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Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…
... that it's only lower 16K memory read/writes that are delayed; the ... per line there is no memory interference whatsoever, and the CPU ... multi-T-state instruction the read or write occurs. It's ... the screen; synchronising itself with memory writes. You see, you can ... -
New tool: ZXBOOT.EXE[B]ASM[/B] is proud to present the first release of ZXBOOT.EXE: [url]http://www.4shared.com/file/NP-FVOSf/zxboot__beta_.html[/url] ZXBOOT is a comma…
... below 32768 due to the memory remap algorithm using page 2 (32768..49151 ... fail as the first three 16K memory banks are contended.
patch: ld e,(hl) ; Read address into DE
inc ... hl
ld c,(hl) ; Read count into C, B = 0 ... -
Open and read a file using +3DOS in MCForgive me if this has been asked and answered before, I've spent a fair few hours searching the forums and looking for books on the subject, all wit…
... the C register with READ/WRITE or the use ... was loading at 32768 and the DOS READ description says "The ... destination buffer is in the following memory configuration ... (32768 ... top 16k during read/write, so if you're loading at 32768 ... -
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... of RAM where the screen memory normally sits. The bottom ... bottom 16K of memory, where the screen is pulled from, means that memory read ... screen being read out affects half of the memory banks. And ... start at address RANDOMIZE USR 32768? Even on a 48K ... -
Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any) Since the Interface 1 ROM is only 8k long, does anyone know what …
... what appears in the 8-16k memory range when IF1 is paged ... -
Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…
... a fully working issue 2 16k spectrum and a broken issue3 ... broken spectrum to the working 16k?
Anyway, Looking at ... !
I bought the 16k from a friend in 1988 ... -
How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…
... the PIC cant also read the lower addresses at ... its lower 16K separated from the higher order memory, THATS ... case) reads from the 16K memory and can display things ... not be read is when writing to the video memory, beautiful ... needs 1K of video memory and the second ... -
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"…
... LOAD *"m";1;"rom" CODE 32768[/CODE]
that allows us ... a copy of the first 16K of memory, where the shadow ROM ... copy of the first 16K to address 32768 and above, I ... hl,0
ld de,32768
ld bc,16384
Spectrum +2a memoryHi all, Happy New Year. A quick question, I have a Spectrum +2a that I am seeing a very intermittent fault, once every 20 - 30 power ups. I plug…
... seems to fail the lower 16K memory test.
Does anyone ...Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??
... partitioned the 64K memory space into chunks (16K chosen by Investronica ...
In each 16K of the 64K memory space, I could place ... whether it was read only or read/write in that 16K memory slot (instead ... to appear in the top 16K of memory.
The ...Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... page (that means write to memory, read memory or just execute instruction on ... : stack above 32768 (call,push,pop,ret acces memory on SP pointer ... parts of code above 32768, sound routines above 32768 (due exactly timing ...16k Spectrum.How come emulator's in 16k mode don't provide 32 ram-pack support.
... ]Isn't emulating a 16k Spectrum a bit pointless? ... since all the 16k software will run on ... CLEAR to adjust how much memory to use.[/QUOTE]
... never actually used a 16K Spectrum and have bid ... On an emulated 16K,
PRINT PEEK 32768 and PRINT PEEK ..."Lost" 48K expansionToday I dug up my Speccy after more than 10yrs of inactivity. I bought it as a 16K in 1983, than I had expanded to 48K and never had problem. Until t…
... was a short assembly language memory tester posted in the Development ... two sets of chips: lower memory (address 16384 to address ... RAM chips, and upper memory, from 32768 to 65535 which consists of ... chips get accessed simultaneously to read or write a byte.
Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... of this routine. Remember to read the documentation that comes with ... know the exact addresses in memory I can use, but as ... />
To copy SCREEN$ to memory address 32768
LD BC ... bytes long
LD DE 32768 ; somewhere convenient - change to ...4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
... had the same problem (lower 16K memory bad) and tried replacing it ... screen. Somehow the Z80 could read/write fine, but screen data ... the inverse of this signal (read: I added a single inverter ... are used (eg. as video memory for a TMS9918 chip).
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... ! Try running it for upper memory only - 32768 to 65535. Not sure ... help as Jetpac is a 16k program. You could try from ... 32767 to try the lower memory. 16384 to 23295 are probably ...Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …
... them up in the slow memory below 32768 and just copy the ... want to use into higher memory before I call it. Once ... of writes to the lower 16K and knocks the functions into ...Screen display at resetJust something for curiosity: When the Spectrum is reseted by for example NEW a very typical screen is shortly displayed. [IMG]http://i33.tinypic.c…
... ;384504]Is the 16k model using exactly the ... detects that some memory modules are missing and ... That is, does the 16k model know it is a ... 16k model? :)[/QUOTE]
No, it just detects no valid memory ... at 32768 and stops at ...Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…
After the above process, you'd have a TAP file containing a 16k ROM image. To load it into Spectrum memory at 32768, you'd use
[CODE]
CLEAR 32767
LOAD "" CODE 32768
[/CODE]
What you'd do with it after that is up to you.Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…
... /> Don't forget there is memory below 32768 available too (and quite ... music code stuff into top 16k
XREF music_routine< ... restore original bank into top 16k
pop hl ... 16k (address $c000 - $ffff). If you look back at the sp1 memory ...zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... the machine to load in 16k mode
as rom ... 16k of memory
16385-32768 - contested memory
32769-49152 - contested memory ... to figure out how the memory addresses tie to the actual ... memory IC's
...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... to a Targa file, upload memory to the 48K version of ... somewhere away from the last 16K and pushes the Spectrum end ... also reserves some other memory so 32768 is looking good for the ...Divide plusJust ordered one. Wonder if memory intensive games designed for russian clones can be run on 128 speccys taking advantage of the extra chips present?
... one.
Wonder if memory intensive games designed for russian ... [/url]
Check the memory layout. DivIDE+ pages its ... Spectrum 16K via expansion bus, so that the memory area 32768+ can ... be used for paging more memory.2 new games - Brian Vs the Bullies & BlitzIn case you've missed it in this thread ([url]http://www.worldofspectrum.org/forums/showthread.php?t=38962[/url]) I've uploaded 2 games to celebrate …
... the highest memory address available on a 16k speccy is 32768, this means ...Open and read a file using +3DOS in MCForgive me if this has been asked and answered before, I've spent a fair few hours searching the forums and looking for books on the subject, all wit…
... action" 1 - "open - read header - position after header", so ... the READ call gets the next ... loading at 32768 and the DOS READ description says ... "The destination buffer is in the following memory configuration ... (32768 ...SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... 16K (not 18K) of RAM, basically mirroring the Spectrum's lower (read ... ram onto one of its 16K memory banks. It does this my ... listening to "memory writes" to the spectrum video ... the contents of the SPECTRA memory back to the spectrum.
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 ... if it's a memory read in the first 16K of address space ...Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…
... means the 16k ROM :))
The memory map for a 16k RAM ZX ... RAM (end of 16k RAM)
8000 : 32768 empty (this is where ...ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... start to type in the memory test program
... if I didn't have 16k memory pack present). AND
... I did a small memory test program above RAMTOP ... - NO ERRORS whatsoever - all memory from 19456 o 32767 was ... than 3.5k of memory free (RAMTOP lower than ...
