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128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…
... /> I put in the 8 RAM banks, 2 ROM banks, and ... fake/emulate for a sucessful 128K startup?
-- Richard -
RAM paging and port usageDear users and developers, I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especially those a…
... found:
Spectrum 128k and +2:
port ... is reset, same as Spectrum 128k and +2.
... of the second 8 RAM pages (RAM 8..RAM 15) is paged ... />
Pentagon 128k:
same as Spectrum 128k and +2
128k, bits 6 and 7 ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... /> I had two ZX Spectrum 128k with a similar behaviour. One ... and then there were increasing RAM cell failures. Especially if external ... it to pin 4 of RAM IC4) to ground.
After ... I know that especially some 128k Speccies have some problems with ... -
Very simple 128k memory test?Just an idle thought, but... If on a 48K machine: [INDENT][B]PRINT PEEK 23732 + PEEK 23733*256[/B] [/INDENT]yields the last reliable RAM address, …
... /> [/INDENT]yields the last reliable RAM address, then what would be ... command to execute on a 128K/+2/+3 machine? -
Lancelot 128kHi, everybody! I was interested about Lancelot for the 128k Spectrum, however was unable to get a working copy of the second part. No matter you us…
... interested about Lancelot for the 128k Spectrum, however was unable to ... you want to undo, restore, ram restore?
Indeed, the ... steps:
a) Type "RAM" then "RESTORE", then press ENTER ... -
zx spectrum 128K+2(gray)-vanishing colorsHi, I just got "new" zx spectrum 128k+2(gray) made in uk version. Beside tape dead and memory issue - only first 16k RAM works in 48k mode, it has s…
... just got "new" zx spectrum 128k+2(gray) made in uk ... memory issue - only first 16k RAM works in 48k mode, it ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... the detailed timings of contended RAM. It gives timings for Z80 ... in, or reading/writing, contended RAM.
I can decipher ... double buffered -- paging RAM bank 7 into a 128K machine) involves blitting ... -
48k games developed on the 128kSeeing as I don't know enough about this subject(or the history of assemblers/C/C++/BASIC/FORTH/COBOL/whatever programming kits), I thought I'd ask h…
... of the 128k, all I think of is the extra RAM usable ... use of all that extra RAM.
So I thought ... 48k games developed on the 128k? I mean, I would think ... were developed strictly on the 128k (and then why/how/what ... -
50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... -pixel horizontal scrolling on a 128K Speccy.
Graphics are an ... they can stay in uncontended RAM.
Admittedly there isn ... -
changing extended RAM pages in SpinIs it possible to edit the data in 128k extended RAM pages in Spin? I've tried both the debugger tool and the pokes tool and, although they let me ma…
... to edit the data in 128k extended RAM pages in Spin? I ... -
Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…
... .. it was not a ram chip: the 'shortcircuit' ... course I already removed a ram chip :( stupid...
... screen there was some ram checking done when booting, ... and stopped working after the '128K boot'.
I then ... with A0 on the ram chips from the documentation ... -
Ram Turbo compatibilityThe Ram Turbo interface, couple of joystick ports (iirc they can be Kempston too) and a IF2 style cartridge slot. This one > [url]http://www.worldofs…
The Ram Turbo interface, couple of joystick ... / 48K / + , obviously yes.
128K ToastRack = yes, I think. The ... -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
Does anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ?
Looking at schematics it has to be simple solution, probably king of interleaving, but I could not find any details. -
Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…
... a repair of a standard 128K a friend of mine handed ... , this is my first 128K and it really seems I ... usually translate into a bad RAM chip. I've already changed ... the whole contended RAM bank, the Z80, ROM ... also the whole uncontended RAM bank? -
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…
... routines to:
* catalogue the 128k RAMdisk in BASIC;
* move ... from BASIC.
CAT!RAM and PUTRAM are updated versions ... threshold.
CAT!RAM prints file name & type ... listings follow. CAT!RAM will work on any 128k Spectrum; PUTRAM will ... -
Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…
... ]
Prices:
- Ram chips: 4164, 4532, 4116, etc ... ]
- Modulator
- 48K / 128K / ZX81 ROM
[B]2 ... each[/B]
- 48K / 128K ULA
- Zilog Z80 3 ... -
Ram test / diagnostic software for 128k?I need a ram test program urgently (as I have to bring this machine into the party place tomorrow) yet I couldn't find any in infoseek by typing "ram…
I need a ram test program urgently (as I ... any in infoseek by typing "ram test" :) And most of the ... .
Are there any ram test suite which runs from ... -
maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …
What is the maximum addressable RAM for a Z80 using bank ... kB) are used as video RAM, but can be used for ... . On the 128k model, the additional 64 kB of ram is mapped ... -
Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …
... repair my spectrum 128k +2 grey, i remove all ram chips and ... , now i have remove all ram chips, i want to check ... to install it to the 128k +2?
the z80 ... -
Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…
... />
the manual say that ram ic's should be KM4164B ... (not repaired by anyone) the ram chips was KM4164B-12
ram?
something else, ... 48k issue 2 zx with RAM chips IC 6-13< ... to remove all the 48k ram chips? it will not ... -
Anyone got any 4146 RAM chips?Hi I'm looking for some 4164 RAM chips, as would be fitted to a 128k Spectrum (+, +2, +3 I think they all use the same memory). Not out of a 48k mac…
... some 4164 RAM chips, as would be fitted to a 128k Spectrum ... -
128k programmingOk, I have had the normal man look (ie. not really), I want a good resource for 128k asm programming. Mostly just to find out how the RAM bank switc…
... want a good resource for 128k asm programming.
Mostly ... to find out how the RAM bank switching works and the ... -
128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…
... parallel here with the Spectrum 128k, in that you had ... of the Spectrum, the 128k model was supported by software ... you expect from a 128k game that you wouldn ... RAM? Any specific examples or comparisons between 48k and 128k ... them (both 48k and 128k so that I can ... -
128K Spectrum - can't figure out what's wrongLong time no post :) So I have this 128K Spectrum (+2 ROMs) that I cannot for the life of me figure out where the problem lies. Let's take a look a…
... />
So I have this 128K Spectrum (+2 ROMs) that I ... ://www.starfleet-net.co.uk/128k.jpg[/IMG]
As ... out of whack.
RAM you say? Tried several different ... RAM chips. Same effect.
... -
Ram Turbo Interface with Kempston and Sinclair/Amstrad joysticksHi! Do you know how to plug and use two different joysticks with the Ram Turbo interface? [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000…
... two different joysticks with the Ram Turbo interface?
[url ... two player games For 48K /128K ?
Thank you all ... -
Redesigning the ZX Spectrum 128k - A lifelong dreamHello, I am myPinballs (Jim) and i run a small business here in the uk making replacement 8-bit hardware pcbs for arcade pinball games as well as…
... board for the zx spectrum 128k for the last 18 ... br /> • 8 pages of 16k ram 128k total
• High quality picture ... connection
• Uses the 128k ULA IC - Ferranti 7K010E/Amstrad ... /> Finally some videos with classic 128k music (similar to the wonderful ... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... version of Balford's ram test diagnostics said the ... whole of upper RAM was faulty (check all ... removed all the upper RAM ICs, replaced with sockets ... />
Given the lower RAM used to be okay, and ... one of the Harlequin 128k revision 2D boards, with ...
