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Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…
... recall a faulty Z80 or ULA can make it appear broken ... -
SLAM48 ula will have a PAL/NTSC selector?So I read that elsewhere, however is it a rumor or is it confirmed? But is that even possible?
So I read that elsewhere, however is it a rumor or is it confirmed?
But is that even possible? -
ZX81 composite modHi guys. I have picked up a ZX81 untested for a few quids. I do have a problem tuning it correctly on a Crt TV. I cannot get better than a wavy black…
... press keys). I assume the ULA may be ok but ram ... is an issue 1 with Ula marked 2C184E.
thanks -
How are LAST-K and FLAGS set on a Real Spectrum?Hi, I'm writing a Spectrum emulator and I've got Horace and the Spiders working (with the wrong colours and no sound) but when I boot into ROM non…
... a real Spectrum by the ULA but I couldn't find ... -
ZEsarUX Beta 7.2-RCHi I have uploaded a new ZEsarUX Beta version: 7.2 Release Candidate! Next version will be final stable :) You can download it from: https://g…
Sinclair 16k Ram pAck Issue3 schematicsHi guys, I am willing to repair a 16k ram pack for the ZX81 but I cannot find any schematic of the ISSUE 3 ram pack. I could only find a schematic…
... 's I/O one single ULA on nest issues. The problem ...48K picture quality vs motherboard revision?A subject thas has probably been covered elsewhere and hundreds of times, I know. But I never quite understood if there was some identifiable patt…
... motherboard revision with a particular ULA that yeld the best results ...Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …
... at which moments the 48K ULA samples the current border color ...ZEsarUX stable 7.2Hi! I have uploaded a new stable ZEsarUX version 7.2! You must go to the Releases section on the GitHub project to download It, as usual: htt…
Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... greatly appreciated.
[b]ULA heatsinks[/b]
As the ... a heatsink to the the ULA without needing to desocket it ... 'll need to pull the ULA out of the +2 in ...A next Spectrum ROM with Turbo and MonitorI made a copy of a secondary ROM file that was used in my Didaktik Gama (Czech Spectrum clone with original ULA) but it was probably made for 48k Spe…
... (Czech Spectrum clone with original ULA) but it was probably made ...Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…
Hi Guys
Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I correct assuming its reading a byte of screen ram then an attribute byte, and so on...?Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…
... with the seller keeping the ULA ic. Pictures in the auction ... did was to fit a ULA and get the board to ...ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…
... Diags, all of the tests (ULA, RAM, ROM) were OK, so ...How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…
... 23 t-states), isn't ULA painting during the instruction too ...ZEsarUX Beta 8.1Hi! I have uploaded a new ZEsarUX 8.1 BETA version. You can download compiled versions for Windows, Mac, and the source code from: https://gith…
... scroll x,y on ula layer
-optimized ula,lores render routines ...ZX Interface 1Hi, I have a ZX Interface 1 which I have bought online. It does not seem to work. When using CAT1 or any other specific commands, the compute…
... ' transistor soldered directly on the ULA. Ula is LA15-302.
ULA.
All these seem ... ROM is dead or the ULA?
And another question ...ZEsarUX 8.1 stableHi! I've uploaded a new ZEsarUX 8.1 stable version. Go to the github released webpage to download it: https://github.com/chernandezba/zesaru…
... official SD images
-optimized ula,lores render routines: 2% less ... /> -added scroll x,y on ula layer
-added 1-bit ...
-fixed "bit 7 = Disable ULA output (soft reset = 0)" on ...ZX Spectrum 48K Issue 4B No soundHi, I have a ZX Spectrum 48K Issue 4B without sound. I tested the ULA on another Spectrum and works fine, tested the speaker and it has the correct …
... sound.
I tested the ULA on another Spectrum and works ... , tested continuity from pin 28 ULA to emitter of TR7 no ...48k issue 4B display problem etchi,, i have a zx spectrum 48k issue 4B with a display issue it has wavy lines in both the border and paper,some colours seem worse than others ie red…
... ,new lower ram module.different ULA,crystals,full re cap,disabling ...zx spectrum +2 no clock signal ??help me ...... looking at a specie +2 (original +2) it is the Z70700 issue 1 (uk one) i seem to have no clock,no display,no sound at all. it is sho…
... lot done,i know the ULA/ROM/CPU are good as ...Speccy 4A board problemHi all. I was hoping for some help with my Speccy (with 4A Board) before I send it off for repair. When I power it on all looks fine (i.e. copyright …
... screen. I've swapped the ULA with a known good one ...48k spectrum pausing the clockI had a spectrum 3b motherboard donated to me with no case. So i have decided to put it in a custom case with built in kempston port etc. I also …
... on one side to the ULA and the other side is ... (in the same way the ULA does AFAIK). The switch sometimes ...zx spectrum 48k interference during first two minutes of warm upi have a issue 3B 48k that i am looking at during the first two minutes (approx.) of warm up there is interference on the screen (tried to take a pic…
... only chip in socket is ULA which i have tried swopping ...Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…
... LCD panel, with some extra ULA registers, so I can add ... won't rely on the ULA to drive the signals at ... probably replace much of the ULA, perhaps even relocate all of ...
