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Mystery Port on ZX Spectrum 48k +Hi, I was wondering if anyone could help me with a little mystery? After I tripped over my first 48k +, and knocked out the joystick expansion, I…
... I tripped over my first 48k +, and knocked out the joystick ... , I bought an almost identical 48k + from a second hand shop ... (2004) so I can't test out my theory - does anyone ... -
New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…
... uploaded a new "Free" Spectrum 48K emulator to the Windows Store ... one I have something to test against.
I would ... -
Whites are yellow - 48k Issue 2I have a 48k issue 2 that appears to be working fine. I've replaced all but 2 of the electrolytic caps (mostly because the 2 were not in stock at my…
I have a 48k issue 2 that appears to ... scope so I can't test waveforms etc.
Any ... -
48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... ,
I have 2 48k's, one works (Issue 4s ... , but not finish the RAM test. The paper goes black and ... -
Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…
... about the Speccy's video contention model - and that's the ... .
Now on the 48K, there's 224 T (224 ... /> And then there's the contention pattern where the memory is ... 16, so that means the contention pattern covers a run of ... -
Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…
I have a rubber key 48k which will not start any ... however on running the soak test on the software found here ... . I also performed the RAM test detailed here http://www.worldofspectrum ... , anyone have any suggestions? Soak test for longer or look for ... -
Sinclair ZX Spectrum 48k in MINT condition + box of 7 original TAPES: just use for test it.http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=172483906363 Probably the best condition of a Speccy (rubber keys) I've ever seen in my lif…
... Speccy and cables: PERFECT (just test if works), brilliant colors, no ... -
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
... up... and oh its a 48k speccy.... Oh well bonus. It ... no problem, did the memory test....oh dear 16k.
So ... any info on logic test points in the 48K service manual I ... thing fires up as a 48k model now ...whooooppiieee....still a ... -
Need help from people with a 48K/128K/+2 (not +2A/+3)Scared ya, didn’t I? Well, this one is very simple and not as involved as [url="https://www.worldofspectrum.org/forums/discussion/55142/need-help-fro…
... actual hardware.
The test is simple. Download [url="http ... />
[b]Note to 48K users[/b]: test as described above.
test in both modes, i.e. 48K and 128K.
Need help from 48K/128K/+2 owners (not +2A/3)!It’s hard to target the right demographic, so I’m repeating my humble request here. Could you, given a few spare moments, test [url="https://www.w…
... , given a few spare moments, test [url="https://www.worldofspectrum.org ... -help-from-people-with-a-48k-128k-2-not-2a-3 ...Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... reduce the effect of memory contention considerably. Possibly with the addition ... such a circuit to the 48K model, but perhaps the 128K ...New release: Windows AGDOkay, so it's not quite a full suite of editors but it's a start. For now you can play with the window size and edit blocks, sprites, objects and th…
... 's not quite a full suite of editors but it's ... should be able to import 48K snapshots (SNA files) from recent ... my priorities now is to test the whole system with bigger ...Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…
... having problems understanding the memory contention in 48k, in instructions like JR ... /wiki/Contended_memory
In 48k JR, it says pc:4 ... is being used there for contention.
Thanks ...48K Issue 3B slowly fading over 15-20 seconds, capacitor gets hot.Hi folks, Recently my much-modified* RAM testing 48K board failed with a hot/burny smell so I turned it off quickly for looking at later. Thinking…
... my much-modified* RAM testing 48K board failed with a hot ... on IC7 so I can test 4116 RAM chips, it's ...48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …
I have 48K issue 2 board (I've ... I've gone onto to test with 170 even though 85 ... actually boot and let me test.
Given the Spectrum ...Test card screenStarted off just messing about in order to test a machine. But ended up with this: [code]10 FOR a=0 TO 0 STEP 0: PAUSE 1: BORDER 1: BORDER 2: BORD…
... messing about in order to test a machine. But ended up ... on a +2 grey in 48K mode:
[url=https://postimg ...Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
... routine for the ZX Spectrum 48K. It was for a text ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... homepage.ntlworld.com/mark.woodmass/Contention.tzx"]http://homepage.ntlworld.com ... /mark.woodmass/Contention.tzx[/url]
... start and end cycles to test in the program before running ... re set for a standard 48K atm). It'll be out ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... matches the FAQ figures for 48K and 128K models. I then ... /frame and tried several arbitrary contention starting points, and it was ... time.
A test on real 48K/128K hardware would be ... runs.
Does the contention pattern look at all right ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... , Woody wrote:
A test on real 48K/128K hardware would be ... />
[quote]
Does the contention pattern look at all right ... ?
[/quote]
The contention pattern is different to the ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... the "right" figure on a 48K.
[/quote]
... Hmm, actually Dunny borrowed a 48K machine from Dave the Lurker ... other program I have to test this information changes the Timex ... than I !
And contention throughout the whole display area ...RealXThis may be a dumb question but will RealX ever get released?
... , thanks to a real 48k speccy and Woody's determined ... during this period is "snow contention".
Your documentation ... with clarification - as snow contention is not applied until the ... none, but we did test the "snow contention", and you do emulate ...RealXThis may be a dumb question but will RealX ever get released?
... work done on the 48k Speccy here, we're ... test programs that Realspec fails on in all manner of contention ... Woody obtained from our real 48k - it's certainly ... bus tests match the real 48k too.
... getting close to 100% 48k accuracy by now, surely? ...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…
... same results on a Spectrum 48K. So if what you're ... interrupt do not experience memory contention?[/QUOTE]
Accepting the ... 14336, then it will experience contention - if it is being fetched ... /> I will try your new test program later.
...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…
... However Spin 0.622 shows contention (presumably in 9th cycle of ... one of these does your 48k match?[/quote]
... test, and the lack of IR contention in Spectaculator for that specific test ... />
The results from the 48K machine here were 10,9 ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... following the cycle requiring the contention to be applied.
test program[/URL] on your 48K machine(s). It ... sync so each port address test starts on the same cycle ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... /InFF.tap"]this test program[/URL] on your 48K machine(s).[/QUOTE ... emulator? If it's not contention, what is it?
Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …
... I'm programming for the 48K Spectrum. I'm assuming ... just disregard anything other than 48K users.
The ... between interrupts. The memory contention timings are also different between ... machines, perform a simple test to determine the machine type ...Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …
... the game running in 48K I'll have a ... on both 48K, and 128K / +2 in 48K mode. It ... Interestingly, the way that the contention works actually serves to regulate ... . It's having less contention on the +2A that ... would be willing to test on real hardware.[/QUOTE]< ...Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…
[QUOTE=csmith;346002]What test was that ZXbruno?
... the result of the first test. Here's what Fred said ... screen data and what the contention pattern is.
Could ... area around where the PAL 48k starts reading the screen, one ...
