Search found 278 matches

by McKlaud
Sat Mar 10, 2018 6:34 pm
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 62761

Re: ZX81 ULA-in-a-CPLD

Mark,

Andy is miles ahead of me. :mrgreen: :mrgreen: His ULA is working perfectly fine :geek: My version is nearly there.
by McKlaud
Sat Mar 10, 2018 1:06 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 62761

Re: ZX81 ULA-in-a-CPLD

First "K" seen on the screen, but some issues with stability and timings.
by McKlaud
Sat Mar 10, 2018 12:55 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 62761

Re: ZX81 ULA-in-a-CPLD

In my case the CPLD is not even warm. The hottest part in my testing board is the ROM chip now. The power consumption is roughly 250mA, but I have also got a 16KB SRAM chip on this board. I think I could go even lower if the 7805 were replaced with any decent DC-DC converter.
by McKlaud
Sat Mar 10, 2018 12:22 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 62761

Re: ZX81 ULA-in-a-CPLD

Andy Rea wrote:
Sat Mar 10, 2018 12:13 am
McKlaud wrote:
Fri Mar 09, 2018 11:54 pm
Andy, I am glad reading your post. :) You are Master Yoda of ZX81 ULA, I am just newbie in this world. BTW Could you correct pictures, I can't see them.
see if it images show now

regards
Thanks a lot, now they are perfectly visible :)
by McKlaud
Fri Mar 09, 2018 11:54 pm
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 62761

Re: ZX81 ULA-in-a-CPLD

Andy, I am glad reading your post. :) You are Master Yoda of ZX81 ULA, I am just newbie in this world. BTW Could you correct pictures, I can't see them.
by McKlaud
Fri Mar 09, 2018 6:16 pm
Forum: Sinclair Misc
Topic: ZX-Team Meeting at Mahlerts and Web-Cam
Replies: 7
Views: 2102

Re: ZX-Team Meeting at Mahlerts and Web-Cam

Siggi: thanks for letting us know.

Is any meeting programme anywhere available?
by McKlaud
Fri Mar 09, 2018 1:46 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 62761

Re: ZX81 ULA-in-a-CPLD

Hi,

Still work in progress with porting the RetroTechie's implementation into XC9572XL, but small success achieved. The ULA mini board inside a real ZX81 hardware, the clock signals read from pin 6 of the CPU and the composite video output with a 75 Ohm load.
by McKlaud
Mon Mar 05, 2018 11:15 pm
Forum: Emulators
Topic: Clock Signal: back again for the Mac and UNIX-ishes
Replies: 14
Views: 6184

Re: Clock Signal: back again for the Mac and UNIX-ishes

As OS X user I am glad that this emulator exists :) Nice work.
by McKlaud
Fri Mar 02, 2018 4:40 pm
Forum: Hardware
Topic: WANTED SPECTRUM NTSC ULA
Replies: 9
Views: 2659

Re: WANTED SPECTRUM NTSC ULA

TS2068 is NTSC machine as a default and 14.112Mhz & 3.579MHz crystals are in it. The kit on SMR is for an ordinary Speccy, which was designed to be used on this side of the pond, so with any PAL TV set. If you want to convert the PAL Speccy into NTSC one, yes, you need NTSC ULA and suitable crystals.