Search found 14 matches

by 2late
Fri Jul 19, 2019 1:42 am
Forum: ZX Spectrum Lounge
Topic: X and Y
Replies: 27
Views: 4123

Re: X and Y

Crayon21 wrote:
Sat Jun 15, 2019 11:31 pm
BTW, how do i save drawings as Jpeg or other using Fuse?
I simply make a screen copy with https://www.gimp.org/
by 2late
Fri Jul 19, 2019 1:38 am
Forum: ZX Spectrum Lounge
Topic: X and Y
Replies: 27
Views: 4123

Re: X and Y

what are all the numbers for? positions? kinda lost here Yes, the numbers are positions. Leaving alone the input lines, PRINT AT goes "the other way round" as PLOT in two ways. PLOT has a mathematical system where the horizontal position is counted left to right and is the first argument of PLOT. P...
by 2late
Thu Jul 18, 2019 11:47 pm
Forum: Development
Topic: Error which can not possibly exist in z80asm Version 1.8
Replies: 8
Views: 1107

Re: Error which can not possibly exist in z80asm Version 1.8

The issue has been resolved by word of God.

It seems that using an incorrect syntax for some IX commands like

Code: Select all

LD (IX),A
instead of

Code: Select all

LD (IX+0),A
you get this strange error messages about IY and SP.

Thanks to all who contributed to the discussion and the solution.
by 2late
Thu Jul 18, 2019 4:52 pm
Forum: Development
Topic: Error which can not possibly exist in z80asm Version 1.8
Replies: 8
Views: 1107

Re: Error which can not possibly exist in z80asm Version 1.8

Or it's an OCR issus… "0"="o"... "I"="1" or "L"... I typed everything in with my bare hands. That's how we oldtimers do things. https://www.memecenter.com/fun/2086225/old-timers Or it's the Spectrum ASCII page code, were any codes like "£" are at the wrong place in the IBM ASCII table. On the other...
by 2late
Wed Jul 17, 2019 4:46 pm
Forum: Development
Topic: Error which can not possibly exist in z80asm Version 1.8
Replies: 8
Views: 1107

Re: Error which can not possibly exist in z80asm Version 1.8

Sorry for my answer which will be useless with regard to your psedo … I fear, you are right. shift.zas:1386: error: unable to resolve reference: iy Nerver set a label : "A:","SP:", "HL:","BC" … in your code. The lower/hupper case may give a wrong label jump. I don't deny that this is good advice, B...
by 2late
Tue Jul 16, 2019 6:18 pm
Forum: Development
Topic: Error which can not possibly exist in z80asm Version 1.8
Replies: 8
Views: 1107

Error which can not possibly exist in z80asm Version 1.8

The error message tells me. shift.zas:1386: error: unable to resolve reference: iy As far as I understand this could happen e.g. with jrz r,iy because here the iy would be interpreted as a variable or a lable or so. The strange thing is, that a text search uncovers not one single iy in the source fi...
by 2late
Mon May 13, 2019 12:38 am
Forum: Development
Topic: old magazine article -- interesting ! ??
Replies: 16
Views: 3690

Re: old magazine article -- interesting ! ??

It seems building this unit is useless unless someone has the content of the EPROM Operation System Software sold from the magazine. I built such a thing, also using a 8255, because they where easier to program and cheap as sh*t compared to the fancy Z80PIO. EPROM-programming software is trivial. Y...
by 2late
Sun May 12, 2019 2:13 pm
Forum: Development
Topic: Using sll with z80asm Version 1.8
Replies: 4
Views: 949

Re: Using sll with z80asm Version 1.8

There is lots of information on the Z80 and it’s instruction set on http://www.z80.info/ ;) Thanks. I also used http://clrhome.org/table/# but the mouse over fly out always goes to the right i.e. goes over the edge of my screen for the right most column. Also all jr and jp instructions have the sam...
by 2late
Tue Apr 30, 2019 12:09 pm
Forum: ZX BASIC
Topic: Is there a ZX80 BASIC ROM for the ZX Spectrum 48k?
Replies: 2
Views: 1187

Re: Is there a ZX80 BASIC ROM for ZX Spectrum 48k?

Thanks a lot for the link.
It seems that I'll have to try it on an emulator first.
by 2late
Sat Apr 27, 2019 4:34 pm
Forum: Development
Topic: How to Build a keystick port internally to zx81
Replies: 5
Views: 932

Re: How to Build a keystick port internally to zx81

I should have noted, that this used no commercial joystick, but microswitches connected to the lines for the cursor keys.