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Speccy MTBFHi, Looking at the old (issue 1-2) PCBs, they do look like someone knocked them up in an etching bath/with a soldering iron in their shed but has th…
Mine most bizarre failure was on 48K Speccy, board ... that under one of 32KB RAM chips there is a little ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... be used to indicate power failure or the expiry of a ... the interrupt vector table in RAM and arrange for our own ... our own interrupt subroutine in RAM running, we need to put ... -
Why so many disk systems?Why did the Speccy have so many floppy disk systems like wafadrive, tr-dos, +3disk, and many more? As far as I can see, this did nothing but create …
... board was fully populated with RAM or not.[/QUOTE]
upper block was added as an ... -
Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…
... ago something similar, ROM for RAM testing. At this moment I ... in 48K mode in some RAM error cases?
I ... in mood to desolder 16 RAM chip without beeing sure... :D ... ) is from one of the upper 128K memory banks. It'll ... black if there's no upper bank. -
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... received in the US. The failure rate was claimed to be ... had been a shift in upper management that led to the ... -
Spectrum won't load data when warmI've got an interesting observation. I put iPodLinux onto my iPod and got TZX files playing back as the proper audio waveform. I also removed the vol…
... are mapped to the screen ram area.
Its possible ... components drift towards the bordeline failure level. -
ZX Spectrum 16k by IskraHi everyone. I have posted the pics in some other thread... but it is HW related. Anyway, I have got a ZX 16k manufactured by ISKRA. It is in a box …
... it (atleast not on the upper side - I haven't screwed ... empty sockets for the 32k ram and control chips.
Firefox (new thoughts)Maybe more people would use Firefox if there was a version for the Speccy! [code] 10 PRINT AT 2, 2; "Press F for Firefox or I for M$IE" 20 LET K$=IN…
... /> [quote]
4. How much RAM would your version of Firefox ... my home page is 1.16kB. Even a Speccy can hold ...Firefox (new thoughts)Maybe more people would use Firefox if there was a version for the Speccy! [code] 10 PRINT AT 2, 2; "Press F for Firefox or I for M$IE" 20 LET K$=IN…
... my home page is 1.16kB. Even a Speccy can hold ... /> I think you'll find RAM wobble was back in the ... of the ZX81 when the RAM pack was an add-on ...Spectrum RAM Paks...This jogged my memory (excuse the pun!!) : [url]http://cgi.ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQ…
... put one of these 32K Ram packs on a 48K Spectrum ... /> both the internal upper 32k and the RAM pack will be mapped ... edge connector to disable internal RAM (unlike the ZX81), they'll ...Spectrum RAM Paks...This jogged my memory (excuse the pun!!) : [url]http://cgi.ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQ…
... :-)
Still, if a RAM chip in the speccy or ... consumption, twice the odds of failure.Multiface 128 problemHello everyone i have a 48k plus speccy which i firstly thought was working perfectly. It passed all the test of the official Sinclair test tape (cpu…
... chips deal with the 48K RAM switching, and are not present ... 's not a matter of failure as such, just "out of ...48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …
... a row. These are 4116 RAM chips. What numbers etc are ... chips and make up your upper 32K block. They probaby won ...Ways to use double buffering in basicI was meddling with woody's print stream code where you can print characters at any pixel location on screen. I was playing with 12 sprites, very ann…
... frame history but the remaining RAM in the screen pages could ... would have to fit in 16Kb (as your "on screen" and ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... a dead 32Kbit OKI Ram Chip in the upper bank. I replaced ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... scope
I removed all upper chips
[url]http://217 ... too and place sockets for ram and try use new ramchips ...Problem with SPIN assemblerCan anybody tell me why the following machine code program doesn't assemble in the SPIN assembler? ; my first machine code program ld bc, 5 ret Any…
... directive followed by a valid ram location so that Spin knows ... your code starting in the upper 32K.
Cheers
a dumb question?Well, I have been confused with all these interfaces so I have the following question which will make things clear for me... ;) Is there a "device" …
... you anything over the RAM (which is battery-backed ...
I understand how RAM works as ROM. I just ... there any usage of 512K RAM as RAM, not ROM.
... couple seconds for 16KB.
In theory, RAM is better ( ... can be used as RAM, therefore I asked for ...DivIDE and RWAP's DiwIDE*Opps, sorry, wrong forum, this thread must be in hardware topic.* I was planning to get a divide from Rwap, but I'm too afraid of long way the devi…
... about ResiDOS - could this extra RAM/ROM facility be implemented on ... select the mode (DivIDE, ROM, RAM, reset).
- Q5 must be ... ..Q4 select a 16kB page for ROM/RAM modes and 32kB area ... are enabled with selected ROM/RAM banks. This disables the internal ...I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... ). On FPGA is also implemented 16kB RAM (the contended part). ROM is ... in Intel StrataFlash. Rest of RAM will be implemented in external ... DDR RAM (at the moment my friend ...Problem with Spec 128k +2 !! Noob calling for help!Hi there, I have an spec 128k +2 which was working fine, played with him yesterday and today when i tried him again he gave me this [URL="http://go…
a typical crash... failure of ram, ula or anything :P
(we got those answers from this forum all the time)Any interest in new low-cost mass-storage interface with 512K RAM?I've recently added support to ResiDOS and the +3e ROMs for SD/MMC card interfaces; in particular, ZXMMC (which has no onboard RAM and so is only sup…
... to crate a non-volatile RAM disk one of the best ... /> It works like normal static RAM (no burst mode) but retains ... and some logic to select upper or lower byte and interface ...Spritual successor to the Speccy1988-1995 - Atari ST/STe/Falcon 1995-2000 - ? hmmm ? 2000-2006 - Playstation 2 with a keyboard 2007- ?
... but it was a massive failure.[/quote]
The funny ... , forget the 24K of screen ram that needs to be moved ... useful then that 512K of ram, 16 switchable screens to play ...Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... 16K pages), single 512K static RAM (I think this can be ... the voltage regulator in the upper left doesn't even have ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... other supplies and removed last. Failure to observe this precaution will ... to system use, where failure of the Vbb supply must ... and GND to the 4116 RAM with the +12/-5v ... likely to fry your lower RAM! Hideous devices, these 4116s... ... be replaced with static RAM!TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…
Won't initialize above 16K RAM - well, either A15 on the ... the chip select for the upper 32K is fried. It's ... between the lower 32K and upper 32K based on the state ...TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…
... than the 7805, but the upper 32K RAM runs off just +5v ...Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... , with the top of physical RAM (PRAMT) being set at 32768 ... lines.
consider dodgy Ram chip A.
Setting ... (both bytes in the same ram chip) the program outlined above ... 170 sets the whole of upper memory to 170, again the ...Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... keeps going to the same Ram chip when a fetch or ... should be going to an upper memory chip the program won ... always going to the same RAM chip ........
HMMMM .... it ...Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
These days, use flash - don't bother with eprom. You can replace the ROM by making an external board that connects to the edge connector, and nails ROMCS high just like ZX Interface 2, so that the on-board ROM never gets selected. Simple decoding logic ...
