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Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…
... say there are about 4000 floating point operations performed if ... instructions per operation. A floating point multiply with 24 mantissa ... each micro uses to represent floating point numbers; the actual ... may also suffer from some bus contention caused by video ... -
Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…
... Atari Basic which implements its floating point code in BCD. ... simply stating each machine's floating point representation in a table ... compared to the thousands of floating point operations inside the ... may also suffer from some bus contention caused by video ... -
Original Kempston interface on a +3Hello everyone, if i insert an original kempston interface in the extension port of a +3 should it work or not? I tried it and the machine didn't bo…
... , interfaces don't work because bus interface is dirty.
2A/+3 models. I would have ... -
Original Kempston interface on a +3Hello everyone, if i insert an original kempston interface in the extension port of a +3 should it work or not? I tried it and the machine didn't bo…
... is +2E? You must mean +2A or +2B
it ... 's a +2A with +3E eprom
2A with it has the spectrum ... idea to clean the expansion bus of your spectrum
2A with +3 board is a ... -
True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…
... hang something off the speccy bus that watched writes to video ... just the keyboard from a +2A and the motherboard from a ... -
Group Order of Internal/External Kempston Turbo InterfacesI have contact Velesoft ([url]http://velesoft.speccy.cz/kmturbo-cz.htm[/url]) about the production of internal or external kempston turbo interfaces …
... contain signal VIDEO on ZX BUS. On ZX128/+2(grey) models ... this same pins on ZX BUS unused(red signed on picture ... ZX128+2A/+2B/+3 is this pin on system BUS used as ... -
DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…
... .[/QUOTE]
Yes, +2A and +3 support allram mode ... set then divide or +2A/+3 can be destroyed.
2A or +3 ( without DIVIDE).
bus to +5V (disable rom ... is unusable on ZX+2A/+3 with active allram.< ... -
DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…
... connected jumper "E") on ZX128+2A and +3 models !!!!!! Exist ... original games designed for +2A allram. After run this game ... contain autodestruction software for +2A/+3 models with connected DIVIDE ... + board via resistors to ZX bus (resistor 330 Ohm)
- ... -
DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…
... $1ffd , %xxxxxxx1 on +2A/+3 with divide attached? I ... memory to low16kB and +2A/+3 can't disconnect ... = data colision = ULA in +2A/+3 can be destroyed !!!!!!
2A/+3 allram(OUT 8189, ... ula) will collide on data bus with divide memory !!!
... -
DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…
... this mode is set also +2A/+3 allram(OUT 8189,xxxxxxx1 ... (ula) will collide on data bus with divide memory !!!.[/QUOTE]
bus on a +3 and how ... -
New Spectrum owner - Newbie questionsHi, I just got my first Spectrum in the post today +2a) and I'm looking for some advice on a couple of things: Firstly I'm not the biggest fan of j…
... Spectrum in the post today +2a) and I'm looking for ... despite them fitting into the +2a joystick ports, they?re not ... since the ports in a +2a are Sinclair Interface 2 and ... . The incompatible parts of +2A expansion bus is the ROM Switching part ... -
New Spectrum owner - Newbie questionsHi, I just got my first Spectrum in the post today +2a) and I'm looking for some advice on a couple of things: Firstly I'm not the biggest fan of j…
... . The incompatible parts of +2A expansion bus is the ROM Switching part ... into the back of the +2a because the standard 48k and ... +2a are such different shapes.
