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Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... +1 now![/CODE]
Read the code if you want ... they give a data whenever there is a memory access to 0000 ... -3FFF no matter if it's a read ... ROM memory location, everytime a write access happens, the ROM data bus ... -
PlusD Mini: implementing the CPLDI am doing my first attempts on creating a CPLD to use as replacement for the PlusD's GAL (and other logic lateron). I use the Xilinx XC9500XL series…
... select the +D's memory are inverted from their ... out, either no other memory is active in the ... lower 16K, or the memory that is getting paged contains ... read and there's no selected chip that's putting data ... across the entirety of memory with each execution of ... -
Relocating a block of code as to work on a 16k spectrumI've written a game in from 50000 to 65535 and was wondering if there were any way to relocate the entire block of code to work on a 16k Spectrum. I…
... registers that reply memory read. This would also effect data when udg's ... -
Compiling Lisp to Z80.I am doing some thought experiments on this. Here is an example of a Lisp program. It adds two numbers together. [code] (define (add x y) (if (= …
... wide variety of built-in data types that LISP actually supports ... variables which would reside in memory rather than registers. Each variable ... =String etc.) followed by the data itself.
ZX ... of the Spectrum manual[/url] (read from the line [i]"The ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... the time from the last memory access before pulling RAS down ... , as there's no separated data bus for VRAM and Z80 ... I/O data. For the ULA to know ... about to start a video memory read. During that time, the address ... -
Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…
... on the fact that its memory contents relate closely to those ... Chip was switching the data to fast, causing data corruption. When the ... package that I used. Also read the user manual. Rocky has ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... the time from the last memory access before pulling RAS ... as there's no separated data bus for VRAM and Z80 ... I/O data. For the ULA to know ... about to start a video memory read. During that time, the ... single four-byte page-mode read the ULA does two ... -
Spectrum 128k +2 grey and EPROMhi all, i am try to fix my spectrum, right now i am little on dead end... i think a good idea is to test RAM/ROM on the Spectrum so i will try to c…
... existing Spectrum ROM's into memory, so the EPROM for ... is a problem with the data / address or control lines ... Z80 will then only read rubbish and so will ... EPROM programmer, you can read the contents of the ... printer port, you can read the ROM contents into the ... -
Spectrum 128k +2 grey and EPROMhi all, i am try to fix my spectrum, right now i am little on dead end... i think a good idea is to test RAM/ROM on the Spectrum so i will try to c…
... existing Spectrum ROM's into memory, so the EPROM for ... is a problem with the data / address or control lines ... Z80 will then only read rubbish and so will ... EPROM programmer, you can read the contents of the ... printer port, you can read the ROM contents into the ... -
Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…
... place mouse driver in extended memory pages, but this software will ... set pull-up on data bus and CPU read always #FF on ... -
Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... you want your code or data at particular locations, that's ... code directly laid out in memory, many Spectrum emulators will come ... need to be able to read instructions directly from the hex ... -
Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... back in the 80s, using DATA statements - decimal numbers though, ... that I used to read the data in, it allowed code ... was read, so I could use it in the DATA values ... and poking it into memory as a 16-bit ... to include text in the data values (DATA T, "blah"), change ... -
+2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…
... the main memory, and then we have uncontended memory "upper" memory with the ... confused.
From the KM4164B data sheet: "64K x 1 Bit ... decoded NMOS Dynamic Random Access Memory organized as 65,536 one ... bank.
Have another read of my last post [URL ... -
New presentation for ZX Spectrum: "New Wave"DOWNLOAD: [url]http://pouet.net/prod.php?which=61133[/url] [img]http://pouet.net/screenshots/61133.png[/img] Enjoy.
... OUT CODE " DRAW ",NOT PI: READ a$: RANDOMIZE USR VAL "15363 ... ": GO TO PI
5 DATA "initial","tzoom","tride","pila","msh1 ... forced me to use some memory saving techniques. -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
... the NMOS version, meaning sometimes data can "leak through" the bus ... of the lower memory it is trying to read. It doesn't ... -
ReRun - Speccy OutRun done better[IMG]http://img.photobucket.com/albums/v661/Swainy_boy/outrundelux_zpsb772e8cd.gif[/IMG] Any takers? Smaller sprites, faster game.
