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Will an interface 1 work with a +2?I don't want to break anything, can I bugger up the +2 by connecting an interface 1 and microdrive to it? Are they compatible? If they are, with no…
... is paged in and that system variables are created in a bug ... only either initialize the extra system variables or close the specified stream ... -
List of POKEs and PEEKs/cool memory addressesI was wondering if there was a list of cool memory addresses to POKE and/or PEEK. For example, I know that PEEK 23674 tells you how long a Speccy has…
... actually pokes that change the system variables or something in a Basic ... poked. It could crash the system. -
List of POKEs and PEEKs/cool memory addressesI was wondering if there was a list of cool memory addresses to POKE and/or PEEK. For example, I know that PEEK 23674 tells you how long a Speccy has…
The system variables area provides the most interesting ... .
Full list of system variables and descriptions can be found ... .g. changing CHARS or UDG variables to point to a user ... -
Reading the border colorI am building a snap-button to my ZX-PC Interface. Is there a way to read the bordercolor which is set by an OUT-command. (and please don't tell me …
... it in one of the system variables but that will only work ... -
How did games started with LOAD "" CODE auto-start?Some early games (l remember for example [B]Galaxians[/B] from 1982) was loaded with LOAD "" CODE, which in one single block first loaded the loading…
... /> Simply put, Galaxians loads the system variables as well as the program ... , and included in these variables is the one for "jump ... -
How did games started with LOAD "" CODE auto-start?Some early games (l remember for example [B]Galaxians[/B] from 1982) was loaded with LOAD "" CODE, which in one single block first loaded the loading…
Since this trick is done while BASIC interpreter is running, we don't need to store registers. BASIC system variables are enough. Anyway, loading and saving procedures scratch most of registers. -
How did games started with LOAD "" CODE auto-start?Some early games (l remember for example [B]Galaxians[/B] from 1982) was loaded with LOAD "" CODE, which in one single block first loaded the loading…
Point is in loading system variables - there are those for jump ... />
Little harder is loading system where stack is overwritten - it ... -
How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... the [B]LAST K[/B] system variable, that is only gives ... IY register points into the system variables area. If you leave the ... -
Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…
... all of a sudden, the system variables are going to go away ... -
A challenge thats probably impossiblehere's a challenge for all you coders. Given a snapshot, is it possible to create a program to sniff out the original start address for the game that…
... is usually just after the system variables area about 24000 or so ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... see on the screen, the system variables and in the case of ... -
Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …
... available ram and overwrite the system variables, causing a reset if a ... -
Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …
... checked the purpose of these system variables, but I still don't ... -
Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …
... checked the purpose of these system variables, but I still don't ... . The address yields the BASIC variables memory start address. So it ... -
Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …
... regular ram with all the system variables and with a lenght long ... -
Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …
... regular ram with all the system variables and with a lenght long ... , the program counter (PC) and variables will be intact when loaded ... -
Using a multiface to exit to BasicBack in the days I was always fascinated with the idea of getting access to BASIC listings inside a program or game. I was able to work a way around …
... regular ram with all the system variables and with a lenght long ... it's unbalanced, then the system goes bananas. Simple as that ... -
I forgot which system variable I need...... to prevent the message 'start tape, then press any key'. I saw the system variables list but it's not helping. I know I used one poke to bypass t…
... any key'. I saw the system variables list but it's not ... -
I forgot which system variable I need...... to prevent the message 'start tape, then press any key'. I saw the system variables list but it's not helping. I know I used one poke to bypass t…
It is not system variables but the channels which you ... -
IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…
It points to the system variables, so changing it makes the system think to look elsewhere for its all important workspace.(for BASIC)
mind explaining what the problems are, or give us an assembly listing? -
IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…
... address system variables. Probably it was supposed at some point that system variables can ... only partially. At some places variables are addressed via IY, at ... , not in all places. Some variables are still addressed directly. However ... -
ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... reading and writing to the system variables.
Of course this ... -
Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... activity in this gap - the system variables getting updated once per interrupt ... -
How could you hear if loading BASIC or MC?When loading a Spectrum program from tape you could usually hear from the sound if it is a BASIC or is some machine code program *. My question is, w…
... 's easily recognisable is the system variables area in programs that had ... -
TS2068 stuffTo the Spectrum gurus of the forum :D With the release of Fuse 0.9.0 I've been trying some games in TS2068 mode, to later try them on my real 2068. …
... basic reserves more ram for system variables and reserves space for some ... -
Z80 from a ZX81 in a Spectrum?Can I put a Z80 from a ZX81 into a Spectrum 48K? It should work even if they both are clocked differently (3.25MHz vs. 3.5MHz AFAIK), right? Thanks,…
You might get a different result to what you were expecting though, especially if you use ROM routines or system variables, and remember that the ZX81's character-set was not ASCII but it's own. -
Z80 from a ZX81 in a Spectrum?Can I put a Z80 from a ZX81 into a Spectrum 48K? It should work even if they both are clocked differently (3.25MHz vs. 3.5MHz AFAIK), right? Thanks,…
... you use ROM routines or system variables, and remember that the ZX81 ... -
Z80 from a ZX81 in a Spectrum?Can I put a Z80 from a ZX81 into a Spectrum 48K? It should work even if they both are clocked differently (3.25MHz vs. 3.5MHz AFAIK), right? Thanks,…
... you use ROM routines or system variables, and remember that the ZX81 ... -
Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... the frame value in the system variables (amongst over things), but you ...
