what is on the bus at the time.
On +2a/+3/+3e hardware, it returns $FF every time.
D.Multiface QuestionsI have a Multifdace 128 connected to my Spectrum 128. I noticed the options bar come up without me pressing the red button while I was playing a game…
... are the +3 and the +2A (not the +2, which they ... different connections on the expansion bus.
Anyway, I used ...Opus Discovery and +2A?Can anyone tell me if the Opus Discovery is compatible with the +2A. I've just bought a +2A off Ebay and couldn't find any info on compatability. If…
... lines missing from the +2a/3 expansion bus that are available on ... (except MF3) fail on the 2a/3. Quirte why Sir Alan ...InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…
... often referred to as either "floating" or "tristated").
On ... puts an address on the bus. This logic looks at the ...Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
...
As a result, the +2A/+3 machine are already ahead ... see on the address bus whereas the +3 ULA ... address on the address bus but the MREQ control ... sitting on the address bus for those 5 remaining ... can cause contention. The +2A/+3 machines see the address ...+2B problem stillHi all, I have a spare +2B that still dont work. Richard kindly sent me 4 x 4464 ram chips but the +2B still dont work I have swapped over both ROM`s…
... chip, i.e. the Z80 bus comes in, multiplexed RAM busses ... one chip from a +3/+2a that I had none of ...Best 128k model to add CF IDE disk etcHi, i'm hoping to turn one of my speccys into more of a 'console' the plan is i'd like loads of speect games installed say on a compact flash card …
... act 'funny' when extending the bus. One solution is to change ... it the same as a +2a/+3 RGB socket, or at ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... screen data appear on the bus. Note that T1 is ... no data clashing on the bus.
[QUOTE] ... 're going for a Address Bus = 0x4000 - 0x7fff AND ... there is IR on the bus). This suggests that the ... those other "idle bus" points wrong), while +2A/+3 ULA applies ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... these regular M cycles. On +2A/+3, the only contended T ... the value left on the bus by the preceding M or ... cycle. Also note that this bus value does not change even ...Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... /> Various schemes that have been floating through my head include: make ... memory mapped mode versus indirect bus mode doesn't really affect ...Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... /> Various schemes that have been floating through my head include: make ... memory mapped mode versus indirect bus mode doesn't really affect ...divIDE woesHi y'all ! Last night I built my lovely divIDE ;-) I downloaded flasher and +divide.tap from [url]http://www.biehold.nl/rudy/+divide/index.htm[/url…
... ? JP1 should be on for +2a/+3 and off for any ... /> When the address on the bus is 0, ROMACC=1, M1 ...
