-
Heatsink's for ZX SpectrumAre heatsinks usefull for the chips are used in ZX Spectrum's On eBay I saw some heatsinks for ULA's, 3 for +/- 8 dollar's. And I want to know are th…
... I saw some heatsinks for ULA's, 3 for +/- 8 dollar ... .
The ULA does run hot, but ULA failure is not ... type (it is not a ULA) and does not need any ... Spectrum.
[I][B]Mark[/B][/I] -
128+2 Help!Today the postie brought me an early Spectrum 128+2, it's a Z70700 Issue 1. Everything seems to be working ok, i.e it boots up and the keyboard work…
See also [URL="http://www.worldofspectrum.org/forums/showpost.php?p=492290&postcount=24"]here[/URL] for machine code to monitor the tape EAR port by reading the ULA and displaying on screen in the border.
[I][B]Mark[/B][/I] -
128+2 Help!Today the postie brought me an early Spectrum 128+2, it's a Z70700 Issue 1. Everything seems to be working ok, i.e it boots up and the keyboard work…
... EAR port by reading the ULA and displaying on screen in ... border.
[I][B]Mark[/B][/I][/QUOTE]
128+2 Help!Today the postie brought me an early Spectrum 128+2, it's a Z70700 Issue 1. Everything seems to be working ok, i.e it boots up and the keyboard work…
... /> Yes, code that reads the ULA "EAR" input will monitor the ... first.
[I][B]Mark[/B][/I]Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... . The normal one (which the ULA would use to produce a ... during the time that the ULA is not generating the display ... normal display, all before the ULA starts scanning the RAM again ... frames.
[B][I]Mark[/I][/B]Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... (just leaving the video circuits, ULA and the "lower" DRAM) and ... that is accessed by the ULA is contended, if this was ... access...?
[B][I]Mark[/I][/B]Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... time was to update the ULA display, there would not be ... code :-(
[B][I]Mark[/I][/B]Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... times...
[B][I]Mark[/I][/B][/QUOTE]
ULA and holding it's clock ... releasing it when the first ULA produces it's own interupt ...Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... if you use a Sinclair ULA, as the ULAs will operate ... relevant RAM. As the internal ULA normally supply the CPU clock ... work...
[B][I]Mark[/I][/B]Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... the clock to the second ULA and holding it's clock ... releasing it when the first ULA produces it's own interupt ... thinking :-)
[B][I]Mark[/I][/B]Why didnt 48k ingame music work?There were very few games that had ingame 48k music, a couple I can think of were Kung Fu Master and Manic Miner but it always sounded drained and no…
... constantly send data to the ULA to make a (crude) AC ... tune :(
[I][B]Mark[/B][/I]Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... data from ULA could be overridden.
[I][B]Mark[/B ...Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... the ZX81 special is the ULA, the ROM program code and ... 42.
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... of wire?
The ULA is responsible for the keyboard ... ports, so a faulty ULA can cause this fault. However ... it.
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... of wire?
The ULA is responsible for the keyboard ... ports, so a faulty ULA can cause this fault. However ... it.
[I][B]Mark[/B][/I][/QUOTE]
Hi Mark,
No, the RAM ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... pulsing low.
If the ULA is correctly producing interrupts, /INT ... data.
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... pulsing low.
If the ULA is correctly producing interrupts, /INT ... data.
[I][B]Mark[/B][/I][/QUOT
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... pulsing low.
If the ULA is correctly producing interrupts, /INT ... data.
[I][B]Mark[/B][/I][/QUOTE]
ULA. So what signal do you ... pin?
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... 16). This comes from the ULA. So what signal do you ... pin?
[I][B]Mark[/B][/I][/QUOTE]
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... 16). This comes from the ULA. So what signal do you ... getting, that part of the ULA is working okay.
[I][I][B]Mark[/B][/I][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... getting, that part of the ULA is working okay.
[I][I][B]Mark[/B][/I][/I][/QUOTE]
48k no beeper sound (again!)Got three 48k+ here, all of which have the same exact problem, no sound out the beeper, same problem as detailed [URL="http://www.worldofspectrum.org…
... " for every pulse that the ULA outputs a high on pin ... on the collector terminal. The ULA pin 28 voltage on diode ... 0.7V less (than the ULA pin voltage) on diode D9 ... voltages.
[I][B]Mark[/B][/I]Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... the relevant pins of the ULA and the connector should be ... think about it, was the ULA already taken out and inserted ... a poor contact on the ULA affect the data from a ... works...
[I][B]Mark[/B][/I]Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... .
It's not the ULA, as this has been tested ... pull-up resistors ("resistor test Mark suggests in schombi's thread ... types?
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... of IC23 to +5v as Mark suggested earlier in the thread ... connectors.
Swapped the ULA and tried again. Same as ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... />
Test between IC1 (ULA) pin 33 and edge-connector ... />
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... />
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... />
Test between IC1 (ULA) pin 12 and IC2 (Z80 ... INT).
[I][B]Mark[/B][/I]Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... />
Test between IC1 (ULA) pin 33 and edge-connector ... />
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... />
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... />
Test between IC1 (ULA) pin 12 and IC2 (Z80 ... INT).
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... />
Test between IC1 (ULA) pin 33 and edge-connector ... />
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... />
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... />
Test between IC1 (ULA) pin 12 and IC2 (Z80 ... INT).
[I][B]Mark[/B][/I]Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
Hi Mark,
Answers:
Test between IC1 (ULA) pin 33 ... ]
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... ]
Test between IC1 (ULA) pin 33 and IC2 (Z80 ... ]
Test between IC1 (ULA) pin 12 and IC2 (Z80 ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... ;767251]Test between IC1 (ULA) pin 33 and edge-connector ... schombi;767251]Test between IC1 (ULA) pin 33 and IC2 ( ... schombi;767251]Test between IC1 (ULA) pin 33 and IC2 ( ... schombi;767251]Test between IC1 (ULA) pin 12 and IC2 ( ... .
[I][B]Mark[/B][/I]
