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48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... now managed to get the memory test program to load.
Lower memory test failed after a few ... .jpg[/IMG]
The upper memory test I also ran a ... -
48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... 48k machine.
Ran the upper memory test again and ran through ... perfectly.
However! Ran the lower memory test again and it failed ... up the screen corruption and lower memory errors go away.
Monkey Island On Speccy...I would love to see Monkey Island on the speccy...think it can be done...not as much detail or graphics...but along the same story lines.... What ot…
... , would require:
- A Spectrum 128K/+2/+3 (at a given time ... have to be available in memory, and AY sound is cool ... in an original unmodified Speccy (128K), provided it has a supported ...Bug fixing woesGaahhhh! I've spent an afternoon off work agonizing over why my routine didn't work. It's something I'd already restarted so didn't want to wipe th…
... poked to a place in upper memory that wasn't being used ... days ago when the 3.2.1.Go! routine stopped working ... routine to print the 3.2.1.Go! graphics had walked ...important Harlequin modWhile searching for a better solution for avoiding undesired spikes that corrupt the screen RAM at Harlequin I found a final solution. No additional …
... me why the design uses 2 32K RAM chips instead of ... because (the lower) one is containing the video ("contended") memory that has ... Therefore access to the higher memory is faster.
So is ... /> Only 16kB of the lower (video) memory chip are used. By changing ...ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... buzzer and with a magnifier (lower and upper memory) and couldn't find ...Bomb Munchies - preview releaseBomb Munchies Preview release Version 12th Jan 2014 [URL=http://s979.photobucket.com/user/MatGubbins/media/bmsix_zpsc33279a2.gif.html][IMG]http://i…
... and trying to save on memory, and fixing a few stupid ... been tested on my Spectrum 128K +2 (grey) and is working with ...48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... on some pins of the lower and upper memory chips (some 0.5V ...64k speccydoes anyone have instructions on how to use the extra 16k found in some spectrums?
... DRAM chips used for the "upper" memory are not actually faulty.
upper" memory area.
If ... want to increase the available memory, it requires modifications to the ... bytes comes from 16k bytes "lower" RAM plus two banks of ...Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…
... memory matrix contained within it.
Ironically, a 48k (or 128k ... single 4116 DRAM to the upper memory area. Whatever way you go ...Shadow of the Unicorn loader for +2A / +3hi, i have tried to load SotU with the [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0023000"]RAM loader from Fraser Ross[/url], which is l…
... [/u], [u]1[/u], [u]2[/u], [u]3[/u]] but ... memory in the other two banks.
On an ordinary 128K/+2 ...Composit output on +2 and +3?I recently got hold of a dvd recorder for the purpose of recording speccy gameplay. It turns out that this particular recorder is not compatible wit…
... 'd pop open my grey 128k+2 since this mod seemed simple ... ), so I've cut the lower wire that connects to the ...Why no Sinclair if 2 support on modern hardware?Another wonder :) I appreciate that most games support Kemptson joystick so this joystick interface is used in modern hardware (Spectre/DivIDE et…
... , the +3 and black +2 have their memory bus multiplexing all done ... are fitted on the +2 grey, the +2 black and the +3 ... 16k/48k/+ machines and the 128k+ (toastrack), but you can use ...New Game: Tourmaline[img]http://www.retrosouls.net/zx/trml1.jpg[/img] Dive into caves full of crystals and enemies! Be like a rock star! [img]http://www.retrosoul…
[quote="R-Tape;864008"]Ta. Great game, music, graphics (not tempted by bicolour for this one?).
[/quote] Thanks! Nirvana scroll will be slow and complex. I need 2 Nirvanas in memory to hide redraw and second screen from 128k machines.Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…
... a failure across all of lower/upper RAM.
Are you ... actually healthy for an Issue 2, I've seen some as ...ZX Dandanator! Mini - Cartridge system for SpectrumsHi All, I'd like to present a little HW I've developed during the last three months. It's aimed at providing a console-like usage experience for a…
... the Video connector in a 128k +2/+3, but it does not ... is the board on a 128k +2a
[img]http ... Joystick connector options on the upper-left
[img]http ...Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... issue 2 I recently got, it eventually had several upper memory ... faults, ended up replacing the whole upper memory but ... 10/11 which chooses memory type was left unconnected, ... and bodged, got a upper memory kit from Retroleum replaced ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... the underlying reason for the memory contention.
... sinclair/technical-docs/ZXSpectrum128K_TechnicalManual.pdf]128K Technical Service Manual[/url] ... in banks 0 & 2 it would seem logical to ... /+3 machines. For the 128K/+2 machines banks 4 or 6 ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... you need to distinguish between 128K/+2 from +2a/+2b/+3 is ... does not require filling two memory pages with nonsense. Note that ... contains the number of required memory page (0..7)
; A ... over what goes into contended memory and what goes into uncontended ...ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…
... logging/file logging. Write to memory from debug expression to set ... debug test cases
[*] [b]128K[/b] aware - keeps everything in ... labels, calls and jumps)
[*] 128K-enabled [b]tape file generator ... exact timings for 48K and 128K/+2 grey (not +2A/3)< ...Speeding up PRINT code in ROMHi Folks, I seem to recall that someone stated the PRINT command is rather slow because it has to handle screen and printer printing - is this cor…
... UDG character to be printed (upper case),
;; DE contains row ... points to start of display memory
ld a,d ; Row ... multiply
rrca ; by 2
rrca ; Upper three binary digits
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... 48K (and I presume the 128K/+2) machines. This may explain why ... a HALT in the contended memory area, which works more or ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... . Of course, port contention (and memory contention if such instructions are ... behavior, nor the “standard” 48K/128K/+2 behavior should lend itself to ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... behaves differently from the 48K/128K/+2. The key differences are listed ... 5, 9, 13 . . . 4093)
2. The bus always returns $FF ... was last read from contended memory (usually, the last attribute byte ... the case on the 48K/128K/+2.
That’s the ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... was last read from contended memory (usually, the last attribute byte ... /128K/+2.
[/quote]
5. Reading and writing from/to slow memory ... the last operation with slow memory (pages 4,5,67) by ...Bomb Munchies - preview releaseBomb Munchies Preview release Version 12th Jan 2014 [URL=http://s979.photobucket.com/user/MatGubbins/media/bmsix_zpsc33279a2.gif.html][IMG]http://i…
... 1 press A
Player 2 press S
Player ... to use Sinclair 1 and 2 with Kempston 31.
... -Con works with interface 48k, 128k, +2 grey only)
b) ... , it did, but when 2 or more players were on ... showing a glitch in the lower part of the player ...Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... 's a difference in the memory contention pattern that it may ... working, tweaked the timing for 128K/+2, then found the +2A/+3 ... memory on a 48K and 128K both restrict a memory read / write to 2 ... function that writes to contended memory with alternate gaps of 7 ...Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
First it does some contended memory writing, counting as it goes. ... speeds of the 48K and 128K, and something with no contention ... tell if it's a 128K/+2 or +2A/+3.
Why can't you make a BASIC program as big as you want?Let me rephrase that. Is it possible using BASIC to write a program that can be multi part? In other words one that can LOAD lets say a story, in se…
... your main program A, saving memory for another part and using ... MERGE Program C (the part 2).
There are some ... to fill them in memory.
- Using upper memory to store the levels ... it will need some more memory to doing the "merging" process ...
