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CAT!RAM and PUTRAMLast year sometime I posted a couple of routines to: * catalogue the 128k RAMdisk in BASIC; * move RAMTOP and the stacks from BASIC. CAT!RAM and PUTR…
... stacks from BASIC.
CAT!RAM and PUTRAM are updated versions of ... /> As CAT!RAM is in BASIC and is swapping around RAM pages to ... get at the RAMdisk catalogue and ... the m/c stack and GOSUB stack and BASIC variables; it also ... -
R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... Russian FAQ covering the Pentagon and Scorpion somewhere...).
and at several points later ... the effect of contended RAM on the R-register? ... any code in contended RAM, but I do make ... then without the contended RAM the HALT would take ... -
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…
... measuring, reading of datasheets and experimenting, I have ... column address to the RAM and so there isn't ... the voltage levels that appear on the lower RAM ... This happens when the voltage is pulled down by ... in component testing/experimentation and so the soldering ... -
Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... have loaded programs and even run a RAM diagnostic. Basically, tells ... out all the associated logic, and RAM chips, with no effect. ... connections between the upper RAM and associated logic, and I seem to ... both the ULA and CPU), however, the voltage is way too ... -
Well I've gone and done it - a PS2 it is!Yep, another successful ebay item in my kitty - a new PS2 with 2 controllers, 8 MB RAM, and 5 free games of my choice(modded PS2 - need I say more?).…
... with 2 controllers, 8 MB RAM, and 5 free games of my ... (Have played pro evo 5 and wanted to see how this ... -
Any interest in new low-cost mass-storage interface with 512K RAM?I've recently added support to ResiDOS and the +3e ROMs for SD/MMC card interfaces; in particular, ZXMMC (which has no onboard RAM and so is only sup…
... ZXMMC (which has no onboard RAM and so is only supported by ... be the 512K battery-backed RAM and a snapshot button. A very ... retained in the built-in RAM and are instantly available when you ... from the built-in RAM, including ZX80 and ZX81 emulators available from ... -
Memory paging in 128 KB - 64KB RAM possible?I have found a quote in Spectrum 3 manual (available at WOS) -------------------- In the +3, we have crammed in more than twice the amount of memory…
... 131072 bytes of
RAM and 65536 bytes of ROM making ... called
paging - BASIC (and the processor) always 'sees' the ... of
ROM and 48K of RAM ([B]or 64K of ... RAM with no ROM - though ... " the ROM memory completely and to write to the lowest ... -
MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
...
Some ideas and rules about further software development ... devices at MB02+ and Spectrum and data exchange between all ... snapshot into free MB02+ RAM and to switch between these ... have enough RAM installed and that is cheap and could easily ... -
Copy interface ROM content to RamHi all, I have a very rare logitec centronics and disc interface. To save its ROM content I would like to copy it Ram and store it somewhere. How ca…
... a very rare logitec centronics and disc interface. To save its ... would like to copy it Ram and store it somewhere. How can ... routine to copy from Ram area to Ram area could be sure ... -
Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …
... thought into channels and streams, and read the dead (and presumably rotting ... : The goal, handle channels and streams without needing to trap ... somewhere in RAM to cause a ROM page-in and the appropriate ... wrapper at the top of RAM and doing what the ZX CLEAR ... -
err, I like wrote this years ago, and just found it archived.[b]read it, and say it's crap if you want, but do not go on about the technical side, cos it was bullshit, we all know it, and the end makes no sense…
... action shotgun, again, and again, and again and again, until the ... finally stopped pontificating and clicked into luminescence, and Tex 'ollied ... advanced far beyond 48k RAM and bulletin boards that one ... it could be quickly and effortlessly restored. Shutting the ... -
Making BASIC occupy less RAM?I risk being told to search the forums and the entire archive of type-ins, but here it goes... Is there any known utility to do all the hard work of…
... all the VALs, NOT PIs and similar tricks?
RAM, and then a routine in ... listing.
And finally, is there any utility ... a long BASIC listing and the programmer decided to ... " listing would fit the RAM just fine. How would ... -
Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…
... . I did that and ran the command and got 32767 which is ... says that machine has broken ram. And if i remove upper memory ... -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... or larger areas of upper RAM and no problem was ever ... the section RAM-READ begins examining and modifying each possible RAM location, from ... byte of lower RAM (32767) being (successfully) tested and on the ... of all upper RAM is provided by IC20 and this was ... -
Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
... binary compatible with older Z80s and could it be used as ... MHz
? 64 KB RAM
? Single voltage
? 256 I/O ... -
Grey +2 and black +2A keyboards, funny !!!Hi all, Yesterday I was working on a destroyed +2A (case and motherboard)... I changed the ram, and the MB returned to life. But the keyboard is dead…
... 2A (case and motherboard)...
