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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…
... DOS will help.The RAM test programs that ... themselves to RAM, execute the program in RAM and switch ... cartridge slot (Sinclair Interface 2, RAM Turbo etc).
RAM test always available.
16K (upper memory fault, but it ... -
Spectrum sometimes boots with graphic issuesA while ago, my Spectrum 48K (issue 3B) broke down after fiddling with a brand new joystick interface in combination with DivIDE. Today I tested the …
... . You might have an intermitent failure affecting all 4116 chips, or ... an intermitent failure in the multiplexers that carry ... lower RAM chips.
One of your reboots show that upper ... -
Software for MULTIFACE 1, MF128, MF3Exist list of existing software which support multiface memory ? Here on WOS I search only some utilities: [URL="http://www.worldofspectrum.org/info…
... limit a 48k Spectrum into 16k RAM, at least as far as ... into the middle and upper 16k sections of RAM. Then afterwards, pressing the ... would simply shuffle those 16k sections of RAM along with the registers ... -
Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…
... power supply failure (the RAM chips that provide the lower 16K of memory ... or more of the lower RAM chips (these are at the ... ones. A modern replacement lower RAM board is also available if ... -
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…
... feasible to actually make a ram module replacement with ease?[/quote ... you run into an actual failure.
Once you're ... , try 16K*4 or 64K*4 DRAMs, or a lower RAM replacement ... -
Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…
... . But most likely still a RAM fault. As it appears you ... eleminated the lower 16k DRAM, that leaves the upper 32k DRAM.
Can you run a RAM test ... -
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…
... 256byte replica of the game upper 256bytes. It also contains menu ... copies memory dump subroutine to upper memory and allocates stack up ... . (Upper 256bytes)
Sets HL, DE and BC for first 16k of ram ... last slot (12) where only 16k-256bytes are copied to avoid ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... way of having external RAM in the 16k to 32k area. But ... be stored in the internal RAM as well it's normally ... would have to remove the "upper" DRAM chips. Or where they ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... says is "suitable for 16K,48K,128K and + ... socketed chips are facing). Failure to get the rom ... br /> 2) Ram disk.
The extra ram in the Spectrum ... -
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
... of memory (16k bytes ROM, 16k bytes RAM, optional 32k bytes RAM). What data ... work out how much memory (RAM) is fitted. It picks up ... />
Regardless of how much RAM it finds, there is no ... (see note below) in the upper half of the memory map ... -
Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... lower 16K of RAM has access speed issues and the upper 16K of RAM is ... -
Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…
... /> Remapping memory, be it RAM or ROM is relatively simple ... chips control the upper 32k of RAM. The board design ... RAM in it’s place, or just have part of the upper ... 32k having multiple banks. Say the top 16k ... board that upgraded a 16k or 48k ZX Spectrum ... -
New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... /> 2) Disable disk cache and RAM drive
3) Directly decompress ... type
1: force 16k. If known 16k game then force clear ... program counter and if in upper mem errors
2: force ... -
48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... the 2 between the upper and lower ram. It gave symptoms of ... , fall into the ‘renew on failure’ category.
Let me ... of a possible electrolytic capacitor failure, I’m not saying ignore ... the -5V rail will fail. Failure of the -5V rail may ... -
How Many Games Exist in Both 16K versions and 48K Versions ? I have found one ( Dallas (CCS) 1982 but there could be some more
... but the ROM version is 16K. Having said that I' ... on a 16K machine it may well use upper memory so ... I can confirm on a 16K machine the ROM cart for ... worried it might of used upper memory but it seems ... Inlay does say 16/48 RAM for the cart however. Interesting ... -
How Many Games Exist in Both 16K versions and 48K Versions ? I have found one ( Dallas (CCS) 1982 but there could be some more
... "]I can confirm on a 16K machine the ROM cart for ... worried it might of used upper memory but it seems not ... 16Kb machine (cause only 9Kb RAM actually available)? But the ROM ... -
If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…
... the ZX Spectrum BASIC ROM (16k bytes) and the diagnostic test ... an internal RAM expansion that gives a ZX Spectrum 16k/48k/+ (*) ... machine 80k bytes of RAM. It uses ... RAM.
(*) note that if your machine has it’s ‘upper ... -
Repairs and Reparing.Hi All, Just finished resurrecting an Issue 3A board. Had black lines, so replaced the lower 16K RAM chips, Amazed they just cost a couple of doll…
... need them replacing on failure.
For 16k/48k/+ models, the ... most common problems are a failure of ... DC converter circuitry. And a failure of either one or more ... , or a failure of one or more of the ‘upper’ (expansion) ... -
How to apart a 16K from a 48K?How can I understand that if i have a 16K or 48K? Thanks
... DRAM is fitted. Be it 16k bytes or 64k bytes.
RAM.
Use:
[code ... is a fault with the ‘upper’ / extension DRAM, this may be ... to work out how much RAM is fitted and it makes ... -
How to apart a 16K from a 48K?How can I understand that if i have a 16K or 48K? Thanks
... a 48k behave like a 16k.
Why was this necessary ... games that only run in 16K?[/quote]
I’m ... />
Disabling the the ‘upper’ / extension RAM is handy for fault finding ... to start up as a 16k machine, allowing access to BASIC ... -
How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement. Know what I found? My old ZX Spectrum.... Those were the days! Never …
... ZX81, though.
3K om RAM, my friends!
My question ... I tell what size of RAM I've got in my ... -
I have...I still have a working ZX-81 plus 16k RAM pack, still in it's box. I also have a ZX Spectrum 48k computer with the Sinclair Microdrive (plus Microdr…
... a working ZX-81 plus 16k RAM pack, still in it's ... -
Spectrum 16k and Printer for saleFor sale. Boxed Sinclair Spectrum 16k with manuals and original electrostatic printer with paper. Also I'll include any magazines and games I can fin…
For sale. Boxed Sinclair Spectrum 16k with manuals and original electrostatic printer with paper. Also I'll include any magazines and games I can find!
Make me an offer for the whole lot. I live in Reading UK. Regards, Andrew. -
Favourite 16K gameThe Spectrum had many classics, but few talk about the early 16K ones- they had a simplicity that the later 48K games traded off for technical depth,…
... few talk about the early 16K ones- they had a simplicity ... , and maybe atmosphere. My favourite 16K game is Deathchase, and it ... is everyone else's favourite 16K hit? -
Spectrum 16KI know there must be some of you that still use the original 48K rubber keys machine, and other that have the 48K+, or the 128K(me). But is there any…
... who still has a working 16K with a 32K rampack in ... -
Speccy bits for sale/swapBeen digging about in the attic today and found two Speccy related bits. a 16k RAM pack for a ZX81 and a DK'Tronics Lightpen for a 48k Speccy Both …
... related bits.
a 16k RAM pack for a ZX81 and ... -
ZX-2-PC Interface : Is it dead ???Certainly not, but I had some problems getting the EPROM-reader constant. In my former threat I stated that it worked, well, it read ROM-values but n…
... interface with RAM instead of ROM can make a 16K ZX81-emulator ... -
Broken 16K/48K spectrums wantedHi, I'm interested in broken 16K & 48K ZX Spectrums, all versions. I'm going to repair them, and add into my collection. If you have several, the b…
... /> I'm interested in broken 16K & 48K ZX Spectrums, all ...
