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Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…
... and A14=1 and fast memory page is set, ports is ... and A14=1 and slow memory page is set, ports is ... -
Halloween Special!Like all the best zombies, the ZXSpin project rises again on the last day of October. Here's release 0.666 for your enjoyment - get it at [url]http…
... - allows you to view a memory bank relative to
a ... -
SPIN's breakpoints - an overviewAs quite a few people have been asking how to set breakpoints on memory write etc. in SPIN, here's a description of the way the breakpoints work. Get…
... how to set breakpoints on memory write etc. in SPIN ... matter where PC is in memory:
[code]
... a condition that reads memory, this can be done ... specify a read from memory. The address needn't ... on its own without checking memory / IO status but the ... -
ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... reads from random places in memory so it doesn't guarantee ... Zx Spectrum 48k the uncontended memory is refreshed using this scheme ... />
But how is contended memory refreshed? By constantly reading from ... -
One Liner - Machine CodeHi Dr. BEEP, Digital Prawn, et. al., I think that what you guys have achieved with the one liner contest is absolutely amazing. It brought about wh…
... "runner" which loads bytes into memory and then runs a resultant ... code program at a given memory address
2) Run the ... -
Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? I'm doing a lot of research into the ULA and also the reasoning …
... high impedance - this is a memory refresh issue.
Tracking ... -
Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…
... to load new code into memory.
So I hooked ... -
Another odd Spectrum 48k... or is it?Amongst some goodies I acquired at the weekend, [URL="http://www.drumfu.com/OddIssue2SpectrumFull.jpg"]this Issue 2[/URL] is unusual. I have a bit of…
... how to page the additional memory in!
Apologies for ... -
Dell Dimesion 8300 - Blue Screen of DeathOver the last couple of weeks I have been attempting to fix a Pentium 4 Dell Dimension 8300 belonging to a blind frienrd of mine. I kept getting the…
... Write/Read error at **SOME MEMORY ADRESS**
Decreasing system ... shot, So i removed the memory (4 * 512Mb chip sets). And ... . I therefore concluded that the memory was not to fault.
memory and CPU. I am still ... -
Multi-tasking OS on the Spectrum?Do you think it is possible to build a multi-tasking operating system on the Spectrum? That is, most important the ability to have several task run…
... and above? We can leave memory protection between different tasks for ... -
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... won't need to be memory mapped. This will reduce the ... 16K of the Speccy's memory, and it also means hardware ... is much slower than one memory access. However, copying data will ... -
How could you hear if loading BASIC or MC?When loading a Spectrum program from tape you could usually hear from the sound if it is a BASIC or is some machine code program *. My question is, w…
... .g. PRINT) was represented in memory by some kind of ascii ... not a Basic program in memory (and to tape) look about ... -
+2 gray external sound source socketHello I'm repairing an old +2 grey that was given to me, it was in a terrible state (damaged and in pieces). I've managed to repair the board using …
... repair the board using some memory chips i bought from sintech ... -
Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... fetches the bytes without any memory contention would be nice, too ... -
So who needs a 3.5 GHz dual core Core 2 Duo......when a 6MHz Z80 will do for a multi-user server? After hacking about more with the socket library - I had 4 simultaneous users on ALIAC-2 via eth…
... in indirect mode rather than memory mapped mode. I've also ... been looking at what flash memory/static RAM I'd like ... -
Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... /> I thought it was a memory problem, since i tried known ... .
So i removed all memory chips and installed chip beses ... afraid it could be a memory controller chip so there is ... -
How does the Z80 work internaly?How does the Z80 work internaly, i.e. how does it actually execute a machine code instruction? When it fetches a byte from the memory and finds, for…
... fetches a byte from the memory and finds, for example, the ... -
New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…
... only game - both due to memory constraints - I was wondering if ... -
Bloke missing for 5 yearsGetting fascinating that story about that bloke who was presumed dead, missing for 5 years just turning up at a police station making out he had memo…
... station making out he had memory loss ?
Turns out ... presumed he totally lost his memory etc but did sound strange ... -
New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…
... shouldn't take any extra memory. Speed is slow, because the ... -
Help with BloodwychHi all, Just started play ZX Spectrum Bloodwych and wow it is so good. I only get confused by Spectrum docs as it looks somewhat incomplete. My ques…
... made more simple maybe cos memory restrictions of 48k machines. Interesting ... -
Adventures in Programmable Logic Part 2So, now armed with an Xilinx Parallel III cable, an XC9536 CPLD, a breakout board with power, a JTAG pin header and a 44-pin PLCC socket, I could try…
... needs to:
- contain the memory page registers for the flash ... -
My PC keeps freezingEvery day it will eventually freeze, ther are 2 occasions when it will freeze 1. After i have been using it it will freeze even the mouse pointer st…
... an extra 1GB of memory but the memory was causing probs and ... -
Where Time Stood Still.....Just rediscovered this Masterpiece.... I need a little help, from memory, plane crash, use rope to stop fatty falling down the hole in the bridge,…
... need a little help, from memory, plane crash, use rope to ... -
Sentinel - missing versionNope not [I]The Sentinel[/I], but this game by Abacus programs: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0004399[/url] There are two v…
... was something to do with memory size due to being a ... -
Does this (Windows) program exist?You know how when you first turn on your PC, and Windows loads up and allows you to start, that everything seems to respond immediately? But the long…
... just that, by optimizing the memory or Windows' internal settings, or ... -
It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…
... of the Spectrum ROM's memory map as a jump table ... can find a location in memory which no one *ever* calls ... -
Mini laptop for Speccy - eee[url]http://reviews.cnet.co.uk/laptops/0,39030092,49293507-1,00.htm[/url] I love gadgets and i must admit i love what i'm hearing about this Asus ee…
... few things on this with memory cards. I've got a ...