< ... -
multiface 128 on +3Hi, Why the multiface 128 is not compatible with +3 ? Is this due different voltage ? (so can be fixxed by using a 'custom' pass-throught board? etc…
... for use with original ZX bus. System bus on ZX128+3 is ... . ZX128+2A and +3 use different signal pinout on system bus and ... -
Two easy +2 hardware questionsI'm thinking about getting some extra hardware for my grey +2. First of all, one or two Kempston interfaces: - Do many games actually support two Si…
... DivIDE+ is for the Spectrum +2A/2B & +3) I think ... pin out on the expansion bus and requre the DivIDE+, but ... -
My annoying computer threadAs i have just purchased my first computer i thought id start a thread where i can ask you all anoying and possibly simple questions. first off ive …
... of dodgy capacitors that were floating around the world at the ... being caused by an obsolete bus, or obsolete processor socket, or ... -
General question about electronics I guess... (128k +2a)[Short question] When I very slightly put my finger on top IC15 on my +2A the TV picture becomes crazy and the spectrum acts if it just resets I don…
... on top IC15 on my +2A the TV picture becomes
floating" (i.e. not connected to ... -
+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 …
... game work on emulators in +2A mode with all rom versions ... value than #FF on data bus) then will game crash. Batman ... is possible connect to ZX bus "K-MOUSE 2008" interface (contain ... -
Easy storage device.Hi all, I am fed up with unreliable tape / wav loading on my +2b so would really like another way of loading games. I know nothing at all about how …
... /> If you have a +2 / +2A / +2B or +3 then, yes ... Spectrum you will require a bus expander. This will allow you ... edge connector.
[B]Bus Expander:-[/B]
[IMG ... .jpg[/IMG]
[B]Bus expander you can buy from ... -
Easy storage device.Hi all, I am fed up with unreliable tape / wav loading on my +2b so would really like another way of loading games. I know nothing at all about how …
... ]If you have a +2 / +2A / +2B or +3 then, yes ... Spectrum you will require a bus expander. This will allow you ... connector, or one of those bus expanders. There are no compatibility ... -
Easy storage device.Hi all, I am fed up with unreliable tape / wav loading on my +2b so would really like another way of loading games. I know nothing at all about how …
... connector, or one of those bus expanders. There are no compatibility ... the +2A / +2B / +3 models though. The signals on the bus connector ... -
Easy storage device.Hi all, I am fed up with unreliable tape / wav loading on my +2b so would really like another way of loading games. I know nothing at all about how …
... the +2A / +2B / +3 models though. The signals on the bus connector ... very unusual to me. The bus isn't that different - the ... ). The resulting collision on the bus will cause a crash, but ... -
TR-DOS on Spectrum +3: it works now.Hi there. I found this interface for Atari ST long time ago but now I noticed something interesting. The interface is for people who has dead flop…
... : I'm not sure if +2A/B has somewhere on the ... real betadisc interface to system bus and to FDD cable connect ... -
Announcing: The +2A/+3 FLASH ROM adapter boardAs I've mentioned in a couple of other threads, this project is coming along quite well now, so I thought I'd post some details up here. I've built …
... />
[B]Sinclair Spectrum 128k +2a/+3 System Rom Flash Replacement ... 16k rom images (a full +2a/+3romset). A TTL quad 2 ... IC. It plugs into a +2A or +3 motherboard in place ... FLASH rom by the address bus signals obtained from the rom ... -
dodgy bayerjust to let you know, I have got a refund off "the" auction site.. and not to buy speccy things off someone called "baconbuttyman" the email begins …
... went to pick up a +2A in Birmingham, the guy was ... cos i was travelling by bus and i already had like ... of 19.99 and 3quid bus fare -
Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…
... generator attached to the expansion bus. This device could snoop ... the data bus to find out what ... not available to the expansion bus. In fact, you won ... VRAM data at all in +2A/+3 models.
bus. You can have an ... -
Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…
... not available to the expansion bus. In fact, you won't ... VRAM data at all in +2A/+3 models.
[/QUOTE]
Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…
... the expansion bus. Besides, it's truly periodic in +2A/3 models ...CPI emulationI'm currently writing Sinclairean's emulation assembly for the CPI/CPD/CPIR/CPDR instruction group. Does anybody know what exactly the behavior of th…
... contents remain on the address bus for those 5T but the ... attention to MREQ) whereas the +2A/+3's does not.CPI emulationI'm currently writing Sinclairean's emulation assembly for the CPI/CPD/CPIR/CPDR instruction group. Does anybody know what exactly the behavior of th…
... contents remain on the address bus for those 5T but the ... attention to MREQ) whereas the +2A/+3's does not.[/QUOTE ...Modding / repairing a +3I've got a +3 and I'm repairing and enhacing the computer. The enhacements I've done so far: - A slightly buggy video composite output. - Repairing …
... alone and go for the +2A / +3 versions of failing games ... present content of the VRAM bus.
