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Re: UDG 4 ZXpand / ZXblast
Posted: Fri Aug 25, 2017 2:22 pm
by Andy Rea
i have started a new discussion about using the UDG board
viewtopic.php?f=7&t=2533
regards Andy
Re: UDG 4 ZXpand / ZXblast
Posted: Fri Aug 25, 2017 3:00 pm
by Moggy
siggi wrote: ↑Fri Aug 25, 2017 12:57 pm
Moggy wrote: ↑Fri Aug 25, 2017 11:35 am
QUOTE.
"Changing the i register takes only 5 bytes so can be poked into a line 1 rem statement so charsets can be used easily from basic also."
This is the bit that leaves me stumped.
I have created some UDG's but don't know how to display them using basic any chance of a simple example, say a line of "X"'s being turned into a UDG of my choice?
The 5 bytes in M/C are necessary to change the I register to point to another UDG-character set in RAM. You could use standard POKE command to store the UDG pattern there by BASIC.
I have done that also in my UDG game:
viewtopic.php?f=6&t=526&p=4987&hilit=Interc+u#p4987
Regards
Siggi
Thanks Siggi much appreciated.
Re: UDG 4 ZXpand / ZXblast
Posted: Sat Aug 26, 2017 5:35 pm
by 1024MAK
Mine arrived today
- IMG_5200.JPG
- UDG 4 ZXpand and some 3.5mm mono jack plugs and sockets
- (255.52 KiB) Downloaded 538 times
(Along with a few other bits from eBay)
Thank you Andy
Mark
Re: UDG 4 ZXpand / ZXblast and any other ZX81
Posted: Wed Aug 30, 2017 4:28 pm
by siggi
Some years ago I also thought about an extension to have UDG on any Zeddy: a 8KByte static ram on a small board inside the ZX81 (within the ROM socket, carrying the RAM and ROM). Nowadays I would use single gates instead of a GAL:
http://forum.tlienhard.com/phpBB3/viewt ... 3857#p3857
Maybe that would also be useful nowadays ...
Siggi
Re: UDG 4 ZXpand / ZXblast
Posted: Wed Aug 30, 2017 4:31 pm
by Andy Rea
ah yes, the internal mod is a little easier.
regards Andy
Re: UDG 4 ZXpand / ZXblast
Posted: Wed Aug 30, 2017 5:00 pm
by Moggy
Andy Rea wrote: ↑Wed Aug 30, 2017 4:31 pm
ah yes, the internal mod is a little easier.
regards Andy
But the green board looks nicer.
Re: UDG 4 ZXpand / ZXblast
Posted: Wed Aug 30, 2017 6:20 pm
by siggi
My 2 boards arrived this day
Thanks a lot
Siggi
Re: UDG 4 ZXpand / ZXblast
Posted: Wed Aug 30, 2017 10:23 pm
by hsimpson
My UDG board arrived this day, too
.
Thank You very much.
Re: UDG 4 ZXpand / ZXblast
Posted: Thu Aug 31, 2017 8:26 am
by nollkolltroll
Board received Monday, and I had time to try it out. All works as expected with the ZXpand
Will try it with a classic memory expander some time...
Re: UDG 4 ZXpand / ZXblast
Posted: Thu Aug 31, 2017 8:43 am
by Andy Rea
Hi Adam, goid to hear it arrived safely. By classic memory expander you mean the Sinclair 16k ram pack?
Regards Andy