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Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... 33000
ld a,1 ; lower screen
call 5633 ; open ... lower channel
ld de,string ; ... to ld 1 or 2 (lower or upper screen) then call ... , but is a good and memory efficient way, the more you ... -
Last Sunset for LatticaHere's a [b]rough first draft[/b] of the [url=http://www.users.globalnet.co.uk/~jg27paw4/pourri/lattica.gif]Lattica map[/url], just to demonstrate th…
... diagonal:
[LIST]
[*] lower left corner in level 2 ... border in level 3
[*] lower side border in level 3 ... (certainly some empty area in memory).
It could ... is coincidentally mapped from the memory area where the bouncing off ... -
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…
... ]
Just add the lower 11 bits (non-zero based ... how are these chunks of memory mapped into colors/positions of ... display (offset 16384 of speccy memory). Let's call it byte ... the speccy state including the memory and registers.
[quote ... -
Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…
... machine powered up, the lower RAM (4116 memory) can become faulty, the ... -
Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…
... machine powered up, the lower RAM (4116 memory) can become faulty, the ... -
rubber key Spectrum 48k problem :(when i plug the spectrum in all i get is a black screen with a red border and sometimes flashing blocks. the spectrum worked until about 20 mins ago…
... ] the voltages on the 16K lower RAM. You should get pin ... an EPROM burner, stick a memory test ROM in a Multiface ... to have to keep remove lower RAM chips until you find ... -
binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…
... which partitions the Spectrum's memory into sections (those familiar with ... etc). I mark out the lower 16K RAM, the screen area ... beautifully, with no gaps, maximising memory use and also honouring the ... the source and can maximise memory use - You know the ... -
Rom Cartridge - How does it work?So I've got me an IF2 and it has this ROM cartridge slot. How does it work? I read Paul Farrows site but one question remains unanswered. If I have o…
... 48k to which part of memory does cartridge map itself? Is ... fancy ROM replacement?[/QUOTE]
Yes, the only memory locations that ... -
ice creams/lollies etc...I haven't really eaten these in years but the weather is headed in that direction and I feel like maybe indulging in a few this summer... my 2 all t…
... ]http://www.doyouremember.co.uk/memory.php?memID=4460[/url]
replacement when I gave up. (they ... -
I might try building a barebones PC.Our Packard Bell iMedia 5077 is literally on its last legs. Every time it is switched on something doesn't work, usually it is the sound, sometimes i…
... by getting free replacement of motherboards, power supplies, memory and anything that ... -
I might try building a barebones PC.Our Packard Bell iMedia 5077 is literally on its last legs. Every time it is switched on something doesn't work, usually it is the sound, sometimes i…
... by getting free replacement of motherboards, power supplies, memory and anything that ... -
List of existing games that needs a port to zx spectrumPlease post here the games that exist in other platform(s) but does not exist in speccy. Please keep in mind this is not a to-do list, so don't hesti…
... smallerer too. The amount of memory transfers is extremly small for ... /rotation and as an optimised replacement it did it 10 times ... ageing system. Hasn't any replacement like this been attempted for ... -
"NVDI is a replacement for much of the code ... -
Legend of Kyrandia - ZX Spectrum DemoI was browsing the ZX Open Source site [url]http://opensourcezx.untergrund.net/[/url] and I found an interesting tr-dos disk image of a playable demo…
... the fence, his priority is lower than the fence's INK ... screen could be stored in memory as compressed data, decompressing each ... guessing it will take 5 memory banks of the Spectrum 128K ... -
Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…
... ", but loaded 7,749 bytes lower down from where it's ... /> Is there enough space in memory to load (and use) the ... -
Spectrum not working, can anyone help this lady?[URL="http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152"]http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152[/URL]
... has to be with the memory (which it's the most ... a damaged RAM in the lower bank. If not, it's ... rails, and if the 16K lower RAM bank is not being ... -
Spectrum not working, can anyone help this lady?[URL="http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152"]http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152[/URL]
... lower ram chips will be dead (and will just fry a replacement ... which (currently) there is no replacement besides other broken spectrums. This ... -
Most colourful games?I just played [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0001563]Earth Shaker[/url] and am fairly dazzled by the overload use of colour (t…
... ;552686]The C128 (with more memory and the 8502 cpu) could ... off during the upper and lower borders doubles the speed for ... -
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…
... a completely analogous way to memory emulation) and treat them as ... peripherals only care about the lower part of it (so the ... -
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…
... read the border in the lower three bits. This means that ... have to do 32,768 memory writes.
Every time ... -
Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …
... /> * Using VAL "number" to reduce memory use
* Using single variables ... program
2) A replacement for INPUT feels like a ... -
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…
... />
- always fill lower 16KB of my memory with ROM
- if ... -
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…
... in three places, all in lower part of the screen (one ... 't mess up with video memory though it looks so. If ... registers and doesn't modify memory), then how can the caption ... move? There are no video memory writes, so how can screen ... -
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…
[QUOTE]
How about your OUT emulation?
[/QUOTE]
It's very simple:
[CODE]
void write_to_port(unsigned int port_number,unsigned char value)
{
if(!(port_number % 2))
ULA=value;
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…
... attempts to access memory addresses greater than 65535/lower than 0 and ... access some value beyond my memory array without knowing it ... didn't even provoke a "memory access violation" system message ( ... I only read from that memory location instead of writing ...try to fix issue 4 board problemHi I try to fix speccy 48. All voltages are in place, ula 100% ok, cutted +5v from ic25 so far no luck. What next? ROM or upper memory? wojtek (i…
If voltages ok, then 4116 lower 16K memory (most likely) or ROM.
It's tricky to tell.... Do the 4116's get hot?Greetings all overheat problemsfirstly hello everybody and thanks for adding me to the forum dont know if ill be much use here but i hope so the problem i have or should i say a…
... [/URL], its a drop in replacement, its a little bit more ... the RAM, after testing each memory chip, I was at square ...Z80 sound enginesI'm looking for a decent sound engine to use in a Z80 program I'm writing, but I've no idea which is the best/fastest/easiest to use. I could do wit…
... that will take all the memory but will consume ~1000t to ... of 0s and 1s to lower the pitch of the sound ...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 …
... , but discarding a Spectrum's lower 16K RAM as 'non-existent ... random accessible, readable & writable memory, and the Z80 doesn't ... data, the rest of the lower 16K only has non-constant ... complex topic. :)[/QUOTE]
Virtual memory can be made as simple ...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 …
... RAM. It's Random Access Memory - you can read it, you ... very same chip that the lower 16Kb. You can run code ...Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... levels across both the 8 lower RAM chips and the 8 ... been trying to source some replacement caps but it seems that ... replacements? I can source a replacement VR from the Maplin's ... , if I can source a replacement somewhere! That's when the ...
