Die Suche ergab 49 Treffer

von andyrea
05.09.2018, 22:56
Forum: Sinclair ZX81
Thema: ZXpand+ Pre order on SMR
Antworten: 4
Zugriffe: 276

ZXpand+ Pre order on SMR

Charlie Robson is to build 100 more ZXpand+ on a pre order basis.

Full details at SMR https://www.sellmyretro.com/offer/detai ... rder-32627

Regards Andy
von andyrea
08.07.2018, 00:47
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

The Big Build has started, most of these are destined for you guys. Thank you all for your support.

Bild

regards Andy
von andyrea
26.06.2018, 22:46
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

I had time this evening to do a little experiment. with the addition of a single 1K resistor across the tv type link pins My ULA can drive the modulator in an acceptable way. scope showing back porch https://preview.ibb.co/bHUzx8/IMG_20180626_182013.jpg This is RF :shock: on a colour 14inch CRT http...
von andyrea
26.06.2018, 13:56
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

don't waste your time on the inverse pict option, it is really not as important! (To me this option would be great. And very cool to be software selectable.) Hi Martin, it is very experimental I need to test with much software to make sure that it will not be falsely triggered. However since as all...
von andyrea
26.06.2018, 13:51
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

Thank you Heinz for the further information. having looked at some of the schematics for Pokemon's CCP / CCB boards I believe that the boards that have potentiometers to adjust the sync and pixel sensitivity can work with this ULA, with the addition of a single resistor to the ULA across the tvtype ...
von andyrea
26.06.2018, 00:27
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

Hello Heinz, Does ZX81CPP offer any other benefits besides clear picture and possibility to invert video ? I think i have a way to offer inverted video switchable by means of a 9 byte machine code program in conjunction with some extra logic inside the CPLD. The idea is to have consecutive reads fro...
von andyrea
25.06.2018, 19:50
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

Hello Andy, the new ULA replacement is very nice. Thank you for this development for a good price! There was the question, if the ULA will work together with pokemons ZX81CCP-modul. One of the advantages of this vid-board consists in the possibility to switch over the display from w/b to black/whit...
von andyrea
24.06.2018, 21:53
Forum: Sinclair ZX81
Thema: Geschlossen: Sammelbestellung: Neue ULA im CPLD von Andy Rea
Antworten: 42
Zugriffe: 3568

Re: Sammelbestellung: Neue ULA im CPLD von Andy Rea

Sorry for my English i am not good at German :mrgreen: however a little more information for you. he video output is 1V p-p intended to drive directly into a 75ohm composite input, so no transistor buffer or pokemon *ccp is required just take the video signal direct to the antenna socket. if you hap...
von andyrea
10.04.2018, 19:38
Forum: Sinclair ZX81
Thema: UDG4ZXpand Thread
Antworten: 8
Zugriffe: 1072

Re: UDG4ZXpand Thread

great stuff, glad it's all working good now. I shall incorporate the changes into future builds. For everyone else, the changes that were made are resistor in clock circuit from 0ohm to 330ohm forming a classic RC low-pass filter ( maybe i should have done this in the first, my bad :oops: ) and seco...
von andyrea
03.04.2018, 21:11
Forum: Sinclair ZX81
Thema: UDG4ZXpand Thread
Antworten: 8
Zugriffe: 1072

Re: UDG4ZXpand Thread

I have today worked on relentlesly Schombi's problem and the only ay i could reliably duplicate the problem as to deliberately mess with the clock signal at the edge connector. it seems that the Xilinx chip is more susceptible to a noisy clock that traditional 5v logic. If anybody else has such prob...
von andyrea
03.05.2013, 17:00
Forum: Sinclair ZX81
Thema: another demo
Antworten: 12
Zugriffe: 4147

Re: another demo

when you start Eightyone you need to go to options / hardware, then on the lower interfaces tab make sure ZON-X is selected for soundcard.... you should also make sure you are using the fixed ( well better but not 100% ) version of eightyone that sirmorris fixed up.

Regards Andy
von andyrea
02.05.2013, 19:15
Forum: Sinclair ZX81
Thema: another demo
Antworten: 12
Zugriffe: 4147

Re: another demo

oops.. forgot to mention that :oops:

Thanks Thomas
von andyrea
29.04.2013, 19:45
Forum: Sinclair ZX81
Thema: another demo
Antworten: 12
Zugriffe: 4147

another demo

As some of you ( well those that went to Mahlerts this year ) you may of seen my latest demo for 16K ZX81 with Zon-X it is a tribute to Bob Smith Who In my humble opinion has since the era of 3d monster maze written the best games for our humble machines. Game graphics by Bob Smith, Music by Yerzmye...
von andyrea
22.04.2013, 22:25
Forum: Sinclair ZX81
Thema: 17. ZX-TEAM-Treffen 19. bis 21. April 2013
Antworten: 110
Zugriffe: 25985

Re: 17. ZX-TEAM-Treffen 19. bis 21. April 2013

Hello all, I would also like to thank everyone that attended, without so many people the ZX-Team meet would not be as fantastic as it is. Many thanks to Peter for organizing everything, Many thanks to everyone who helped keep the kitchen running smoothly and supplied us with some excellent food. Als...
von andyrea
18.08.2012, 21:31
Forum: Sinclair ZX81
Thema: Hi-res not working correctly.
Antworten: 1
Zugriffe: 1140

Hi-res not working correctly.

