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Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…
... load a SCREEN$ in to memory and save it out to ... worried about over writing BASIC memory so would the following work ... -
ZX Spectrum 48K,issue two - can't get it repairedI have an issue 2, which has some weird very small PCB hanging over the Z80. Some wire go to various places on the big PCB, two go to connections 36 …
... that some of the lower memory chips are gone. I still ... dead.
Test 1 = ok
Test 2 = ok
Test 3: LEDS ... 4 times)
Test 4 = ok
Test 5: LED's 3 ... />
I removed all lower memory chips, inserted sockets, and pushed ... -
ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
... the diag board claims low memory problems and the ZX ... right voltages on the lower memory chips (+5V, +12V, - ... be the culprit? The lower memory is 100% ok, works ... it for other working lower memory, I get the same ... to replace? Any specific test I could perform? -
DIVIDE with 512kB memory upgrade for saleI sell DIVIDE (original version 57c) with my memory upgrade to 512kB ram. [img]http://velesoft.speccy.cz/other/divide512-smallpic.jpg[/img] More in…
... (original version 57c) with my memory upgrade to 512kB ram.
I sell only divide with memory upgrade and plastic case. Not ... -
zx spectrum 48k loading issue (memory problem i think)Hi I have a 48k spectrum that until yesterday was working flawlessly. The spectrum seems to work fine but the problem is with loading games.All the …
... codes like 4 - Out of Memory ; B - Integer out of range ... told that could be a memory problem.
Is there a ... -
What memory pages are being used in a +3DOS disk operation?To make a long story short: what pages are in use by +3DOS while doing read operations from the disk drive? Now, for the details, for those interest…
... block is loaded into main memory, and then, the program starts ... to be loaded in "extended" memory. To avoid side effects, I ... to the end of main memory. A CLEAR 25000 is made ... use nearly all the available memory in all pages) succesfully? Do ... -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
This is external memory upgrade for ZX Spectrum ... upgrade:
+ connect external memory to adress space 32768-65535 ... your ZX Spectrum
+ memory upgrade to 48kB,128kB,512kB ... /> + switch for enable/disable extra memory (128kB / 1MB)
+ possibility ... -
Memory card questionI recently decided to get a new phone (a Vodafone VF543) and i want to upgrade the memory so i can put all my music in it (the internal memory is onl…
... i want to upgrade the memory so i can put all ... music in it (the internal memory is only 50meg) but i ... no idea which type of memory card it will take. I ... -
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…
... about emulation of Z80 microprocessor/memory, they give full list ... )? Which asm instructions and memory regions are responsible for it ... ready and I want to test it with some simple ... for checking correctness of microprocessor/memory emulation. They perform a ... -
Calculating free memory...Hi Folks, I am using the following method to calculate the amount of free memory available to BASIC: [CODE]PRINT 65536-USR 7962[/CODE] Is this the…
Hi Folks,
I am using the following method to calculate the amount of free memory available to BASIC:
[CODE]PRINT 65536-USR 7962[/CODE]
Is this the recommended approach?
Many thanks
Paddy -
Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…
... of the first 16K of memory, where the shadow ROM resides ... bytes. I did the same test using Spectaculator and it behaved ... microdrive cartridge to do this test using the same commands I ... -
128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... and 128/+2 have different memory bank models, does not help ... B0 implies odd pages are contended, however banks 5-7 should ... be contended on a 128.... or is ... -
ZX Spectrum 48K clone and test resultsHi! This is my first post, so, first of all, I'd like to say hello to the whole community! I am Alessandro Dorigatti from Italy and I'm developing …
... .
The first failing test is IRContention; I will try ... the text shown by the test and they are in the ... -
128K+2A/+3 RAM layoutDoes anybody know how physical RAM is mapped to ZX 128k+2a/+3 address space ? There are four 64Kx4 chips IC4-IC7. IC4-IC5 seems to be contended (vide…
... . IC4-IC5 seems to be contended (video RAM). It would mean ... am also looking for RAM test program, can be on ROM ... -
Problems Flashing DivIDE with FatWare.Hi. I've recently purchased a DivIDE and it appears to be working fine, however the firmware on it is 0.12a and I am having trouble flashing it to a…
... , but it is only in memory and vanished when I power ... not have any others to test with.
Could it ... -
48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…
... what I did wrong or test memory using some program and without ... to get this 128k upgrade test and working?
Thanks ... -
Justin Beeper - new demo for the unexpanded 16K Speccy[img]http://pouet.net/screenshots/57726.png[/img] This was my entry for this weekend's [url=http://www.sunrisedemoparty.co.uk/]Sunrise[/url] demo pa…
... , and the lack of fast memory on the 16K means that ... ROM. And doing everything in contended RAM means you're quite ... only having 9K of usable memory to play with, of course ... -
Paging memoryI've been thinking about a possibility of paging blocks of memory to and from disk. Imagine dividing usable 32KB of Speccys RAM (why do they call it …
... possibility of paging blocks of memory to and from disk. Imagine ... it 48K, btw?) into 1KB memory blocks.
Each ... OS would attach bitmask of memory blocks that this process uses ... OS would compare process memory bitmask to the memory track from OS ... -
SP1 and memoryWhile developing my program, I've run into memory related issues and haven't (yet) run into any advice over how SP1 uses memory. The examples all sb…
... advice over how SP1 uses memory.
The examples ... some statically defined stuff in memory at some point above ... 50000.
What memory addresses should I avoid when ... br />
Generally, how much memory should I allocate with sbrk ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... bit in the ULA+ for test if supported. And the future ... . We need to store in memory 4 rotated versions on tiles ... -
Spectrum real speed testI don't have a real Spectrum, but I have a Romanian clone (HC-91). I always believed it was a perfect clone of Spectrum, but it turned out not to be…
... />
I made a speed test that can be downloaded here ... another Spectrum clone) run the test and post the values here ... you are interested in the test idea.
Thank you ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... odd numbered pages are contended (quoting from memory, haven't checked the ... 0-3 to be non-contended, and 4-7 to be ... contended. So, regarding this difference, what ... -
What memory address?If you poke 96 and 236 what would the memory address be? I've forgot how to work it out!!! :-?
If you poke 96 and 236 what would the memory address be?
I've forgot how to work it out!!! :-? -
Why are the same size memory cards different sizes?I've heard before that two memory cards or USB sticks can have the same official capacity, but be different capacities in reality, and I'm not talkin…
... 've heard before that two memory cards or USB sticks can ... the case here) that different memory cards (and USB sticks, though ... , GB, etc) is lower than memory of the supposedly equivalent size ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... require I have as much memory available as possible. I'm ... -
Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…
... 's worth) with data from memory location 53000, I've written ... -
Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…
... and utilities confirming that all memory worked fine. I was really ... socketed so I can' t test them on the other board ... -
Spectrum 48K - upper memory MIAI have recently acquired a ZX Spectrum which, according to the sticker on the bottom, should be a 48K model. It's an Issue 3 board, with upper memory…
... Issue 3 board, with upper memory chips (8xTI4532) and supporting logic ... does not see the extended memory. PRINT PEEK 23732 + PEEK 23733 ... -
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... the game Chaos as one test. The problem also becomes much ... from a different, but related memory location when the incorrect pixels ... /> I can only suppose that memory access timings for the 5C112E ... ULAs that may affect their memory access. I rather suspect there ...
