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Spectrum not booting up properlyI picked up an old Spectrum from a car boot sale today, but the keyboard was acting up. I took it apart to see what the problem was, but after puttin…
I'm not an expert but it I reckin the ULA is knackered.
This can happen by fiddling with the power supply, I speak from experience... -
On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... T states spent by the ula drawing borders before the byte ... -
On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... AA says just wait until ULA start drawing pixel part of ... is way how recognize if ULA is drawing border or pixels ... -
Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…
... is pulled low by the ULA 14336 (on the 48K machine ... -
Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…
The PC-Engine had several other processers working PURELY just to output graphics and sound. The Spectrum had it's Z80 CPU, the ULA and a Beeper. THis is where the differences lie. -
Where to get Speccy bits and pieces...Hi everybody, My poor little 16K Speccy is begging to be fixed but I think the ULA has given up the ghost - when I power it on the screen stays the …
... Speccy to get the right ULA as the 5C102 is quite ... -
Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…
... that is shared among the ULA, CPU and disk and only ... -
If you could re-design the Spectrum...Let's suppose you could go back in time to the beginning of the Eighties. The Spectrum is being designed as the revolutionary successor to the alread…
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You'd need the ULA to act as a tone ... set an oscillator on the ULA to output these 0's ... . That is, you tell the ULA what frequency tone you want ... -
If you could re-design the Spectrum...Let's suppose you could go back in time to the beginning of the Eighties. The Spectrum is being designed as the revolutionary successor to the alread…
... :
You'd need the ULA to act as a tone ... set an oscillator on the ULA to output these 0's ... . That is, you tell the ULA what frequency tone you want ... -
If you could re-design the Spectrum...Let's suppose you could go back in time to the beginning of the Eighties. The Spectrum is being designed as the revolutionary successor to the alread…
... modes? Perhaps swap the Spectrum ULA with a Timex one (or ... -
If you could re-design the Spectrum...Let's suppose you could go back in time to the beginning of the Eighties. The Spectrum is being designed as the revolutionary successor to the alread…
... 've still got the Timex ULA, with the difference that implies ... -
Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
... international incompatibilies. It is the ULA that has the master 14Mhz ... again for 3.5Mhz. The ULA provides the INT signal at ... Timex machines). It is the ULA that produces the TV picture ... -
Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
... international incompatibilies. It is the ULA that has the master 14Mhz ... again for 3.5Mhz. The ULA provides the INT signal at ... Timex machines). It is the ULA that produces the TV picture ... -
Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
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[quote]It is the ULA that has the master 14Mhz ... again for 3.5Mhz. The ULA provides the INT signal at ... Timex machines). It is the ULA that produces the TV picture ... single oscillator attached to the ULA. On the PAL Spectrums (and ... -
New member, dead SpeccyHallo everyone, I was directed here from a Commodore (boo, hiss) forum after pleas of aid with my newly acquired, quite dead 128k Speccy. I sincerely…
[quote]
On 2004-12-16 20:30, idrougge wrote:
I've got replacement CPU and memory, but if it's the ULA that's been blown to pieces, will a 48k one do for a replacement?
[/quote]
No. -
Fuse 7.0 installJust installed slackware 10, and now having trouble installing Fuse, or rather libspectrum, haven't got to the fuse part yet. Missing a library some…
... .o ui.o uidisplay.o ula.o utils.o zxatasp.o ... -
Fuse 7.0 installJust installed slackware 10, and now having trouble installing Fuse, or rather libspectrum, haven't got to the fuse part yet. Missing a library some…
... .o ui.o uidisplay.o ula.o utils.o zxatasp.o ... -
Screen AttributesNot sure if this is a devolopment question but here goes... In my limited understanding, the 'attribute file' of a speccy is 5800h to 5AFFh and each…
... interpreted (other than replacing the ULA with something else.)
ULA reads that value. -
Screen AttributesNot sure if this is a devolopment question but here goes... In my limited understanding, the 'attribute file' of a speccy is 5800h to 5AFFh and each…
... interpreted (other than replacing the ULA with something else.)
[/quote ... -
Screen AttributesNot sure if this is a devolopment question but here goes... In my limited understanding, the 'attribute file' of a speccy is 5800h to 5AFFh and each…
... file is interpretted by the ULA hardware, but what you can ... the display file while the ULA reads it to get > ... -
SPIN betaHello. This is my first message in this Forum, so excuse my bad english as it is not my main language. I would be extremely grateful if somebody cou…
... 3 spectrums, which affects the ULA port ($FE) which is used ... -
K-MOUSE gamesDo you want to control speccy games by mouse? Now you have the chance! At [url="http://zx-spectrum.wz.cz/index.php?pg=rubriky%2FZpravy%2Fk-mouse.php…
... including the interrupts and the ULA's contention effects, which does ... -
SPIN betaHello. This is my first message in this Forum, so excuse my bad english as it is not my main language. I would be extremely grateful if somebody cou…
Looks like Spin is emulating the ULA-gone-bust problem perfectly! :)
But seriously, not sure why this should be happening, but check if emulation isn't paused or something. -
Spectrum programmingI have a Spectrum+ at home. I tried to write some programs in BASIC (IIRC i wrote a breakout clone in which you had to hit those spider-like characte…
... just the idiosyncrancies (like the ULA timings etc) that make it ... -
UncontendedThis may be a real daft question as I consider myself to be a bit of a programmer, but <deep intake of breath> here goes... When refering to memo…
It means the Z80 isn't fighting with the ULA for access to the memory. -
Does ScanLine[0] have a left border?My emulator couldn't handle Cobra or ShortCircuit so I added some rough port FF values. I now want to make it a bit more accurate. The FAQ gives me a…
... ?
[/quote]
The ULA will be outputting the current ... -
128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…
... to the RAM. Since the ULA doesn't need the Z80 ... -
128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…
... think I'm confusing a ULA memory read with a Z80 ... it via Memory[16384]. The ULA does the same thing but ... least 7 tstates but the ULA can load a screen attribute ... -
128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…
... think I'm confusing a ULA memory read with a Z80 ... it via Memory[16384]. The ULA does the same thing but ... to each other for the ULA and Z80. Connect the buses ... least 7 tstates but the ULA can load a screen attribute ...