I changed the ram, and the MB returned ... of my other +2A, and it worked. I dismantled the ... has a 11-line and a 13 line connector.< ... membrane has a 5 line and a 8 line connector, ... very late at night, and a strange idea emerged in ... -
Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…
... component part, changed 78s05 and ztx651 and ztx213, voltages seamed good ... paper screen. Desoldered all ram and mounted turntip sockets, changed ... spectrums) and found comparing with my working one that voltage on ... pin 9 (a7) of the 25 to 32 ram ... -
Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
... new upper ram replacement module from Zorn yesterday and seem ... i get black border and paper with vertical white ... the upper ram module be so kind and give his ... ups (powering on and off and not just reseting it ... DMA to the upper RAM and uses unusual timings that ... -
Power issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…
... the bottom 16K ram and replaced TR4 and TR5 to no ... hand leg of the voltage regulator gives a reading ... says 125 @ 400K and anything under 100 is probably ... br />
[b]RAM test:[/b]
previously I ... /> This looks okay, and had previously replaced it:
Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …
... of lower RAM. A few errant pixels and attribute squares ... and C64 and tested for leakage and capacitance: no faults apparent and upper RAM ... SRAM module for the lower RAM and a different ROM (Hitachi ... the fault occurs, the voltage at this point does not ...Harlequin 48k and 128ki am redoing my harlequin 48 parts onto a new harlequin 128k bored only parts i can't swap are the rom, ram and will need an ay chip but seeing as th…
... 't swap are the rom, ram and will need an ay chip ... with smd parts already fitted and ordering a second kit to ... will have 2 harlequins up and runningLower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…
... have 1 spare lower ram, and 1 spare upper ram IC's you ... has highlighted that both IC6, and IC17 have failed so looking ... , happy to pay going rate and postage, have Paypal. Cheers.Is it safe to use TSTACK and OLDSP from a USR nnnnn environment?Hi guys, I've recently revived an old project of mine which gives the Spectrum +3 a new set of customised menus (see this thread [url="https://www.wo…
... +3[/url]) and during initialisation it does some RAM and ROM switching. In ... my own store for SP, and a small area for the ... i could just use OLDSP and TSTACK instead.
Any information ...Character wobbleHello, I have an Issue 2 board which shows vertical character wobble. This happens for a few minutes followed by a few minutes of character sta…
... fail (taking out the lower RAM) and also causing the 12V
All electrolytics have been replaced and the LM7805 replaced with a ... a possibility that the excess voltage may have
damaged ... but they're pretty robust and the voltage
wasn't that ...sam coupe with external 1mb ramvelesofts site has snaper disks: https://velesoft.speccy.cz/sam_zx128.htm when you use masterdos to detect the external 1mb of ram interface th…
... lets you select the fast ram and the zx spectrum game uses ... this ram above 32768 this gives you ... compatible than the +2a/b and +3!
https://www ...Original rubber key 48k'sThis question is to some point academic; But i seem to remeber the original 48k Rubber Keys Speccy came in versions 1,2 & 3! (way back when, occasi…
... voltage fluctuations. This results in the loss of the -5 volt and ... +12 volt supplies to the RAM and the appearance of ... Research in the manual. Games and other software which check the ... is nearer the expansion port and appears as a visible metal ...WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…
... 2 V and Iss 3 V are voltage levels on pin ... voltage on pin 28 is over 0.70 V, and ... of the ULA and the EAR and MIC connectors, but ... of RAM, and the processor with the upper 32K RAM and 16K ... ROM are working independently of each other. The data and ...My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …
... shadowed. As RAM 2 would normally shadow the RAM, and this would just ... lower 48k will hence contain RAM 5, and RAM 4,6 or 7 ... various parts of the RAM, in 32k and 16k combinations in the ... have information on low voltage and small scale chips and could help you ...is my ZX Spectrum + finished :(When i turn it on the screen i get the usual gray border all around but in the screen area i get yellow and some orange lines with a black background…
Yup, one of your RAM chips is shot. Not literally, ... ... otherwise send it this way and I'll sort it for ... like your CPU, ULA, coil and voltage regulators transistors for the -5V ... and +12V are all fine, so ...
