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<1…17181920212223…34>
  • Spectrum +2 grey ear mod?Is it possible to turn the sound port on the back of a grey Spectrum +2 into an ear input? I know it's possible for the black +2 but I can't find muc…

    ... the internal RAM as a 16k byte area. But because ... only providing 1k bytes, the memory provided by this chip is ... of upper RAM in the memory map must not respond ... the display data (which is lower in the RAM) must ... so it will only see 16k of RAM at first. There ...
    1024MAK 1024MAK November 2017 Hardware
  • problem loading/playing gameshello to all! i was last active at this forum 11 years ago, and here goes the same thing :) found my old speccy, did the composite mod, managed to …

    [quote="Ast_A_Moore;927726"]No, the lower RAM is there. It’s ... the eight ICs in the lower left corner. The upper RAM ... issue 3b boards with only 16k of memory... thought that all were ...
    xtr3m3 xtr3m3 November 2017 Hardware
  • 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…

    ... full already.

    Remapping memory, be it RAM or ROM ... ULA controls the ROM and lower RAM area, but 74 series ... can easily override the ULA memory control logic. So either the ... multiple banks. Say the top 16k of memory.

    Indeed, there ...
    1024MAK 1024MAK February 2019 Hardware
  • Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…

    ... to replace its legacy regulator, or whether to use something lower- ... .[/quote]

    All 16K / 48K / plus boards were fitted ... signals...).

    For the 16K / 48K / plus boards, the ... recommend you replace like with like. So replace with the ...
    1024MAK 1024MAK May 2019 Hardware
  • 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…

    ... you have the option to replace it with another compressed screen ...
    TomD TomD May 2019 Development
  • 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…

    ... run code to anywhere in lower memory, the ability to name ... the small run code memory location. Default is 23734 ... snapshot size for a 16k game is very large ...
    (A)Often 16k games where captured on a ... using an Emulator with 16k machine selected you should ...
    TomD TomD May 2019 Development
  • Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…

    ... />
    The ZX Spectrum 16K, 48K and plus machines all ... capacitors. Neither is critical. Replace on failure. Most machines are ... The remaining electrolytic capacitors - replace on failure or when symptoms ... , or the even older lower capacity DRAM chips, I ...
    1024MAK 1024MAK September 2019 Hardware
  • 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…

    Thinking about this again, despite memory costs, how about for the ... another 16K bank that can be paged in to replace the ROM ... space perhaps.

    Said memory should retain its contents from ... to do this on the 16K.

    Possibility for ...
    spider spider July 2020 Hardware
  • If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…

    ... changes, continue with the 48k memory system (but no benefits),
    memory than a C64...).[/list]
    memory bandwidth so that there is ... the upper RAM, you get: 16k (lower RAM) + 64k (upper RAM, some ...
    1024MAK 1024MAK August 2020 Hardware
  • edge connector... breadboard / external romso i purchased a breadboard on a edge connector.. to experiment with .. my first task to make a external rom boot (32k eeprom) so i think i got every…

    ... /E pin tells the memory chip to come out of ... Z80 is attempting to access memory, I/O devices or has ... so has 64k bytes of memory. JA14 and JA15 are ... to select which ‘bank’ (16k byte area) in the chip ... br />
    If a smaller/lower capacity chip is used, if ...
    1024MAK 1024MAK November 2020 Hardware
  • How Many Games Exist in Both 16K versions and 48K Versions ? I have found one ( Dallas (CCS) 1982 but there could be some more

    ... it lol) , it has a 16K version one side of the ... levels as needed on the lower memory machine, it seems to have ... but the ROM version is 16K. Having said that I've ... on a 16K machine it may well use upper memory so fall ...
    spider spider November 2020 Games
  • 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…

    ... in the camp of always replace all the electrolytic capacitors in ... on failure.

    For 16k/48k/+ models, the most common ... one or more of the ‘lower’ DRAM chip(s), the 4116 ... issue number of 4a or lower, unless it’s been upgraded ...
    1024MAK 1024MAK February 2021 Hardware
  • CSSCGC 2021: 25th edition extravaganza![img]https://csscgc2021.files.wordpress.com/2020/12/yellow_programmer_960x600.png[/img] [url=https://www.rickdangerous.co.uk/csscgc2021/][b][size=…

    ... 16K ZX81. And also for the same machine and the same memory ... bound to be easy to replace the element, right? Only when ...
    The Mighty Dopethrone The Mighty Dopethrone April 2021 Games
  • Questions about microdrivesHi! Bought an Interface 1 and two microdrives along with around 10 microdrive cartridges. Installed (great but very expensive) vdrive zx into one …

    ... ..?

