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Odd files on disk games (Op.Wolf, Typhoon, etc.)I've noticed on some disk games which I've been looking at recently that the loading sequence starts by loading two 512 byte files and comparing them…
... weak sectors, where part of cyl 0 sector 2 ... crashes -- often by filling RAM like you're seeing.< ... protection by changing the last byte in the sector data ... that change. Newer dumps of these titles can contain ... 3 samples of the changing sector data, ... -
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…
... them in at the bottom of RAM where the screen memory normally ... sits. The bottom of RAM is always the same fixed ... 16K guaranteed to always be available and always have the fastest ... 's the first byte of the second 16K chunk of RAM, just beyond the ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... /> [CODE].attrs:equ 0xfd00 ; last 768 bytes of RAM
;; start loading ... ,ixh ; look at the high byte of the pointer
and a ... ; point at the beginning of the video RAM
ret[/CODE]
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... ' routine can use characters from RAM as well as ROM.
last bit of a byte loads" execution path is ...The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…
... (the first 40 bytes of the data are the first ... ]ridiculously[/i] small amount of processor time on that machine ... so the play area of a game can be ... and 2 have less space available because 4K is "seen" ... sit on 64 byte boundaries so the last byte is never visible ...Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
... /> So, basically, the last bit of the IO address bus (which ... bit) is controlling the RAM page. However, the ... to stay up, instead of requiring the /IOREQ signal ... access), which isn't available on the chips they ... switch the whole bloody RAM page and have ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... d, e ; set high byte of top of RAM
ld (de), ... br /> dec hl ; last location of channel data
ld ... reports.txt" ; each message has last character inverted
... (hl), c ; least significant byte of length
dec hl ; ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... pointer
call test_room ; check available memory
pop hl ; unstack ... ; add one for the inclusive byte
add hl, de ; restore ... HL
dec hl ; last location of workspace to HL
call ...How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... the screen address. (or any RAM address)
An integer is ... />
H is the high byte of the screen address integer
L is the low byte of the screen address integer
the last 3 bits of the high byte represent which pixel line of the ...Is ESXDOS flexible enough to incorporate e.g. Spectranet commands?I was just discussing the idea with someone about the wish some people have to be able to combine interfaces such as DivIDE (Plus) / DivMMC EnJOY! wi…
... that means lots and lots of one byte READs.
[/quote]< ... de = void *buffer_ptr (address past last byte written)
; bc = remaining space ... the stream is relieved of a number of any size in chars ... empty etc) to speccy ram that is going to mean ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... btime on a Pentagon are available here: [url]http:// ... the emulators is the last part of the Russian demo ... reading a byte from raster and a byte from the ... every t-state (one byte per t-state, interleaved, ... read of a raster byte and one read of an attr byte per ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... one read of a raster byte and one read of an attr byte per ... tuning the emulators is the last part of the Russian demo called ... read? Or is always the last value read returned? Does the ... we could have only dream of before available to figure this out ...ZX Alien BreedNot sure if this has been mentioned already (I did trawl the threads but couldn't see anything :smile: ), but I've always hankered after a Speccy Ali…
... why make up a 230 byte limit to begin with? It ... you'll be wasting most of your available memory.
... and use whatever amount of bytes it takes...I ... right.. The limit sort of came about as I ... maps as possible into the available RAM. Obviously I had the ...displaying all memory activity in a screenDunno why I keep thinking about this, but here goes Is it easy enough to add a screen to an emulator that shows every memory address' activity.... …
... /> [*]Performing an XOR of the last byte written to this location with ... the byte being written
... frame of the monitor refresh, treat the emulated RAM as a ... the green index, per-byte write activity as red strips ...48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
... means that 32767 is the last working memory location. So the ... only 16k bytes of RAM. Remember the first 16k of memory is ROM ... the 32k bytes of "upper" RAM.
The type of RAM chips used ... of the eight data bits that make up a 8 bit byte ...ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... less common to find the RAM chip(s) socketed.
Three different RAM chip types were used. Timex ... single 24-pin 2k byte RAM chip. ZX81s had either ... br /> The best and last ULA version is the ... and effectively changes one byte of the ROM code so ...Sinclair Today...Based on your experiences and knowledge of how Sinclair Research operated back in the 1980s, if they were to announce a new Sinclair branded PC or La…
... /> [/LIST]
Now of course, the last two of these improvements would have ... change to the RAM (it's already two sets of eight 64k ... , need two 32k byte chips instead of one 16k byte and one 32k ... one QL, and with a RAM memory and disk drive expansion ...Action BikerBeen playing Action Biker across the Speccy, C64 and Atari and have done a review at - [URL="https://www.youtube.com/watch?v=vZIbwDBYneY"]https://www…
... both the screen and colour RAM each time). Getting the ... is tougher, taking most of the available CPU grind to get ... that shudder at the bottom of the play area is the ... kind of mistake only a beginner ... fixed by [i]changing one byte[/i] with a hex ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... BLOCK
#define FCB .BYTE
#define FCC .TEXT< ...
org $2B00 ; free RAM on Atom
... program to demonstrate the use of
;* routines ... #'~' ; are we past the last character in the font?
How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…
... the CPU as a single byte, that is write only ... areas / sections / banks of RAM (or ROM) become available to the CPU.
of RAM. I/O port 1 ... (say the lower half of the RAM chip), is mapped to ... maps the other half of the RAM chip to to CPU ...Question - SAMS Timex Sinclair 2068 Beginner/Intermediate GuideHi all, I just acquired a T/S 2068 and the a book that came with it is, SAMS Timex Sinclair 2068 Beginner/Intermediate Guide. On page 18 of thi…
... machine without much of any thought of software compatibility. Doing ... from their dealers because of shrinking profit margins (the ... because there is less RAM available for Basic in the ... differences that cause those last percent incompatibility. Most important ...The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... There are 8 bytes of code available for each RST. To ... if call emanated from RAM (i.e. from ... location in ROM or RAM for debugger itself[/u ... described above (minimal set of commands for monitor: ready, ... other ideas?
Last but not least - it will ...What is needed to get a high standard , "emulator focused" PC?The implication I am making is that a normal PC can be improved on emulation wise by building in some emulation friendly features . But this could be…
... resolution on hd tvs, lots of software available.. for basic stuff it ... for machines with 1gb, 2gb ram (3gb at most as ... pc for heavy ram consuming software? processors of these boxes seem ... />
As for WinXp, the last freeware Spectaculator works well on ...
