-
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... the original chips in the +2.
In the 48K ... /> And as the Z80 and upper memory control logic (40058 / PCF1306 / ZX8401 ... ULA chip) of the +2 is equal to the 48K ... -
What do you think about Unreal Speccy Portable?Hi, spectrumers! Just wondering about subj. Unreal Speccy Portable has been ported to Windows/Linux/Mac/Symbian/Dingoo A320/Caanoo/WIZ/Android/PSP/…
... ZX Spectrum clone without contended memory) timings. Animation in some ... ]>Development for 128K needs more memory than just 128K.
And ... how much memory is needed ... " or "Myth" or "Last Nynja 2" ? -
20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…
... 712065]I realise that the lower / upper border is the only opportunity ... . Implementing game logic during upper border is a real nightmare ... />
In BIFROST*, the upper border is normally used just ... since last year for a 128K multicolor renderer. Perhaps it ... -
A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…
... ' CF card system, the much lower current draw of the IF1bis ... IF1bis to work on my 128k +2 (which previously had given a ... -
Kiss Kill - a Spectrum music video from Candy Says and GasmanYou may remember [url=http://www.worldofspectrum.org/forums/showthread.php?t=43068]the preview[/url] of this from back in March - here's the final re…
... 128K pages are contended. I filled up the usual 32K of upper memory ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... restart.
Removed all lower RAM since it was soldered ... see if I have an upper memory problem also. I shall finish ... -
Kiss Kill - a Spectrum music video from Candy Says and GasmanYou may remember [url=http://www.worldofspectrum.org/forums/showthread.php?t=43068]the preview[/url] of this from back in March - here's the final re…
... 128K pages are contended. I filled up the usual 32K of upper memory ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... . You can even bypas the lower bound of this equation and ... . When I try it with 128K+2 it didn't work until ... -
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…
... some kind of memory allocation?[/QUOTE]
lower memory, and
' only decompressed to either screen or upper memory ... as needed. This way, the
' same memory ... located in contended memory, thus leaving uncontended memory available for< ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... contened zone (writing to contended memory from uncontended buffer), only the ... blocks of data into contended memory (typically from buffer to screen ... /> No. In Spectrum 48K and 128K/+2 models, the contention pattern for ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... br /> ld a, 2 ; use upper screen
call chan_open ... ld (sposnl), bc ; for lower
ld (echo_e), bc ... -
Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …
... circuits by the way - the lower memory gets refreshed for free merely ... generate the screen picture, and upper memory is refreshed by the Z80 ... -
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 ... ,128,64,162,28,0,-2
20 LET a=USR ... -
New games - should they be 48K or 128K?Here's a question for new games - which machine should they be developed on? If I write a game for the 48K Spectrum, is it appreciated that it will …
... bits[/I] that the 128k could use. In fact, ... of the sound and extra memory. Carrier Command on a ... I was duped by '48k/128k/+2' stuck on a label, ... on lesser memory. If they were made into 128k version's ... with a 128k Soundtrack. Also the first 128k soundtrack I ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... . I measured voltages from the lower memory and got pretty much zilch ... /> A few days later, the memory chips and the BC557 arrived ... socket joints and changed the upper memory RAM chips and I am ... -
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…
... /> So does this mean my upper memory died ?
I swapped ... .
Tomorrow I will get 2 more 74LS157's as it ... -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... the track to isolate the upper memory. It did'n help (maybe ... /> This also proves the 16K lower memory is working, and this issue ... -
eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …
... SCART for 128K is not suitable for 128K+2 gray, since +2 has already ... cables including RetroComputerShack are marketed 128K/128K+2(gray).
Do they ... using a microcontroller with some memory to build a HDMI ... could be adapted for the 128K machines (I've had ... -
THE HOBBIT loading screenHello again, thought I'd have a go at an alternative loading screen for The Hobbit. [IMG]https://dl.dropboxusercontent.com/u/61658082/THE%20HOBBIT%…
... version of The Hobbit for 128k, with the replacement of vectorization ... on the picture of the upper memory.
To begin replacing all ... -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... 769691]To disable the "upper" 32k of RAM, take a ... . That will disable the "upper" RAM, as the CAS signal ... How to proceed? As the upper memory (or the logic IC's ... I] or [I]which upper memory chip is gone[/I]? I ... because of brand and upper half or lower half. Or do ... -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... determine with reasonable confidence which upper RAM chip(s) have ... say something about the whole upper memory and even more specific ... a potential broken upper memory chip, by just checking ... byte of the extended memory, as the lower RAM is 16K ... -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... say something about the whole upper memory and even more specific a ... potential broken upper memory chip, by just checking one ... byte of the extended memory, as the lower RAM is 16K and ... 32768-65535.
An upper RAM chip might have failed ... -
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…
Okay replaced both faulty lower ram ic.
Now I get a white border and random looking inside it.
Same with disabled upper memory, and no keyboard.
So what does this mean ?
More dead lower memory chips ? -
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…
... RAS/CAS signals on each lower RAM chip in turn (pins ... third bad lower memory chip and swapped it.
And with upper memory disabled ... step is finding the bad upper memory chips :D
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…
... third bad lower memory chip and swapped it.
And with upper memory disabled ... step is finding the bad upper memory chips :D
I ... /> So guessing one of the memory chips is holding output high ... -
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…
Are all upper memory IC's socketed at this ... could try removing all the upper RAM, and reintroducing it one ... same troubleshooting methods as with lower RAM - watching the RAS/CAS ... -
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…
[QUOTE=balford;776008]Are all upper memory IC's socketed at this ... could try removing all the upper RAM, and reintroducing it one ... same troubleshooting methods as with lower RAM - watching the RAS/ ... I will have more dead lower memory soon.
Guess I will ... -
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…
... , either in the upper or lower RAM area
2) Faulty upper RAM
lower RAM positions in another Spectrum ... -
Interfaces & ROMsHi everyone, I'm currently looking into the various modern interfaces for the Spectrum to allow me to run all my games from an SD card. I have a few…
... ROM chip back into the memory map.
Any test ... ROM cartridge slot (Sinclair Interface 2, RAM Turbo etc).
upper memory fault, but it still works ... -
Spectaculator BlogHi All, I've decided to start a Spectaculator development blog [URL="http://www.spectaculator.com/category/blog"]here[/URL]. Normally months (somet…
... .php?p=710667&postcount=2[/url][/QUOTE]I think that ... /faq/reference/formats.htm]"The 128K version of the .sna format ... to include the extra memory banks of the 128K/+2 machines, and fixes ... used to switch to 128K mode for 128K snapshots, but if the ...
