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The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... no avail. I get the ULA snow, sure thing, but that ... -
New colour palette for Spectrum emulators, 16K/48K/+ machinesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …
... ’s book The ZX Spectrum ULA.
This colour palette ... use the original Sinclair Ferranti ULA, 5C102E, 5C112E or 6C001E. It ... is not suitable for 128/+2/+3/+2A machines, as ... -
6C001EE-7 ULA A ULA ID I haven't seen before, possibly a misprint? Found on an issue 6A board in a rubber key 48k. Any ideas? [img]https://pbs.twimg.com/media…
A ULA ID I haven't seen before, possibly a misprint? Found on an issue 6A board in a rubber key 48k. Any ideas?
[img]https://pbs.twimg.com/media/DbYC8aNXkAANAm4.jpg:large[/img] -
Mulitface 128 pcb onlyhttps://www.ebay.co.uk/itm/Recreated-Romantic-Robot-Multiface-128-PCB-Bare-Board-ZX-Spectrum-48/263614388066?hash=item3d60a45762:g:X54AAOSwy05a1QQ- …
https://www.ebay.co.uk/itm/Recreated-Romantic-Robot-Multiface-128-PCB-Bare-Board-ZX-Spectrum-48/263614388066?hash=item3d60a45762:g:X54AAOSwy05a1QQ-
multiface 128 pcb only anyone got the components please? -
D.T Decathlon vs Hyper Sports vs D.T Supertest 128Hi everyone and welcome to the August 2018 edition of the "Which Is Best?" series. Last month I placed International Karate and IK+ (representing al…
... and Daley Thompson's Supertest 128, which game do you think ... -
where can i get ula's from?i want a nebula ula from retroleum but they have sold out. i also googled it and had a look on ebay and i cant even find any normal ula's either.
i want a nebula ula from retroleum but they have sold out. i also googled it and had a look on ebay and i cant even find any normal ula's either. -
Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …
... 2 with a 5C112E-2 ULA. Just had to replace ... maybe a problem in the ULA could cause b) or ... great book "The ZX Spectrum ULA: How to design a ... br /> Patrick
My ULA Y output:
[img]https ... ://i.postimg.cc/HxDsHvPC/ULA-Y.jpg[/img]
... -
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 ... -
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…
... the following:
Spectrum 128 Toastrack
Spectrum +2 Grey ... 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 ... -
Fixing a ZX Clone from .ru - 27 years late.Hi there, I've currently assembled another russian clone a "Compact 256 Turbo" from a PCB I bought. The machine appears to be fully functional and o…
... I already have a Pentagon 128 and the Scorpion 256 being ... the Compact (Top is Scorpion Timings, Bottom is Compact):
... /> Documentation:
Schematic for Compact 128 here (that machine has a ... .it.omegahg.com/Compact/COMPACT-128.pdf
PCB Top: ... -
doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... to swap a 6C001E-6 ULA type with a 5C112E ?
ULA.
Diagnostic ROM doesn't ... would like to swap the ULA and Z80 to narrow the ... like to try swapping the ULA as I have another working ... -
The ZX Spectrum ULA bookFound a copy of the ZX Spectrum ULA book by Chris Smith that I've never read. This is a new book that was given to me years ago and I've never got ro…
... copy of the ZX Spectrum ULA book by Chris Smith that ... -
zx spectrum ULA upgradei have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be…
i have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be used but should some resistor values be changed to match it ?
thanks mark .. -
Harlequin 128 Rev 2D with ZX Interface 1 RS232Hi, Does anyone have any experience of using serial interface on ZX Interface 1 plugged into a Harlequin 128. While microdrive works fine, i can't…
... 1 plugged into a Harlequin 128. While microdrive works fine, i ... -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ?
i wonder if anybody has done any before & after heat tests ? -
Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…
... functionality of the Interface 1 ULA, similar to the "The ZX ... Spectrum ULA" book?
Specifically, what ... the ROMEN lines of the ULA? Superficially, ROMCS feeds into the ... -
Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... my oscilloscope (on both the ULA and CPU), however, the voltage ... swap, PRINT PEEK 23733 returns 128 instead of 255 (or 127 ... -
Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …
... conditions, the interference of reading ULA screen data and memory regeneration ... snow effect: at 16/48/128/+2 machines snow appears if ... are addresses #4000..#7FFF, for 128/+2 these are also addresses ... turned out that on some 128 machines the snow effect leads ... -
what is the best..............hi there, could anyone tell me what is the best emulater as I no longer have a spectrum but would really like to get hold of an emulator but which on…
... z80/ULA emulation at the moment, such as incorrect 48k border timings ... -
My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …
... ports
>ZX Spectrum 128 GPU
>ZX Spectrum ... 128 DSP
>2 heatsinks ... /> GPU? Are you using the ULA or not? If you're ... -
Spectrum modficationsThere is a post about Outrun on the games forum, which makes the fair point that the game is playable when you double the speed on an emulator. Other…
... screw up the memory/logic timings - if so, replace with faster ... stuff.
the ULA screen update timings would be shot away ... -
Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…
... TAP into RealSpectrumEmulator, and use ULA FX Hardware Multicolour to display ... work hopefully even better on 128. i explain my idea at ... -
Is spectaculator emulating the +2 correctly?i remembera few games that would crash when running in 128K mode, due to a bug in the hardware of the grey +2, hence it being replaced with the +2a. …
The 'snow bug' in the ULA is present in all models ... present on a toast rack 128.
Cheers,
Is spectaculator emulating the +2 correctly?i remembera few games that would crash when running in 128K mode, due to a bug in the hardware of the grey +2, hence it being replaced with the +2a. …
... some letters repeat as the ULA got confused)
(Woody ... reproduce this even with 'emulate ULA snow' turned on?)
128 didn't crash in any ...New SpeccyDo you think someone should go about creating a new spectrum computer? I'm talking about a spectrum compatible (not an emulator) with the capabiliti…
... characteristic to the Speccy: the 128 had extra memory and the ... had TR-DOS and different timings, the Scorp had hard drives ...Loading programs directly via SoundblasterLet's just hope this does not sound too silly (I'm a newcomer)... Is is possible to connect a real Spectrum's MIC port to the audio out port of a Sou…
... loading on my toast rack 128.
We could do ... the input impedance of the ULA pin is). This means the ... a lot louder at the ULA input pin (about 50% of ...
