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Get starting address of gameHi, Anyone know how to get the starting address of a game? I've looked at the TZX format and couldn't see anything obvious. I'd like to load the…
... condition of "PC>=16384". On 48k models once it starts ... . On 128k models the ROM executes code in the old printer buffer (also ... -
Get starting address of gameHi, Anyone know how to get the starting address of a game? I've looked at the TZX format and couldn't see anything obvious. I'd like to load the…
... condition of "PC>=16384". On 48k models once it starts ... . On 128k models the ROM executes code in the old printer buffer (also ... -
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…
... -screen demos I posted early on in the project. Have a ... mode), you also have the printer buffer to use as scratch space ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... = 23296 = the start of the printer buffer. If the attributes copy is ... there it'll overwrite the printer buffer ( fatal on the 128 ), all of ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... = 23296 = the start of the printer buffer. If the attributes copy is ... there it'll overwrite the printer buffer ( fatal on the 128 ), all of ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... will also walk into the printer buffer.
This is how ... />
if your spaceship stays the constant same colour and ... -
Beautiful codeSome people see beauty or something sublime in maths formulas and equations, can anyone suggest examples of beautiful or sublime programming?
... hires games in
1K. On the minigamecompo 2011/2012 you ... your code doesn't load on a 16k machine?[/QUOTE]
SP register content is different depending on RAM size. I ... -
Chuckie Ess 2 tap doesnt work[url]http://www.worldofspectrum.org/infoseekid.cgi?id=0000959[/url] It loads, you press a key and it returns to Basic! Anyone any idea why or got a …
... LOAD are from the computer on which the original tape file ... ), loads the CODE block, loops on KEY_SCAN until a key is ... to the start of the printer buffer - and crashes, because there's ... forget about the BASIC loader on the TAP file and just ... -
64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... which would take that buffer and render it on screen, using a ... number of bytes in the buffer.
[*] Even scrolling ... to switch alternate registers, rearrange SP, etc. But if you stored ... need to draw a pixel on the buffer, you will just need ... -
64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... number of bytes in the buffer.
[*] Even ... to switch alternate registers, rearrange SP, etc. But if you stored ... need to draw a pixel on the buffer, you will just need ... situations. Your proposed nibble buffer becomes more expensive to update ... -
Trailblazer Cheat ModeThere's a [URL="http://www.the-tipshop.co.uk/cgi-bin/info.pl?wosid=0000657"]familiar cheat mode[/URL] in Trailblazer... It's a bit convoluted to get…
... variable to point to the printer buffer, and then entering the word ... BOUNCY into the buffer
[youtube]pVRJEMAY_ww[/youtube ... you pressed the keys which on 128k games that use only ... -
What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…
... neglects to clear the ZX printer buffer and reset the associated system ... />
The 48k ROM page on the 128k models is not ... the original 48k ROM (particularly on the +3), which causes some ... , although routines have been posted on this forum which do allow ... -
What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…
... ) is ONERR routine (in ZX Printer buffer), that switches back ROM 1 ... a hardware difference; it says on the documentation that when outing ... -
What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…
... available speccy at the time) on a toastrack, does not lock ... , although issuing a SPECTRUM command on toastrack, in basic mode, does ... 128k paging code in the printer buffer so that it always clears ... -
What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…
... available speccy at the time) on a toastrack, does not lock ... , although issuing a SPECTRUM command on toastrack, in basic mode, does ... 128k paging code in the printer buffer so that it always clears ... -
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…
So to clarify, out of the 16K of RAM, you've got 6.9K or so used by the screen, then another 500 bytes or so for the printer buffer and system variables, so 8.5K is about all that's left on a 16K Spectrum.
B -
DEFFNder: a small library of BASIC functions written in Z80I've published a small library of 15 Sinclair BASIC functions written in Z80. I wrote it last year for a project of mine. Some of them are generic, s…
Whoops. My fault on the demo crashing on 128K.
Well spotted.< ... temp string storage which is printer buffer on 48K but is extra System ... Variables on 128K and caused a ... now use the DEFFNder code buffer as temporary string storage for ... -
Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…
... understand the 3rd (screen) block on tape: although
both the ...
overwritting system vars and printer buffer mostly reproducing ROM code to ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... 48KBytes it will overwrite itself on a 48KB machine.
printer buffer, or free stack space.
on same ROM bank, as application ... -
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…
... was made (the address is on the stack). If the address ... is to put it to printer buffer.
In 48K ROM ... that code will not work. Printer buffer between 5B00h (23296) and 5C00h ... -
"ZX80 Brain" RPN CalculatorIt is at times like [url=https://www.worldofspectrum.org/forums/discussion/54176/depression]when threads such as this are posted[/url] that I get the…
... of the calculator;
- ZX Printer listings for both the ZX80 ... zero; ABS has no effect on zero
- trigonometric functions ... it and the BRIGHT channel stays on until the next key press ... has anyone ever seen these on a scientific calculator, let alone ... -
disk access & other peripheral docs?The documentation at http://www.worldofspectrum.org/faq/reference/ and thereabouts is fairly complete when it comes to programming the speccys, but t…
... You'll also find information on the +3 from other sources ... example Residos probably has something on it.
[quote]< ... basic command in a buffer and store the buffer's address in ... capability use the printer buffer as 256-byte disk buffer. I don't ... -
disk access & other peripheral docs?The documentation at http://www.worldofspectrum.org/faq/reference/ and thereabouts is fairly complete when it comes to programming the speccys, but t…
... You'll also find information on the +3 from other sources ... example Residos probably has something on it.[/quote]
Haven't ... basic command in a buffer and store the buffer's address in ... capability use the printer buffer as 256-byte disk buffer. I don't ... -
shadow regs musingIn the process of optimising some assembler, it occurred to me how great it would have been if the Z80's shadow reg opcodes had been a bit more fully…
... going to use an extended register once, you will probably use ... a 'sticky' prefix instruction which stays on once it's used until ... -
[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... figure out what was going on at the stack+1 label ... bytes as well. Loading the SP register from a memory location is ... -
Tape to +3 disk transferWhen the first basic part was merged from tape, to be saved to disk, and it looked like this: [img]https://i.imgur.com/UQx1hc2.jpg[/img] how di…
... trying to run Nifty Lifty on the +3 is that it ... is only used for the printer buffer on the 48K.
I ... -
Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... /> With a single 4k buffer you can do Elite-style ... behind the beam. The buffer layout should be slightly different ... will be negligibly slower on average. Buffer transfer code is similar ... have to re-write the SP a lot. Is it ... Drawing lines into the buffer is. -
New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... within the screen area or printer buffer with options -b1,-b2 ... just don't work on the Spectrum +3 so ... there is a fixed version on there (http://www.alessandrogrussu ... 16k games where captured on a 48k machine which ... loader.tap it will autorun on a +3, catalogue ...
