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Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…
... to the display. The display RAM could be shared on the ... , or to actually ignore the upper bits of the address bus ... even built in buffered display RAM interfaces for easy CPU implementation ... -
ArmalyteWas just browsing through some old YS stuff, and remembered the playable demo of this. Just got it and had a go from the archive. It's actually a ver…
... RAM configurations. That alone probably would've ensured it was a failure ... -
New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
This is what I've compiled so far:
[quote]Resources
=========
* Make all caps
---------------
You can turn CAPS LOCK on or off using a simple poke to 23658:
POKE 23658,8: REM CAPS ON
... -
List of RANDOMIZE USR code effects?Hi chaps, Does anyone have one of these please? Thanks.
... machine code program in RAM - somewhere in the upper 49152 bytes of ... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... Z80 or dead lower 16K RAM.
If you mean just ... 's basically working, though the upper 32K may still be duff. -
"Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]
... different controller chip) The video-RAM in the 128D was increased ... to 64K.
The failure of the 128 series is ... -
48k spectrum, video problems help neededHi All, I have been browsing this site for a long time and today i have finally registered and am after some help!! I have a 48k speccy and the vid…
... certainly.... It _might_ be your upper 32K RAM, but it's probably ... -
is my ZX Spectrum + finished :(When i turn it on the screen i get the usual gray border all around but in the screen area i get yellow and some orange lines with a black background…
... ICs 15-22 are the upper 32K which - even if they ... see if any of the RAM chips at all get warm ... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... rare here) that has IC22 ram chip busted. Need to replace ... is 48k to salvage the upper memory chips from (and unforunetly ... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... simply mix OKI and 4164 RAM then?
I don ... have a spectrum with bad upper OKI RAM, can you simply replace ... 4164 in place of OKI RAM now knows why it ain ... -
broken ZX SpectrumHi there I was given a dead ZX Spectrum years ago, and being bored today thought I'd try it again. Its a Sinclair ZX Spectrum with lovely rubbery key…
... Spectrum's death: The upper 32K RAM bank had the D7 chip ... there.
My dead RAM chip drained so much power ... -
What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…
... chips ARE 16BITS ,but the 'upper' part is not good.
upper 32k of RAM in a 48k speccy ... you want to use the upper or lower 32k of the ... -
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…
... , it's usually the 4116 RAM IC's that go wrong ... repair people say, 48K ULA failure is quite rare - I doubt ... -
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.
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 ...Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... a couple more things than RAM, but if the machine ... makes the CPU fill all RAM with 02 hex, then ... , then you have bad lower RAM.
I had ... Spectrum that had a fried upper-bank chip drawing so much ... replaced the lower eight 16Kx1 RAM chips with a single ...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
