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Loads of Microdrive cartridges on Ebay plus Vortex RAMI?ll be selling three bundles of eight Microdrive cases with four, used cartridges each, means 32 cartridges per bundle, here?s one of them [img]http…
... SP 512 RAM expansion with CPU and ULA for the Amstrad ... -
HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
... halt is already read by cpu, why it tries to read ... ?
I mean if cpu executed HALT at cycle 5 ... interrupt triggered at cycle 6, cpu will not jump to interrupt ... -
Acorn A7000+ on EbayNot so much Spectrum related, but it clearly shows that I will/have to focus my hobby more on Sinclair and MGT. An auction will start on Ebay tonig…
... /> Acorn A7000+, 48 MHz 7500FE CPU, HDD, RISC-OS 3.7 ... -
New version emulator ZEsarUX-2.1Hi I have uploaded a new version of my ZX80/81/Spectrum/Z88 emulator on http://sourceforge.net/projects/zesarux/ Changes are: Added Cocoa…
... -to-speech program
Added CPU Speed option
Added Z88 ... -
Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
... access is requested by the CPU, and the I/O address ... -
What would have been the hardest game to write?<div>I was recently think about Code Masters' Fruit Machine Simulator and what a piece of **** that would have been to code. I bet it brought in some…
... of memory and 3.5MHz CPU could spring up. Games such ... -
Spectrum+2 Tape Deck Buzz<p>I've been messing with a Iss3 0500 Spectrum +2. So far I've replaced the electrolytic capacitors, flipped the transistors, add…
... 'm thinking that the noise/interference/buzz is being caused by ... way to filter this noise/interference out? If not and I ... -
Could ELITE's wireframe graphics be improvedWas watching this video last night comparing the BBC and Spectrum version of Elite: https://www.youtube.com/watch?v=Ov4OAteeGWs It seems that the…
... the fault of the Z80 CPU that the Speccy couldn't ... -
I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…
... />
So either the CPU and the ULA have to ... provide some interface between the CPU and the memory, so ... ULA sits between. From the CPU's perspective, the ULA ... only" memory chip. The CPU can now run as quickly ... needed to slow the CPU down is no longer ... -
My experience with a ZX Spectrum clone called Elwro 800 JuniorAfter a long break in using this forum (modellrailroading is my main hobby) I'm back and want to tell something about an interesting ZX Spectrum clon…
... /> - Z80A unofficial copy (MME 80A-CPU)
- several EPROMS
- 1 ... there is a MME 80A-CPU processor which seems to be ... an unlicensed copy of Z80A CPU made by VEB Mikroelektronik „Karl ... -
Full-screen 32 columns bicolor engine NIRVANA+I'm glad to announce the release of [b]NIRVANA+ ENGINE[/b], providing support for bicolor graphics (multicolor 8x2) in 32 columns for all standard Sp…
... /> [i][b]How much more CPU does it use?[/b][/i ... exactly the same amount of CPU.
[i][b]Hold ... -
1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…
... machine and to allow the cpu to run while playing music ... -
48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... get warm, although ULA and CPU do... Is this normal? Unfortunately ... -
System Shock's ownership has been sorted out, and you can now buy a copy!Finally, System Shock is available again to purchase! If you go to: https://www.gog.com/game/system_shock_enhanced_edition then you can buy one…
... is all done by the CPU), and it has 2D sprites ... -
Question about Z80 and RD/WRI know almost nothing about the Z80 CPU but I am learning. I know this is WoS so I hope asking generic Z80 related questions are OK. Anyway, I wa…
... almost nothing about the Z80 CPU but I am learning. I ... can't imagine that the CPU would incorrectly try to read ... -
PUSH scrollers 3[url=https://drive.google.com/file/d/0B-KEeni1WXmoYk9Dek1zVnd6Rk0/view?usp=sharing]CATS - Faith edition (example)[/url] Hello and welcome to the w…
... that do not take much cpu time.
This version ... -
Recreated ZX Spectrum thoughtsI have a recreated ZX Spectrum (and a Vega and a 48K with SMART) and while I know it is not well regarded I actually quite like it. The app is "ok" a…
... a very neat platform - fast CPU, decent storage and memory, wifi ... -
The Great Escape. I found an alternative escape route.I managed to figure out a way to escape without ever using the wirecutters. So if you've beaten the game a lot of times and would like to try somethi…
... yard gate and let the CPU take control of your character ... -
No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…
... the same time, allow the CPU to continue, would this be ... -
Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…
... persists when swapping ULA & CPU.
Any ideas ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... the 7805 seems fine. Possibly CPU or ROM? Not sure how ... -
MiST fpga and ZX Spectrum coreI don't see any MiST related thread here. You've probably already heard of it, it's a device which recreate some computers (atari st, amiga, amst…
... more accurate (for the z80 cpu, and maybe other parts as ... -
Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…
... T on average. Whereas the CPU takes 3 T for a ... access memory faster than the CPU?
And then there ... -
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 …
... the Spectranet, I changed the CPU for an old NMOS one ... -
spectrum 48k issue 3b coloured blocksI have pucked up a nice looking plus but when powered on get black or yellow border and random coloured blocks on screen, I have taken keyboard off a…
... look, I am getting the cpu taken out and. socket fitted ... and a replacement cpu fitted if it's the ... -
Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…
... 've already tried different ULA, CPU, ROM and low RAM (replacement ... -
Multi-platform hits that lack a Speccy port?Title says it all, really: Do you know any games that were a great hit, ported to several (or even many) platforms, but -for whatever reason- didn…
... [/i] later. As far as CPU & graphics capabilities allowed, of ... -
Harlequin turbo mode ( 7 MHz )Hi, All. Sorry for my bad english. I make Harlequin mod - turbo mode ( CPU clock 7MHz ) for Harlequin. Could you be so kind to write your opin…
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…
... , TR5 as well as its CPU. It originally had quite high ... 't have been doing the CPU much good and after changing ... /> I've tried swapping the CPU and ULA with a known ...