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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 ... -
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 ... -
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 ... -
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).
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…
... fail as the first three 16K memory banks are contended.
patch: ld e,(hl) ; Read address into DE
inc ... /> ld c,(hl) ; Read count into C, B = ... br />
; 12 BYTE memory remap table.
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…
... of the C register with READ/WRITE or the use of ... DOS READ description says "The destination buffer is in the following memory ... is visible in the top 16k during read/write, so if you ...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.
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…
... way to exploit the extra memory is to use those banks ... of RAM where the screen memory normally sits. The bottom of ... bottom 16K of memory, where the screen is pulled from, means that memory read ... the screen being read out affects half of the memory banks. And ...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 ...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 ...Wrong-endian data table?I'm drawing up the memory map for something I'm writing. I'll be using machine code on a byte array of 256 elements, each element consisting of 64 by…
I'm drawing up the memory map for something I'm ... [/b], and it can be read using [b]LD A, (HL ... would be working against the memory read cache. Not an issue with ...Former maker of Sinclair add-ons in the U.SIn my continuing efforts to find people from the Timex-Sinclair past I found two gentleman who were, at some point, the owners of Byte- Back. This …
... a modem, a 16k and a 64K memory module and an input ... /> Jerry Minchey started with the 16K memory, and then the modem and ...
the UM-64 ultimate memory with battery backup and the ...ZX 81 Collection on ebayHi guys. Just to let you know I have decided to sell my ZX81 collection. I'm just sticking with the speccy from now on so the ZX-81 is going this we…
Question about DivIDEHi guys, Tell me this... (please) DivIDE features an "auto-mapping feature transparently maps shadow ROM at important entry points". Depending on …
... ?
For example, from memory, Fatware will load FAT based ... 1366 is access as a memory read.
However, other firmwares ...ROM switch on NMIHello! Please, help me or point in the right direction. I am building a project for 48k spectrum which must activate its rom (actually static ram) …
... M1 goes
low and memory read request for the intruction fetch ...New game: The Speccies 2This is out too. :D [URL="http://tardis.dk/wordpress/?page_id=1060"][IMG]http://tardis.dk/retro/speccies2/images/Logo.png[/IMG][/URL] [URL="http://…
... and is for the 16K Spectrum.
Read more - and download ...FS: MOSTEK 4116 DRAM for 48k SpeccysHi I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in their origin…
... Speccy - fits in the lower 16k memory bank. They look like NOS ...48k Stops loading and resetsI've just fixed the problem I had with my Issue 2 Spectrum only showing 16k memory by replacing all of the upper ram. With that job done I've done a …
... Issue 2 Spectrum only showing 16k memory by replacing all of the ... done I've done a memory check and its now returning ... is that I can load 16k programs OK but when I ...Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
... there is both memory and I/O contention. Memory contention causes T1 ... ULA has performed its video memory read. But there is also one ... safe" zone between two video memory read bursts. If I'm right ... 00FE for instance, to avoid memory contention) that begins at the ...Fuse tests - INC BC causes contention delayHi all, In the FUSE test suite it has the following for the output of opCode 0x3 (INC BC): 0 MC 0000 4 MR 0000 03 4 MC 0001 …
... one of MR (memory read), MW (memory write), MC (memory
contend), ... PR (port read), PW ( ... is the byte written or read. Missing for contentions.
read the memory to update the ...Biggest ZX collection ever offered for sale on the internet !!!The most COMPLETE ZX SPECTRUM collection ever offered for sale on the internet! It took me years to collect everything, to make sure I have every …
...
Joystick interface - x5
16K memory expansion for ZX81 - x1
Sinclair ZX Spectrum 16k - superb/boxed - x1
Sinclair ...ZX81 Ram pack problemI got recently Sinclair 16k memory expansion for my ZX81, but for some reason it will not work. The computer itself is operating normally without hi…
I got recently Sinclair 16k memory expansion for my ZX81, but ...Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…
... 'm having problems understanding the memory contention in 48k, in instructions ... 5 memory contentions there? It's like it's trying to read ... 5 times from memory when you already have the memory read result ...Crap facts..Not going to win a pub quiz with this one, but did you know that LINUX wouldn't exist without the QL? Linus Torvaldus (I think thats how its spelt!)…
Douglas Adams is known to have created his masterpieces on an Apple machine, but there are references in his book "Dirk Gently's Holistic Detective Agency" to a "machine with 16K memory". I wonder if he was referring to a ZX Speccy...?Z80 core testing ?OK, my z80 core is almost finished (apart from RRD, RLD, and block instructions except LDI,LDIR,LDD,LDDR). I run the 48K rom and hurray, it resets co…
... lines specifying the initial memory setup. Each has the ... of MR (memory read), MW (memory write), MC (memory contend), PR (port read), PW ... /> is the byte written or read. Missing for contentions.
... specifying which bits of memory have changed since the ...
