Search found 787 matches

by siggi
Sat Feb 17, 2018 1:47 pm
Forum: Welcome Area
Topic: ANDRE*** is back!
Replies: 10
Views: 178

Re: ANDRE*** is back!

Hi Andre***
I am happy that you are back again an I am curious about new Zeddy games :P

Siggi
by siggi
Wed Feb 14, 2018 11:07 am
Forum: Hardware
Topic: Internal RAM upgrade
Replies: 9
Views: 488

Re: Internal RAM upgrade

Not all!
At least the diodes connected to /M1 and /RFSH should be Germanium or Schottky (to keep the logic LOW level low enough).
by siggi
Tue Feb 13, 2018 10:51 am
Forum: Hardware
Topic: Internal RAM upgrade
Replies: 9
Views: 488

Re: Internal RAM upgrade

So what would you suggest for a bare bones 64K upgrade to a Zeddy?? I am building a parabot,(everyone else would call it a robot),I have a 8K NVRAM board already completed that will be in the 8192-16384 region to which I will use for the machine code routines... As written above: this memory expans...
by siggi
Mon Feb 05, 2018 11:55 am
Forum: Hardware
Topic: Internal RAM upgrade
Replies: 9
Views: 488

Re: Internal RAM upgrade

The only disadvantage of this solutions is, that the signal for ram-A15 is generated very simple. Thus the ram cannot be used for running machine code above 32K (that would require a more complex generation of ram-A15). In additon to that I would not connect ram-/OE to ram-/CE, but would use /RD AND...
by siggi
Thu Feb 01, 2018 12:16 pm
Forum: Development
Topic: Plot function in z88dk
Replies: 24
Views: 742

Re: Plot function in z88dk

The code snippet above is only an example, how parameters (plot coordinates) could be passed efficiently from C to ASM. This snippet does NOTHING, because the plot-code is not included (Andy's could be added after " LD B, E ; BC = yx" and "RET"/end of function).

HTH Siggi
by siggi
Tue Jan 30, 2018 9:24 am
Forum: Development
Topic: Plot function in z88dk
Replies: 24
Views: 742

Re: Plot function in Z88DK

The hires functions in graphics.h look very interesting as well, but I assume that this requires WRX, right? Yes, your hardware (or EO ;-) ) needs to support a HIRES modification. WRX is one of the easiest modifications: https://www.z88dk.org/wiki/doku.php?id=platform:zx81#high_resolution_graphics_...
by siggi
Mon Jan 29, 2018 7:28 pm
Forum: Development
Topic: Plot function in z88dk
Replies: 24
Views: 742

Re: Plot function in Z88DK

If you want to plot in LOWRES, you could call the BASIC PLOT routine from Z88DK to plot using BASIC: an expample for PLOT is here: https://www.z88dk.org/wiki/doku.php?id=library:zx81&s[]=zx81&s[]=plot If you want to plot in HIRES, use the "graphic"-library: https://www.z88dk.org/wiki/doku.php?id=lib...
by siggi
Mon Jan 29, 2018 9:49 am
Forum: ZX BASIC
Topic: PI or not PI, that is the question.
Replies: 6
Views: 275

Re: PI or not PI, that is the question.

Re: PI or not PI, that is the question.
The real question is

Code: Select all

10 if two beer or not two beer ....
:mrgreen:
Siggi
by siggi
Mon Jan 22, 2018 9:53 am
Forum: ZX BASIC
Topic: PI or not PI, that is the question.
Replies: 6
Views: 275

Re: PI or not PI, that is the question.

Variables can also contain SPACES:

Code: Select all

10 LET NOT PI = 0
20 PRINT NOT PI
:mrgreen: