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Successfully updated Issue 2 48k to 128k?Thanks to the donation by PMSR and through the very patient teachings of Velesoft, I have updated the Issue 2 to work with 128k. However. I have yet …
... AY chip, a 14 Mhz oscillator module, and I can add ... -
Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…
Can anyone recommend me a very small 14 Mhz oscillator so I can a clock signal to my AY chip? -
Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…
... to be a 14 MHz oscillator? I thought you were dividing ... 7MHz crystal. To make the oscillator you just need a NOT ... difficult to build a stable oscillator. Remember that the AY itself ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
This is really amazing work. Among other things I appreciate the extra video output possibilities. The AD724 would be in that spot next to the crystal, correct?
/Pedro -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... lot easier and with the AD724 the composite video generation problem ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... lot easier and with the AD724 the composite video generation problem ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... poorer than that of the AD724.
Depending on the used ... that uses the AD724 I found. Nethertheless the AD724 allows a simple ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... poorer than that of the AD724.[/QUOTE]
Well the ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... 17.7345MHz from a 50MHz oscillator. If it's not the ... have to find a SMD oscillator with that frequency (or integral ... multiple of it), orremove the oscillator and route the master CLK ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... works ok, and the 50MHz oscillator is... oscillating :D . -
Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…
[QUOTE=Knik;650109]
But you made a "real" 128K ?[/QUOTE]
Yes, I did. I am just waiting for an oscillator and AY chip to arrive and it will also have sound like one :) -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... Platform ROM chip and the AD724.
[img]http://www.zxprojects ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... place, so it's the AD724. The platform ROM has given ... -
+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
... Composite Sync plumb up an AD724, colour encoding clock and some ... -
+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
... , and I will check the AD724 as well. I knew about ... -
+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
... I am 100%.
AD724 (I think it was that ... to a board with the AD724, that way the brightness control ... -
+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
[QUOTE=Johan1973;652888]
AD724 (I think it was that, ... to a board with the AD724, that way the brightness control ... .php?t=34306&highlight=ad724&page=3[/url] -
+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
... .php?t=34306&highlight=ad724&page=3[/url][/QUOTE ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... main CLK signal (the 50MHz oscillator clock). The output is taken ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... very long traces, a cristal oscillator (33MHz I recall) too far ... -
Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... CPLD given the right crystal oscillator (timing constraints notwithstanding). In reality ... -
Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... Spartan-6's voltage controlled oscillator operates between 400MHz and 1GHz ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... of these pulses confuse the AD724 chip, which is unable to ... . At first I thought my AD724 chips were damaged, but at ... :
To test the AD724, I've synthetized a small ... -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
I want to know how the pentagon did it now! :-)
What was the oscillator frequency? -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
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[QUOTE]What was the oscillator frequency? [/QUOTE]
Main ... -
Is the 128K heatsink's TV out modulator kit repairable?I have a 128K+ Spectrum that is working absolutely fine and is giving out the perfect picture from its RGB out socket (with the right cable ofcourse)…
How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…
... /> Just add SRAM and option AD724 for convert RGB to composite ...How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…
... /> Just add SRAM and option AD724 for convert RGB to composite ...Sinclair ZX Spectrum FAILS latest radio noise rules SHOCKCan I really be the first to have mention this? Article on El Reg reports: [url]http://www.theregister.co.uk/2012/12/13/sinclair_spectrum_fails_mode…
... are derived off the actual oscillator circuit. These are the carrier ...
