Chroma 81 - SCART and Colour interface for the ZX81
Re: Chroma 81 - SCART and Colour interface for the ZX81
Looks great
Siggi
Siggi
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM
Re: Chroma 81 - SCART and Colour interface for the ZX81
Thank you ! I couldn't get up to here without the Olofsen's help
Do you mind if i borrow the picture for the z88dk website ?
For the record, I've just completed a better gaming device library which permitted me to improve the playability a bit more:
viewtopic.php?f=4&t=552&p=15372#p15372
..is it correct to consider both ZXpand and Chroma-81 having RAM space over the 16K limit ?
Do you mind if i borrow the picture for the z88dk website ?
For the record, I've just completed a better gaming device library which permitted me to improve the playability a bit more:
viewtopic.php?f=4&t=552&p=15372#p15372
..is it correct to consider both ZXpand and Chroma-81 having RAM space over the 16K limit ?
Re: Chroma 81 - SCART and Colour interface for the ZX81
Feel free to use it ..stefano wrote: Do you mind if i borrow the picture for the z88dk website ?
As I understood the documentation of Chroma81, that depends on the setting of the switch for ram @8K(!):..is it correct to consider both ZXpand and Chroma-81 having RAM space over the 16K limit ?
If ram at 8-16K is enabled, it is echoed to high ram ("8K RAM appears in memory map at $2000-$3FFF and echoed at $A000-$BFFF"), which then has priority over external ram behind Chroma, eg. in ZXPAND with ram at 32K-48K enabled. Thus using that memory may also affect the memory at 8K!
Siggi
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM
Re: Chroma 81 - SCART and Colour interface for the ZX81
I put the HRG page just above $8000, is it correct ?
Re: Chroma 81 - SCART and Colour interface for the ZX81
$8000 is OK, if ZXPAND is attached to Chroma81 (Chroma81 does not have ram there).
But if the ram at $2000-3FFF is not used for UDG or other things, I would use this ram, because Chroma81 itself has ram there, if the correspondig switch is set. Thus the program would also run without ZXPAND.
HTH Siggi
But if the ram at $2000-3FFF is not used for UDG or other things, I would use this ram, because Chroma81 itself has ram there, if the correspondig switch is set. Thus the program would also run without ZXPAND.
HTH Siggi
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM
Re: Chroma 81 - SCART and Colour interface for the ZX81
I think it is too small for a whole HRG page (6144 bytes).
I'll try to squeeze the code in the lower 16K, the actual code is just too big by few hundreds of bytes..
I'll try to squeeze the code in the lower 16K, the actual code is just too big by few hundreds of bytes..
Re: Chroma 81 - SCART and Colour interface for the ZX81
8Kbyte ram starting at $2000 should be large enough for a 6KB Hires file
Wilf Rigter also used this memory area for most of his HIRES-programs.
Siggi
Wilf Rigter also used this memory area for most of his HIRES-programs.
Siggi
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM
Re: Chroma 81 - SCART and Colour interface for the ZX81
Good, so..
I updated my "expanded submission". Same link as above, WRX at $2000, Chroma81 and Joystick enabled:
EDIT: file is attached here
Hope everything will work well.
I updated my "expanded submission". Same link as above, WRX at $2000, Chroma81 and Joystick enabled:
EDIT: file is attached here
Hope everything will work well.
- Attachments
-
- wall-expanded.p
- WALL.C - WRX + Chroma and ZXpand options
- (10.1 KiB) Downloaded 181 times
Re: Chroma 81 - SCART and Colour interface for the ZX81
Hi Stefano
meanwhile I found some problems when running the "Chroma-Wall" (where I made the picture): sometimes the screen jumps one line up or one line down or even gets shortly dark . But that occurs only at the LED-TV, which is connected via SCART/Croma, not on an old b/w TV, connected to the RF standard output of the ZX81!
The timing during HIRES seems to be a little bit different compared to LORES display, which seems to affect my LED TV (or Chroma?): it gets out of sync.
But this also occurs, when I run other HIRES software, like Wilf's HRDEMO30 (within the SHREB-package at http://www.pictureviewerpro.com/hosting/zx81/fredn.htm ). .
Does anyboly else notices the same effects using this programs with his Chroma81?
Siggi
meanwhile I found some problems when running the "Chroma-Wall" (where I made the picture): sometimes the screen jumps one line up or one line down or even gets shortly dark . But that occurs only at the LED-TV, which is connected via SCART/Croma, not on an old b/w TV, connected to the RF standard output of the ZX81!
The timing during HIRES seems to be a little bit different compared to LORES display, which seems to affect my LED TV (or Chroma?): it gets out of sync.
But this also occurs, when I run other HIRES software, like Wilf's HRDEMO30 (within the SHREB-package at http://www.pictureviewerpro.com/hosting/zx81/fredn.htm ). .
Does anyboly else notices the same effects using this programs with his Chroma81?
Siggi
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM
Re: Chroma 81 - SCART and Colour interface for the ZX81
Siggi, if you agree I can prepare a test program with a tune option similar to the one we used in the past, perhaps it is only a wrong vsync delay.