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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 …
... issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and ... can do about a), but maybe a problem in the ULA could cause ... the great book "The ZX Spectrum ULA: How to design a microcomputer"
- U and V continue ... -
ZX Spectrum 48K clone and test resultsHi! This is my first post, so, first of all, I'd like to say hello to the whole community! I am Alessandro Dorigatti from Italy and I'm developing …
... , I'd like to say hello to the whole community!
a new ZX Spectrum 48K clone based ... "The ZX Spectrum ULA: how to design a microcomputer"; I'm really trying to emulate the machine ... />
This appears to be a problem with the even port ... -
ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …
... schematics described in "The ZX Spectrum ULA: how to design a microcomputer" book by Chris Smith
to the ULA
- 3 CPU speed ... ; PAL ULA, VGA 60HZ => NTSC ULA)
At today, to boot ... -
ULA Price Poll - You get to chooseIt is difficult to set the price of the book. If it is too low I will undersell my efforts, too high and I overcharge. So choose what you would be w…
... , all that is required to design and implement a microcomputer (ok an '80s one ... more complex). Topics like how to generate a picture on a TV, with [u ... title "The ZX Spectrum ULA: How to Design a Microcomputer"
You get a whole lot more ... -
ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…
... that it'll be accessible to a general audience. As quoted ...
[quote]"The ZX Spectrum ULA: How to design a microcomputer" is pitched to be readable by the ... readable by anyone with a general interest who can ... -hardware fan or just a piece of shelf-candy for ... -
ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…
... message:
* The ZX Spectrum ULA: How to Design a Microcomputer
* Video Gaming ... /> * Core Memory: A Visual Survey of Vintage Computers ... /> . . .
* The ZX Spectrum ULA: How to Design a Microcomputer
by Chris Smith ... -
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…
... One roadshow?) about the ULA and some of its idiosyncrasies ... writer. I ordered a copy of 'The ZX Spectrum ULA: How to Design a Microcomputer' Book. It ... arrived on Saturday.
So I spent a ... -
ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …
The ULA video output pins are pins ... /> For detailed information on the ULA and how it works, read the ... .zxdesign.info/book/"]"The ZX Spectrum ULA: How to design a microcomputer"[/URL]
[I][B ... -
Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…
... Smith's book, 'The ZX Spectrum ULA: How to Design a Microcomputer' upon which much of my ... ). A less efficient design would need to stop the CPU completely whilst the ULA ... the Spectrum, each successive DRAM row tends to deal with a different display ... -
Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…
[QUOTE]Not sure how much you're ... 's accessible to all! I'm not a hardware bod ... this in a way that makes sense to the rest ... s book, 'The ZX Spectrum ULA: How to Design a Microcomputer' upon which much of my ... /> I was with you up to about there :lol:
... -
Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url], was in the ... process of mimicking an ULA with a FPGA device, but I ... that I wouldn't mind to test and eventually produce boards ... />
I have quite a few to fix my self :) -
Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url], was in the ... process of mimicking an ULA with a FPGA device, but ... sure if there is a [url="http://www. ... to [url="http://www.zxdesign.info/ulaReplacementWorks.shtml"]successfully replace a ULA ... -
Is there a ZX Spectrum Hardware manual?I'm quite new to the ZX Spectrum world, looking for a definitive guide to the ZX Spectrum hardware so I can really start to understand what's going o…
Get hold of a copy of "The ZX Spectrum ULA: How to Design a Microcomputer" by Chris Smith. Published ... in 2010, it's a modern ... -
Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…
... .info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url] goes into great ... Spectrum video system. It includes the method that the ULA uses to ... signals (the 16k/48k ULA did not output RGB ... converts the YUV signals to a composite colour signal, which ... -
Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…
The blue output was altered during the Spectrum's design phase. At least I think that is what is said in the book [url="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url].
[b][i]Mark[/i][/b] -
ZX Spectrum video waveformsAll work for this post was done on a ZX Spectrum issue 1 board (16k bytes of RAM only). This was what the Spectrum displayed on the TV screen: [i…
The blue output was altered during the Spectrum's design phase. At least I think that is what is said in the book [url="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url].
[b][i]Mark[/i][/b] -
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 …
... you trying to say that every emulator written for the Spectrum is ... inaccurate and incorrect regarding screen timings?