Hi everyone,

A plea for some German wisdom if you'd be so kind, Over at Rwap forum This thread.

Proteus has installed internal 32K ram modification, but has since removed the 7400 and made it 16K but still Hi-res does not work correctly.

Any idea's ?

Thanks in advance Andy
von andyrea
28.06.2012, 23:34
Forum: Sinclair ZX81
Thema: Wer hat ein SYS-Info-Programm für den ZX81?
Antworten: 11
Zugriffe: 4678

Re: Wer hat ein SYS-Info-Programm für den ZX81?

Hi this is an interesting thread, for testing if 'andy ula' is present you should first PEEK 101, if the result is odd then a reset ( or power cycle if reset on ula is not connected) should be performed, again PEEK 101, if result is zero then hi-probabilty that 'andy ula' is present, you can now POK...
von andyrea
29.04.2012, 13:57
Forum: Sinclair ZX81
Thema: 6-Channel Sound on the ZX81
Antworten: 39
Zugriffe: 12867

Re: 6-Channel Sound on the ZX81

Preliminary TS player for ZX81. see thread here http://www.rwapservices.co.uk/ZX80_ZX81/forums/viewtopic.php?f=6&t=834&start=10 You'll have to do a few pokes to suit your AY chips port addresses. The Display when playing is a minimal 8 line affiar, ( the top 8 lines of normal D-file) but moved towar...
von andyrea
13.04.2012, 00:22
Forum: Sinclair ZX81
Thema: 6-Channel Sound on the ZX81
Antworten: 39
Zugriffe: 12867

Re: 6-Channel Sound on the ZX81

Wow,Good work Sascha tracking down all those port addresses... now if i'm not mistaken the original Zon-X addresses occured becuase of faulty / incomplete address decoding and then different softwares used either/or of the available addresses 0f/1f or cf/df or of/df or cf/1f.... you only need 2 addr...
von andyrea
12.04.2012, 00:31
Forum: Sinclair ZX81
Thema: Oh noes... not another demo...
Antworten: 15
Zugriffe: 4521

Re: Oh noes... not another demo...

Following on in the text mode only another little program as a proof of concept.

The block graphic on the left is just some not very random crap based on the rom contents, it's purely there as a contrast to the vertical text scroll...

Enjoy Andy
VSPROOF.P
Text mode only vertical Smooth scroller.
(12.88 KiB) 121-mal heruntergeladen
von andyrea
11.04.2012, 18:31
Forum: Sinclair ZX81
Thema: 6-Channel Sound on the ZX81
Antworten: 39
Zugriffe: 12867

Re: 6-Channel Sound on the ZX81

Yes i got them, they look like PT3's i'll have a go at knocking up a player at some point, but it will either be fast mode only, or minimal display probably just a few lines of text. if the display is reduce to say 5 lines of text that should give approx 2.5X the number of clock cycles available tha...
von andyrea
09.04.2012, 14:36
Forum: Sinclair ZX81
Thema: Oh noes... not another demo...
Antworten: 15
Zugriffe: 4521

Re: Oh noes... not another demo...

Cheers YerzMyey, have bunged your audio track on the video, and changed the link in the above posting....

Good job i have real hardware to enjoy it one... youtube sucks :D Or maybe it's just my video skills ( or lack there of :mrgreen: )

Andy
von andyrea
09.04.2012, 13:22
Forum: Sinclair ZX81
Thema: Oh noes... not another demo...
Antworten: 15
Zugriffe: 4521

Re: Oh noes... not another demo...

Ah... that will be my Erm crappo skill at making a stereo to mono adapter lead.... :oops:

I'll do another when i get chance

Andy
von andyrea
08.04.2012, 23:04
Forum: Sinclair ZX81
Thema: Oh noes... not another demo...
Antworten: 15
Zugriffe: 4521

Re: Oh noes... not another demo...

http://www.youtube.com/watch?v=iYoZxVTWJMU

it's a bit poor quality, my video capture card doesn't like the Zeddy, so this is recorded on my camera, but the audio is direct.

Andy

P.s it works in the AY-fixed version of EightyOne as patched by Sirmorris
von andyrea
08.04.2012, 19:44
Forum: Sinclair ZX81
Thema: Oh noes... not another demo...
Antworten: 15
Zugriffe: 4521

Re: Oh noes... not another demo...

Thanks Bodo,

Yes there is some trickery with the Vsync, precise timing is of course necessary or else servere display disruption occurs,

I also used one of your very fine idea's : the stack :D

regards Andy
von andyrea
07.04.2012, 23:57
Forum: Sinclair ZX81
Thema: Oh noes... not another demo...
Antworten: 15
Zugriffe: 4521

Oh noes... not another demo...

Hi all It's finished, a TEXT only demo, so will work on non hi-res machines requires 16K, sound card optional ;) MS.P Just load her up and.... erm enjpy. Soundtrack is the work of Yerzmyey, all coding by me, and some idea's provided by Sirmorris over a beer on a dark night somewhere near Dunkirk :mr...