Search found 32 matches

by Forthretro.new.fr
Fri Mar 18, 2011 7:52 pm
Forum: Software
Topic: Toddy Forth - a new ZX81 forth implementation
Replies: 44
Views: 20337

Re: Toddy Forth - a new ZX81 forth implementation

Hello Kmura, (Hello Kelly)

Amazing !

Congrats.

BTW : Thanks a lot for giving to us the *.ASM source.

Dominique
by Forthretro.new.fr
Sun May 23, 2010 10:05 pm
Forum: Emulators
Topic: sz81 - a portable z81 based emulator using SDL
Replies: 19
Views: 23428

Re: sz81 - a portable z81 based emulator using SDL

Hi all, A new release is ready... But, is it possible to launch the Tree4th.rom (Forth bios rom @0000) with sZ81? We had to force the vertical refresh to 60hz ? The video display seem to hang on the default setup! Xav. Hello Xav, You told me, yesterday, you were looking for the Doc of Tree4th . but...
by Forthretro.new.fr
Thu Mar 04, 2010 11:27 am
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

IMHO it would be a better solution, to replace the PSEUDO-HRG routine, that you use, by a TRUE-HIRES routine (like WRX). That would then only require the easy "Wilf's 2 diodes" modification of the 16K ram pack and then your program would run on most other Zeddies. And you would also have the full g...
by Forthretro.new.fr
Thu Mar 04, 2010 11:20 am
Forum: Software
Topic: Programs which use Hi-Res Graphics on the Sinclair ZX81
Replies: 22
Views: 146742

Re: Programs which use Hi-Res Graphics on the Sinclair ZX81

Wow. I wasn't aware of that site. And to my surprise Google translate does a great job translating it! http://translate.googleusercontent.com/translate_c?hl=en&ie=UTF-8&sl=fr&tl=en&u=http://kweeky.over-blog.com/article-21943289.html&prev=_t&rurl=translate.google.com&twu=1&usg=ALkJrhg4NdA806r3Iq2hwT...
by Forthretro.new.fr
Wed Mar 03, 2010 10:22 pm
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

That is not so easy: see Wilf' Video tutorial http://www.user.dccnet.com/wrigter/index_files/ZX%20Video%20Tutorial.htm and a ZX81 schema. During lores or pseudo hires display the ULA overwrites during refresh (when the character generator is read) the Z80 address lines A0 to A8 (9 Bit: 0000..01FF, ...
by Forthretro.new.fr
Wed Mar 03, 2010 10:20 pm
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

"EO behaves different and IMHO allows to use any RAM as UDG-RAM!!! That is the reason, why my INTERC-U game (using UDG at $2000) runs in EO, but not on most real Zeddies (except my web-server zeddy :D ) Did you test using a real Zeddy or EO????" Hi Dominique Tried loading zx4paint on a real zeddy w...
by Forthretro.new.fr
Wed Mar 03, 2010 8:45 pm
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

My Hi-Res for ZX4PAINT is a mix of : - Pseudo HiRes OK. - HRG enabled ram. What is it used for? If it holds the new pattern for Pseudo Hires, it needs to be UDG-enabled ram (see below). and is very easy to understand. A) If we look at the routine and information given by Steven McDonald for his pse...
by Forthretro.new.fr
Wed Mar 03, 2010 1:17 pm
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

By the way, is there any difference in the requirements for WRX (Wilf's) Hi-Res graphics and those from Matthias? In other words can a program written for WRX (such as ZX4PAINT) work with Matthias's drivers, or do you have to load the WRX drivers? Rich, honestly, I don't know. May be Siggi can answ...
by Forthretro.new.fr
Tue Mar 02, 2010 7:30 pm
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

.... No, not solved: as written before: you know only, that there is ANY ram at 8K. But it can be "normal" ram, not usable for UDG or HRG. Yes solved ! I never asked it and don't need this 8k to be "usable for UDG or HRG". Since I said that i need address 8192 and the test says I have the address 8...
by Forthretro.new.fr
Tue Mar 02, 2010 11:41 am
Forum: Software
Topic: Detecting HRG
Replies: 20
Views: 34185

Re: Detecting HRG

Siggi, Thanks, but the question asked by Rich, as I could understand, was from the PROGRAMMER point of view. The purpose, clearly, is to ask the programmer to include (if possible) a Low Res and a HGR version of the same programm. The programm detect if the required configuration is avaible and, acc...