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Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…
... lower 16K RAM is more exposed to failure than the upper 32K ... that some of the lower RAM is defective.
Check if ... any of the RAM-chips are hotter than the ... just have to replace the RAM and see if it helps ... -
ZX Spectrum Woes...In my endeavours to get my second Spectrum (Issue 3) working I have replaced the CPU, memory and lower ram. I have fitted sockets for the CPU and me…
... that can take it, ie RAM turbo or Interface 2 (its ... lower memory, if it was upper memory you would at least ... -
New platform game: Sid SpannersHi all, here is my Christmas present. A new platform game (well, more of a mini-game really). [url=http://java.cms.livjm.ac.uk/homepage/staff/cmspc…
... memory (the first bit of RAM straight after the attribute file ... fast as having them in upper memory, but if memory is ... -
Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... rid of the crappy lower ram chips.[/QUOTE]
I ... agree. Doin' the Sami?s Upper SRAM 32K D43256BCZ-70LL SRAM ... -
Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... :
Of course upper 32K RAM should be an SRAM, Z80 ... -
Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... realized Sami?s 32K RAM SRAM FIX changing and ... , it detected 128K of RAM!! and all the graphics ... * 32K SRAM D43256BCZ-70LL NEC upper ROM placed.
* SRAM ... Removed IC25, IC26 and 8 RAM chips.
If ... I have a BASIC RAM calculating: LET N=PEEK ... -
Upgrading the Humble Spectrum 128 +2 (Grey)Hello there my fellow WoS'ers I am at a subtle in-pass in my wants for one of my +2 motherboards. I received this mobo, DOA in a job lot from fleab…
... an put that in the upper 16K?
would there ... 4k of rom. without extra ram you'd have to use ... one of the speccy's ram pages for buffers etc, like ... -
binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…
... the lower 16K RAM, the screen area, and the upper 32. I ... -
Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... short circuit on low bank RAM. TR5 (ZTX213) rarely becomes damaged ... any chip in the low RAM bank, with a little of ... as normal (although with 16K RAM if upper memory was defective). If ... the contended bank (low 16K RAM) are damaged, and beyond this ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... 16K as ROM and upper 48K as RAM works or not? If ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... 16K as ROM and upper 48K as RAM works or not? If ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... 16K as ROM and upper 48K as RAM works or not? If ... the address is ROM or RAM. This penalizes all the writes ... easy implementation of +3 "all RAM" modes and the emulation of ... ROM by 8k ROM + 8k RAM). -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... with the upper 32K RAM. The 'dead cockroach' fix & upper 32K RAM are ... test program that checks lower RAM, to make sure there isn ... . A machine with lower 16K RAM okay is better than an ... how to locate, and fix upper 32K RAM problems.
[*]Be careful ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... over the display area of RAM and lowering the RAMTOP and ... of the lower 16K of RAM.
It quickly identified ... an area of the upper 32K of RAM for a while too ... /control signal for the lower RAM.
Are any of ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... CPU to refresh the lower RAM when the ULA isn't ... the test over the upper part of lower RAM), so the problem ... -
Interface 2 custom cartridges (fruitcake.plus.com)I guess most of you are familiar with these interesting pages: [url]http://www.fruitcake.plus.com[/url] I have several questions regarding this: 1…
... non-transparent modes use the upper 64 bytes of ROM, so ... that is more than 48k RAM in total?
4. Is ... -
4116 and 4164 chip avaliableHi all, while clearing out lots of old odds and sods I have come across a fair number of old dram memory chips. I have 200+ 4164 from various manufa…
Do you mean the upper 32k RAM (4564's) ?
I still have plenty of 4164's which are a direct replacement.
How many are you after?
Steve. -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... on pins on the lower RAM chips (8x 4116, lower left ... are back in place! These RAM chips are very sensitive to ... ; if not: repeat. If upper 32K RAM is socketed, you can just ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... on pins on the lower RAM chips (8x 4116, lower left ... are back in place! These RAM chips are very sensitive to ... ; if not: repeat. If upper 32K RAM is socketed, you can just ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... [I]suspect[/I] the lower RAM - can you post a screenshot ... patterns / colors [I]which[/I] RAM chips may have gone dud ... for that ;-) ). Btw: voltages OK? Upper 32K removed?
Alternatively ... -
ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
... . The missing heatsink covers the upper portion of the board, from ... been repaired earlier and all RAM chips and some logic chips ... -
Faulty +2 advice please :)Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any b…
... shorted to ground by an upper 32K RAM chip.
You should ... -
3D Deathchase on the Commodore 643D Deathchase has been ported to the C64, at least according to Micro-Mart. According to this week's MM, the port is called Hell Racer, and here's a …
... not using an external colour RAM like the C64 does (saving ... assigned to screen and colour RAM at start up (these can ... to 2MHz mode in the upper and lower borders to get ... -
AY-interface for ZX81 (at last ;) )Hi, it exists finally ;) - compatible with the most standard one - ZonX. [url]http://www.sellmyretro.com/offer/details/Brand_New_Sinclair_ZX81_MrX_A…
... does it only expand the RAM to 32K and not 64K ... like some older ZX81 RAM expansion packs?[/QUOTE]
RAM a zeddy can carry. The upper 16K is ... -
I/O port adress map of Spectrum and interfacesI'm looking for an adress map of all the used and unused I/O ports for the ZX-Spectrum. Many years ago I designed an I/O board for the Spectrum that…
... I would connect the extra RAM directly on the Spectrum bus ... to use for bankswitching the upper 32K.
That would give ... theoretical 256 banks of 32K RAM = 8192K or 8M total.
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... that doesn't fit in ram?[/QUOTE]
esxdos is ... is they are putting an upper bound on how long it ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
[QUOTE=Crisis;634843]this routine is only about 90 bytes instead of 257 !![/QUOTE]
Yes, but take into account that this routine writes to various RAM positions though all the upper 32K RAM space during its execution.Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…
... you can disconnect the upper 32K of RAM in the PCB Harlequin ... some logic to support video RAM in page 7 as well ...128k gone badHi All, Turned my 128k on this morning and... [img]http://www.w.angold.btinternet.co.uk/bad128small.jpg[/img] Can anyone help? whats the most lik…
Almost certainly bad RAM (one or more bad RAM ICs)
If you have a DivIDE or any other piece of hardware that makes a 128K come up in USR 0 mode, if the failure is in upper memory it's very easy to find using BASIC POKE and PEEK.
