-
+3 Audio hates me with a passionHihi Since nobody seemed to have a spare +3B board, I've been trying to replace the audio entirely, aiming for a speaker inside the machine Since p…
... seemed to have a spare +3B board, I've been trying ... -
Timing... in the CSS faqI was looking at the CSS faq for something completely unrelated and noticed: [quote] Then the 192 screen+border lines are displayed, followed by 56 …
... placing a cooler onto the ULA has been observed to remove ... vary slightly with temperature. The ULA dissipating heat into the PCB ... period of time. Preventing the ULA from getting as warm as ... -
A video interface for the Spectrum, MSX compatibleSo you can use the same code for displaying sprites, tiles, characteres, and so no, on both the Spectrum and the MSX. That is, the Spectrum now has a…
... -screen" feature: the well known ULA video output, and a TMS9929 ... -
Another badly behaved RAM upgradeI have a 48K issue 4A board (yellow it is) that was a 48K machine from new, but only reports 16K working with the Sinclair ZX Test ROM in an Int2. H…
... swapped in a known good ULA chip just coz its an ... -
Suggestions for Mr. Rich MellorRich, is there a chance any of these things could be available from you in a near future? -AY interface for 16K/48K Spectrums -PS/2 keyboard interfa…
... fix on +3, memory replacement, ula replacement, hardware fix to add ... -
Sinclair Spectrum ULA BookAnnounced in the Hardware forum, but might be interesting to others: [url]http://www.worldofspectrum.org/forums/showthread.php?p=324213[/url] Regar…
Announced in the Hardware forum, but might be interesting to others:
[url]http://www.worldofspectrum.org/forums/showthread.php?p=324213[/url]
Regards
Chris -
Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…
... good staff already built in? ULA, Z80, LM1889 must stay in ... -
Dead microdrive advice plsHi, I recently got a box of bits off ebay, and one of the items is a dead microdrive. Now assuming the motor inside it works (I havnt tried putting…
... -solder incase I fry the ULA) what are the likely causes ... -
Help with faulty +2ahi everyone I'm Nuno from Portugal I think I made poopoo with a 128k +2a motherboard I had spare for testing purposes This motherboard has always …
... to 48k I think the ULA is working no?
the ... ula on amstrads is that square ... -
Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…
... /> [CODE]
LD HL,16384 ; 3B 10T
LD DE,16385 ... ; 3B 10T
LD BC,6911 ; 3B 10T
LD ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... Res?arch r$...
The ULA gets very hot.
ULA ferranti #7, all new electrolytic ... some custom fit heatsinks for ULA, Z80, etc...
I seem ... -
SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
... issue 4B (rubber keys)
[*]ULA inside is of type 6C001E ... case with other issue boards, ULA versions, or SRAM types. Right ... -
Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…
...
There is also the ULA replacement.
There's DEATH ... -
Yay. Found an issue 1!I've had a Speccy sitting about the house for a while, unused as it only ran as a 16k (a sticker seal on the casing suggested either a 48k upgrade or…
... 1 16k (with the little ULA daughterboard).
Thing is ... -
+2 datacorder noise eliminationHello :-) I have recently bought a gray +2, and as expected, it is plagued with the "datacorder noise in sound output" problem. I have found a few …
... by motor reaching and destroying ULA if the whole datacorder circuitry ... is wired straight into the ULA without any buffering and a ... the possibility of killing the ULA if the voltage applied exceeds ... -
Sprinter 2000A while ago I bought the Sprinter 2000 from the now defunct St. Petersburg-based company Piters Plus. It is one of the last five or so of the 120 or …
... IDE disk support.
The ULA is kept inside an FPGA ... -
Odd behaviour: Multiface 128/OneIt's been quiet round here the last day or two so... I'm now onto the second edition of the [COLOR=Green]Spectrum Games Bible (1985-1986)[/COLOR] an…
... .
On my Issue 3B 48K machine, I tried [COLOR ... -
interface1discipleanyone manage to virtually connect two emulators running on the same machine? could zx spin be modified to replay two rzx files simultaneously? any o…
... an lcd screen - think the ula snow comes thru ? -
DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine... Looking at the image on the screen,…
... ago, csmith noted that the ULA sometimes exceeds the datasheet's ... -
ZX music for *TWO* BEEPERS :)Hi there. :) For some time I was thinking about making for ZX Spectrum an additional sound-card playing BEEPER music without Spectrum's CPU time. I…
... /MINE+IS+TWICE+BIGGER%21+%3B%29+++TWO++beepers%21/[/url ... -
issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... /[/url]
I know only ula working fine and have good ... -
Speccy composite out oddityBruno sent me a Speccy board (4b) which works good. It also had the composite video conversion done on it. Anyway....I plugged it into my Commodore …
... the other model was a (3b..I think).
Anyone ... -
Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
... aquired a zx spectrum (revision 3b) of the rubber key variety ... />
Ive noticed other Spectrum 3b users with this problem yet ... -
How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... when neither CPU0 nor the ULA are using it. This ensures ... -
Issue One 'Dead Cockroach' chipI recently got hold of an Issue One spectrum, and I started wondering: is the dead cockroach chip required due to a flaw on the PCB, or is it really …
... really a flaw in the ULA chip itself?
Also ... -
2 new FPGA based clone from russiaFirst of all I wanna introduce you to the [B]ZX Evo[/B] by NedoPC -> [URL="http://www.nedopc.com/zxevo/zxevo.php"]http://www.nedopc.com/zxevo/zxevo.p…
... an FPGA instead of an ULA, so you can make it ... -
Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... various components such as modualtor, ULA, Z80, memory etc.
... [CODE]Serial : [xxxxxxxxxxxx] [ colour ]
ULA : [5C012E 5C112E 6C001E-6 6C001E ... Serial : 001-62176 white
ULA : 5C102E 8217
CPU : ... -
Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... true Z80 and a true ULA, and at most, 48K RAM ... -
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…
... is great, ROMS are great, ULA must be good due to ...
