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Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
... ,4 and 0 in non-contended memory doesn't behave as ... IC20 and try the POKE test again. It should give you ... -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... usual suspect is the contended RAM bank, but there ... an easy way to test for damaged chips, but ... br /> Well... if the temperature test doesn't work, and you ... DRAM chip in the non-contended bank).
... any chip from the contended bank is failing.
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... out which memory from the contended bank is damaged (and ... the CPU, or the non contended RAM, as these devices share ... ROM.
So another test is to measure (with the ... probably), or faulty multiplexers. Non contended RAM is not directly connected ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... want to give the btime test a go as well. What ... contended and uncontended memory. IN 255 always returns 255.
Which test ... is "btime" test? I couldn't find ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... white paper area. For this test, after the BORDER 0 ... br />
Time for another test: what happens with memory? I ... a program running in contended memory, writting to contended memory (or at ... we calculated for a non contended behaviour.
The ...RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…
... a RAM failure in non-contended area
[url]http://www ... />
A sort of stress test for memory to help diagnosing ... misdiagnosed as having damaged non contended memory.
[url]http://www ...Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... crashes? and How could I test the code if I change ... pointing to an area in contended memory even when interrupts are ... that any code executed in contended memory will (sooner or later ... . Your routines can be in contended memory without problem, as long ...Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... , I have no way to test anything as this doesn't ... previous releases page in a contended memory bank while I contains ... $C0 and $FF, AND a contended page is set in $C000 ...ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…
... "I" can never point to contended areas, even when interrupt is ... I >= $C0 and a contended RAM page is paged in ... had the means to actually test this, as I don't ...ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…
... is the model I always test my games on (in emulators ... 0) before paging in the contended RAM pages. As I always ...ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…
... exact reason is unproven... Some test programs might be a good ... could say I = contended area and PC = contended area and then put ... a snow warning when I = contended?Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... ROM that never tries to test upper RAM, so I can ... into 16K mode and perform test using BASIC or assembler.
contended RAM.
Depending upong ...How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... harm in running code in contended RAM so long as it ... ,tile (or whatever) data from contended RAM was slower than taking ... above 32767. A quick border test shows there is zero or ...Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…
... , you may always need to test if you're on late ... part of that will be contended. I wonder if it's ... is something I need to test for before release, but I ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
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Flavio Matsumoto performed this test again, this time using the ...
LDIR... failed (0x7f)
Contended IN... failed (0x7f)
Floating ... bus... failed (0x38)
Contended memory... failed (0x7f)
High ...ULA TEST 3 results on real hardwareHi guys, I'm writing small spectrum emulator and I wanna implement precise emulation for different spectrum models :-) I found nice test for conten…
... , but zxmak2 failed on test 12 (both contended and uncontended) and tests ...Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…
... is set to point to contended memory still occurs, and also ... is set to point to contended memory.
[/quote]
Any 128k user capable to test Robocop III is here? :)SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... "production board" shown here, and test if my -somewhat cheap and ... ports, which are not actually contended).
There is even ...SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... "production board" shown here, and test if my -somewhat cheap and ... ports, which are not actually contended).
There is even ...DivIDE and custom RomsI've got a DiVIDe 57c that I bought of bverstee earlier this year which works with all my machines with the original roms, boots up, detects for driv…
... />
however (I need to test this) I've only tested ... mutant HAL to alter the contended memory to match the +2a ...EmuzWinHi folks I'm using EmuZWin and it's started running games super quick (not all games but some) I've tried messing around with speed settings but eve…
... be some sort of special test of accuracy.[/quote]
... usefulness of BorderTrix as a test case is falsifiable. You ... of no interest as a test case.
... II is a useful test of 128 emulation accuracy ... only glitch when fully contended I/O is properly ...Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…
... quick update: burned a 128K test EPROM from Fruitcake, ran the ... all the contended RAM bank chips, and each time the test EPROM ... , hence I'm confident the test works correctly.
... Z80 works correctly (otherwise the test could have not run altogether ...Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…
... sockets I put under the contended RAM chips, I found a ... was replaced, and the whole test was passed with flying colors ... bad RAM chips in the contended RAM bank. This led me ...Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... machine code first to test which are the contended banks. So it ...Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …
... burn an eprom with the test ram rom from here ,[url ... /Interface2_RC_New_RAM_Tester.htm[/url]
test seems to be working but ... stuff that i am unfamiliar, contended or not ram, pages, data ... up the spectrum?
test ram rom file was 8k ...Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …
... burn an eprom with the test ram rom from here ,[url ... /Interface2_RC_New_RAM_Tester.htm[/url]
test seems to be working but ... stuff that i am unfamiliar, contended or not ram, pages, data ... up the spectrum?
test ram rom file was 8k ...