... . ZX computer contain very small memory and games are limited - very ... of graphic data for each screen. CPU can read graphic data direct to ... , etc... Graphic data will on IDE device and ZX memory is free ... -
pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
... it needs a lot of memory (in Spectrum terms). It's ... it needs several meg of memory for any decent sized game ... map, it ran out of memory; but when making it 1024 ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... emulator, then save it from memory to file.
For ... : READ a: POKE 40000+f,a: NEXT f
30 DATA 255 ... .zx7" that contains the compressed data.
[*] Finally ... that will contain the compressed data, and decompress it into an ... -
running this game in zxspin assemblerHello all I've written this game out in the zxpin assembler. [url]http://chuntey.wordpress.com/2010/01/12/tutorial-zx-spectrum-machine-code-game-30-m…
... pointer is* (the 'notebook' of memory address that are CALLed and ... up to the top of memory. Though when you're starting ... byte of data is inserted into the specrum's memory for it ... my opinion it should be read in conjunction with Jonathan Cauldwell ... -
pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
... read about (or figure out yourself) that attempt to stay in memory ... limits too. If you need asm data structures, there ... drive. I used a heap data structure for my A* implementation ... -
Timex 2048 + Interface 2When playing with ZXC3 cartridge (very nice piece of HW from Paul - highly recommended), I connected original Sinclair IF2 to TC2048 and... no joysti…
... . If the PORT I/O, READ and A0 lines go low ... joystick can ground the relevant data lines.
In the ... cartridge if it's a memory read in the first 16K of ... -
Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... standard 64k adt library (data structures library, similar idea ... little guffaw each time they read it :) His idea of ... temporary objects on performance and memory requirements, and on what ... has predictable execution time and memory requirements.
... -
New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…
... the bus might get ULA data in them, then put the ... calculator, convert to hex, and read off the least significant digit ... is not yet reading video memory, hence the top 8 bits ... -
Idk>le me browsing through some game's code >..... [code]61A8 F5 push af 61A9 3EFF ld a,FF 61AB D37F out (7F),a 61AD D33F ou…
... ) = load a block of data into memory from the remote machine (which ... followed by the data)
BA (6289) = read two words (jump ... remote machine
B9 (6246) = read the saved register block from ... 6234) = read a byte and write it to the 128K memory paging ... -
SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…
... 64K array - one byte per memory location (so 48K only at ... /> // bit 2 -> Set if data read from here
// bit 3 ... -> Set if data written to here
// bits ... -
SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…
... /> // bit 2 -> Set if data read from here
// bit 3 ... /> // bit 4 -> Set if data read from here as second byte ... the purpose of a certain memory address. Notice the same address ... the second, if the same memory area is reused for multiple ... -
SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…
... Spectaculator due to all memory read and writes being 8- ... identify whether a byte read or write is part ... of a 16-bit read or write sequence.
... are code, which are data and which are unused.
data so that each memory address takes ... -
Games/Programs making use of DivIDE featuresHello :) I have a question: I may be wrong, but it looks like the DivIDE and similar interfaces for the ZX Spectrum are almost exclusively used for …
... . You'll be able to read/write to files using any ... . Another option could be doing read/writes via TR-DOS, any ... those options could allow more data without using compression (unless you ... need badly to have that data in memory at all times). Using ... -
Games/Programs making use of DivIDE featuresHello :) I have a question: I may be wrong, but it looks like the DivIDE and similar interfaces for the ZX Spectrum are almost exclusively used for …
... 'll be able to read/write to files using ... Another option could be doing read/writes via TR-DOS, ... interest to people who can read Russian.
[ ... badly to have that data in memory at all times).[/QUOTE ... to run in uncontended memory. This rules out the ...
