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48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... a 48K Spectrum where the lower 16K RAMs are removed. Then the ... -
The Great Escape disassemblyHi, Over the past few months I've been steadily chipping away at reverse engineering Denton Designs' classic 48K title, The Great Escape. I'm now a…
... character set starting 256 bytes lower in memory. So when you come ... -
Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …
Afraid I dont have an oscilloscope Zorn (wouldnt know how to use one anyways!) BUT, I checked the lower RAM wrongly, these are the readings on all lower 16k
Pin 1 0.12v
Pin 8 0.15v
Pin 9 5v -
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... interested in some of your 16K memory boards.
Most of my ... 16K and 48K Spectrum's have ... in need of some "replacement 16K RAM" ;)
[I][B ... -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... anywhere. However, none of the lower RAM chips are heating up ... the system is working (including "lower" 16k DRAM).
What we don ... or ULA?
Problem with "lower" 16k DRAM?
Problem with ULA ... /> Another question, is this a 16K or 48K board?
48k Rubber Key Spectrum ProblemI'm testing my mate's spectrum that hasn't been used since the late 80's. Unfortunately, it seems to keep randomly resetting itself (like pressing th…
... enough I found that the lower 16K (4116 chips) sometimes need a ...Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…
... the classic faulty or no "lower" 16k 4116 DRAM image.
This ...ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…
... Spectrum to use only the lower 16K of RAM. The output of ...SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…
... up enough room in the lower ROM to add the ... is virtually identical to the lower ROM, any routine where I ... the upper ROM call the lower ROM frees up more space ... will only exist in the lower ROM. That should free up ... is a 32K ROM, the lower 16K ROM still works as a ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... a certain number of bytes lower in memory to make room for ...Video failureHi i cant find the failure of my spectrum 48k issue 4a, i thought it was ic6 or ic13 but the memory seem to have the right values. When i turn it on…
... Spectrum to use only the lower 16K of RAM. The output of ...Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... it'll start as a 16K Spectrum. If not and in ... Spectrum to use only the lower 16K of RAM. The output of ...Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... it'll start as a 16K Spectrum. If not and in ... Spectrum to use only the lower 16K of RAM. The output of ...Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... it'll start as a 16K Spectrum. If not and in ... Spectrum to use only the lower 16K of RAM. The output of ...Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
... running again, but only with lower 16k RAM.
I tried to ...128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…
... page the top 16K of Spectrum memory on the 128K ... the 16K that held it into the top of memory to ... of all of the 16K memory banks suffer the same ... ) all four uncontended (fast) memory blocks, but with no way ... developers used the 128K memory as little more than ...Migration to NemoBus ideology[B][U]Migration to NemoBus ideology.[/U][/B] Unfortunately all modern western hardware design is based on an outdated ideology bus, which was establ…
... that gets paged into the lower 16K of address space. This is ...really dumb questionbut can I use the following line to create a udg and if so how do I call it or use it via the graphics mode? Do I need to READ something somewhere? …
... following banks need to be lower in memory? I don't even ..."Freezes" on program loadingHi! I have ZX Spectrum+ (Issue 6A), and recently it has started to freeze w/o returning an error (but keyboard works) on program loading, regardless …
... the machine stack in the lower 16K (unless you then try and ... ). You can try loading a 16K game at this point.
48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …
... 2 boards).
[*]6C001E-6: Lower power version, alters colour burst ... reliability of access to the lower 16K of RAM. Found on Issue ...48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …
... 2 boards).
[*]6C001E-6: Lower power version, alters colour burst ... reliability of access to the lower 16K of RAM. Found on Issue ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... vertical sync on RGB and 16K memory are gone and everything looks ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... the issue or did you replace lower RAM also?
Just ...UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…
... can point to anywhere in memory. The high byte of this ... interpreter to leave the upper memory alone. This value is 65367 ... addresses to be 256 bytes lower:
[CODE]
30 ... be 1 lower, which relates to 256 bytes lower in memory:
[CODE ...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…
... 'd probably be easier to replace just that one. I've ... up and I plan to replace the TR4 with a 2SD1207 ... .
Any modules to replace the upper memory ?
Thanks all ...Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…
Enjoyed the Ben Heck episode, though trying hard not to moan about him calling the lower 16k video ram, the ULA the video chip, and him not knowing about the DivIDE and it's offspring when it comes to tape loading.ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... . It's 4164s. Normally the lower 16K is 4116 ram. These two ... less likely to fry the lower ram if TR4/TR5 blow ...Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]
... with a fault in the lower 16k meaning it cannot boot. May ...ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... a switching regulator and internal 16K memory.
A second ZX ... 2C184E and all chips except memory are socketed.
Its ...