    [b]The felt. Replace the felt. This stops old ... has RAM from 8k to 16k. It is used to house ... routines to set up the memory from a Multiface Snapshot. It ...
    cj7hawk cj7hawk May 2021 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... did was just get the memory contention circuitry to override the ... the intended refresh of the 16K byte ‘lower’ RAM did not work ...
    1024MAK 1024MAK August 2021 Hardware
  • Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…

    ... the entire screen block ( well, 16K of it... ) since it's ... reading it from the upper memory area above 4000.... That at ... alternative would be to just replace the upper 8K or the ... and all the original Spectrum memory at the same time.
    cj7hawk cj7hawk October 2021 Hardware
  • Are 128K games more likely to crash than 48K ones?Hey, guys. I've been doing some experimenting with various games and even some music demos and apps, and I'm beginning to reach a conclusion that …

    ... banks into/out of the memory map.

    So it ... /> A 48K game or a 16K game will not (normally) try ... bank switching register. But the 16K of ‘lower’ RAM still comes from ...
    1024MAK 1024MAK February 2022 Games
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... 1, carry is set if lower bit was set
    jr ... will hold value we will replace escape code with
    ld ... br /> ; returns pointer to allocated memory in HL
    make_nil_cpair:
    .dontprintlist
    ; free all the memory on the heap
    call ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... 1, carry is set if lower bit was set
    jr ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... 1, carry is set if lower bit was set
    jr ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... 1, carry is set if lower bit was set
    jr ... will hold value we will replace escape code with
    ld ... br /> ; returns pointer to allocated memory in HL
    make_nil_cpair:
    .dontprintlist
    ; free all the memory on the heap
    call ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... 1, carry is set if lower bit was set
    jr ... will hold value we will replace escape code with
    ld ... br /> ; returns pointer to allocated memory in HL
    make_nil_cpair:
    .dontprintlist
    ; free all the memory on the heap
    call ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Sound emulation...I recently souped an 486 I had with some memory, a Soundblaster 16 and CD-ROM drive. It would have been a monster just a few years ago [img]/__forums…

    ... 486 I had with some memory, a Soundblaster 16 and CD ... , fast sound emulation for this lower spec machine? ZX32 sounds good ...
    Fuzzbucket Fuzzbucket September 2001 Emulators
  • Thanks for the memories... is it 16k or 48k? Hi. At three different flea markets in Gothenburg, Sweden I found just as many Spectrums... (and a ZX81! [img]/__forums/images/smiles/icon_smile.gif…

    ... the size of their RAM-memory?

    Most basic-dialects ...
    Lars Lindblad Lars Lindblad January 2002 Sinclair Miscellaneous
  • AY musicThis is a format I'm proposing for an AY music player. If anyone can see any problems or anywhere it can be improved please say so. An AY music form…

    ... 2byte values containing the instrument memory loaction offsets plus a final ... at the bottom of the memory 16k in the top page) to ... can be used at any memory location. Thus all the information ...
    cyborg cyborg October 2001 Sinclair Miscellaneous
  • ? M3732-20RS ?I have eight chips of memory from my old zx spectrum 16k. I?d need to know the pins description of them to use it. The text on the chip is: …

    ... eight chips of memory from my old zx spectrum 16k. I?d ...
    Gento Gento June 2001 Sinclair Miscellaneous
  • 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.
    Andrew Andrew January 2001 Sales
  • 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?
    Spector Spector May 2002 Games
  • 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 ...
    Spector Spector May 2002 Sinclair Miscellaneous
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
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HitBox

Word Docs Hits
replace 5.4K 6.2K
lower 6.4K 7.8K
16k 5.5K 7.7K
memory 21.8K 32.5K

Related Threads

  • Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
  • New memory model: 16K/48KAs earlier suggested in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=32096"]this thread[/URL], there was also Spectrum software that …
  • Upgrading 16k MemoryHi All<br /> <br /> I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flas…
  • 32k memory Italian memory expansionNot mine but its an [URL="http://www.ebay.co.uk/itm/TENKOLEK-32K-RAM-Expansion-Sinclair-ZX-Spectrum-/320861810075?pt=UK_VintageComputing_RL&amp;hash=…
  • Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic.<br /> …
  • 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…
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ?<br /> <br /> Speccy with a 16K sticker on the base.<br /> <br /> Doing a peek 23733 returns…
  • Another hardware question - lower 16k bad?Like in my last question, I am referring to this video from JoulesperCoulomb (https://www.youtube.com/watch?v=IzgCmldm2H4), this time, it is with the…
  • 16k and PEEK 40000 (on a real 16k Spectrum)?Imagine a real 16k Spectrum (without any RAM expansion or circuits fitted). What would I get if I do a PEEK or try to access memory over 32767?<br />…

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