Add to ... 's excellent book "The ZX Spectrum ULA: How To Design A Microcomputer" is also incorrect as it ... -
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 …
... you trying to say that every emulator written for the Spectrum is ... the border chunk that the ULA started to draw at tick 11872 ... 's excellent book "The ZX Spectrum ULA: How To Design A Microcomputer" is also incorrect as it ... -
Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…
... voltage that ULA uses to extract edges? I'm reading ZX Spectrum documentation ... the ULA that Sinclair used, it is possible to select from a small ... on the signal. “The ZX Spectrum ULA, How to Design a Microcomputer” book gives the input threshold ... -
How to convert a .txt file (ASCII/PC) into a Tasword file?Short version: [B]How can I convert a .txt file (PC) into a Tasword file (ZX Spectrum)?[/B] Longer version: {Maybe I should first re-introduce mysel…
... 's and a 128k. It is fascinating to see how kids react to a Spectrum. They ... on page 22 how to convert a Tasword file into a .txt file that ... way round: [B]how to convert a .txt file into a Tasword file (Tasword ... -
How to write a simple BASIC* horizontal scrolling game (Tutorial) [b]How to write a simple BASIC* horizontal scrolling game[/b] In this tutorial, we will be talking about how to write a simple BASIC* horizont…
[b]How to write a simple BASIC* horizontal scrolling game ... we will be talking about how to write a simple BASIC* horizontal scrolling ... : FOR a=60000 TO 60021: READ p: POKE a,p: NEXT a
... coordinates (y,3)... Remember the spectrum basic has its Y coordinate ... -
How to write a simple C+asm horizontal scrolling game (Tutorial, z88dk)[b]How to write a simple C/asm horizontal scrolling game[/b] [b]Note:[/b] This tutorial has multiple parts... I am still writing but this first pa…
[b]How to write a simple C/asm ... take some time to get it to work properly, so ... This is just a simple batch file to start compiling your ...
[b]A) Drawing a scrolling screen[/b]
to the subroutine called "scroll_left()", ... -
How to write a simple game in C+asm.This is just a link to an old post in Development, about a post of making a simple game in C for the Spectrum. It was suggested that this thread shou…
... of making a simple game in C for the Spectrum. It was ... ://worldofspectrum.org/forums/discussion/57925/how-to-write-a-simple-c-asm-horizontal ... ://worldofspectrum.org/forums/discussion/57924/how-to-write-a-simple-basic-horizontal-scrolling ... -
Spectrumpedia revised and extended edition. Suggestions about possible new contentFor the 40th anniversary of the first launch of the Spectrum, I am going to revise the Spectrumpedia. Feedback was very positive, although the fact t…
... first launch of the Spectrum, I am going to revise the Spectrumpedia ... ]To be updated[/i]
Confirmed existence of the ZX Spectrum +3B ... , Chris, [i]ZX Spectrum ULA, The: How To Design A Microcomputer,[/i] ZX Design and Media, Dinas Powys ... -
ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …
... />
Is there a good description of how the ULA reads from video ... .zxdesign.info/book/"]The ZX Spectrum ULA [I]How To Design A Microcomputer[/I].[/URL]
It ... explains how (and why) the ULA interfaces ... -
ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …
... .zxdesign.info/book/"]The ZX Spectrum ULA [I]How To Design A Microcomputer[/I].[/URL]
It ... explains how (and why) the ULA interfaces with ... used inside the ZX Spectrum but using a YUV -> RGB converter ... -
How to get a minimal splib2Hello. We are designing a new engine and stuff, coded in ASM and to be used from z88dk. I was just wondering how to get a minimal splib2 with just th…
... designing a new engine and stuff, coded in ASM and to be ... . I was just wondering how to get a minimal splib2 with just the ... /Keyboard related routines get added to the binary? Or do I ... have to do anything fancy?
How to stop a flickering character erasure?I'm trying to figure out how to build a moving sprite. Eventually it will be made up of several UDG's. However its early days yet so I'm experimentin…
I'm trying to figure out how to build a moving sprite. ... I'm experimenting with a character that moves by ... the character to flicker, is there a way to avoid this ... ?
5 FOR x = 0 to ... 20 STEP 1
10 PRINT AT 0, x; "A ...Strangely, I just can't STOPOK, I bought an RWAP keyboard matrix and put it in my Spectrum+ last night (ta), I did the Swedish composite mod with a capacitor, I fixed the missin…
... is this, it's strange how I can still detect the ... readings for reporting one keypress to the editor. This could explain ... /> @mcleod-ideafix: The coming ULA book ("How to design a Microcomputer") might shine some light upon ...What is the Sinclair ZX Spectrum Vega and what does it mean?Just stumbled upon this Indiegogo page following a tweet from SpeccyNews [url]https://www.indiegogo.com/projects/sinclair-zx-spectrum-vega[/url] it…
... it refers to the Elite 'recreated Spectrum' in comparative terms to the Vega ... . Is it actually a product ... one of the talks related to his 'How to Design a Microcomputer', and so it's ...
