Search found 2404 matches

by 1024MAK
Fri Aug 16, 2019 5:55 pm
Forum: SALES
Topic: ZX81 ULA
Replies: 75
Views: 18433

Re: ZX81 ULA

The “standard” that has developed is for composite video (also known as baseband video) to be fed via co-ax cables that have a characteristic impedance of about 75Ω, hence most have an input resistance of 75Ω (as when dealing with video frequencies, every part of a circuit should have the same imped...
by 1024MAK
Fri Aug 16, 2019 5:46 pm
Forum: SALES
Topic: Lardo buys another zeddy
Replies: 5
Views: 86

Re: Lardo buys another zeddy

Lardo Boffin wrote:
Fri Aug 16, 2019 4:46 pm
1024MAK wrote:
Fri Aug 16, 2019 4:12 pm

I’m thinking of using ZPPM for this thread (no, NOT pages per minute, but rather Zeddy posts per minute)!

Mark
Zeddy Purchases Per Minute?
Oh my! :lol:
by 1024MAK
Fri Aug 16, 2019 4:19 pm
Forum: Software
Topic: Memotext & word processing in general
Replies: 76
Views: 13875

Re: Memotext & word processing in general

👍 8-)

Mark
by 1024MAK
Fri Aug 16, 2019 4:12 pm
Forum: SALES
Topic: Lardo buys another zeddy
Replies: 5
Views: 86

Re: Lardo buys another zeddy

With all due respect, starting the count now, is like starting to count humans in each country on the Earth after you have already been to China! :shock: :lol:

I’m thinking of using ZPPM for this thread (no, NOT pages per minute, but rather Zeddy posts per minute)!

Mark
by 1024MAK
Fri Aug 16, 2019 4:03 pm
Forum: SALES
Topic: ZX81 ULA
Replies: 75
Views: 18433

Re: ZX81 ULA

As long as you don’t connect a high voltage, it’s very unlikely that you will damage a monitor with a 50Hz or 60Hz vertical frequency and a 15625Hz horizontal frequency video signal or with a 5V logic signal from a logic chip. All decent monitors/VDUs/televisions have some protection components fitt...
by 1024MAK
Thu Aug 15, 2019 9:14 pm
Forum: SALES
Topic: I missed the hot cakes...
Replies: 25
Views: 342

Re: I missed the hot cakes...

Lardo Boffin wrote:
Thu Aug 15, 2019 3:42 pm
Thanks for the RAM heads-up Charlie.

I’m looking at the video output section. Does this have a native composite video output like Andy’s? Just not sure of the terminology. :D
Reading the documentation, it appears the answer is Yes, it can do this if SW1 is off.

Mark
by 1024MAK
Thu Aug 15, 2019 9:00 pm
Forum: SALES
Topic: I missed the hot cakes...
Replies: 25
Views: 342

Re: I missed the hot cakes...

I prefer my internal RAM upgrade detailed here :D Hello Bloodnok, welcome :D I must admit, I could not resist buying one of your vLA81 Sinclair ZX81 ULA replacements. When it arrives (and I can find some time) I’ll try hooking it up to the Zeddy that I used in the article on the site I linked to abo...
by 1024MAK
Mon Aug 12, 2019 3:21 pm
Forum: Software
Topic: Memotext & word processing in general
Replies: 76
Views: 13875

Re: Memotext & word processing in general

👍 Where’s the like button when you need it... :mrgreen:

Mark
by 1024MAK
Sun Aug 11, 2019 10:28 pm
Forum: Software
Topic: Memotext & word processing in general
Replies: 76
Views: 13875

Re: Memotext & word processing in general

XavSnap wrote:
Sun Aug 11, 2019 9:41 pm
Looking at the board, I’m guessing that the 34 Way pin header is a parallel (Centronics like) port.
Yes, but the OCTAL TRANSPARENT LATCH WITH 3-STATE OUTPUTS… is made to send datas to printer, not retrieve datas !
That’s what I meant :lol:

Mark
by 1024MAK
Sun Aug 11, 2019 10:24 pm
Forum: Development
Topic: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)
Replies: 29
Views: 1771

Re: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)

I am working on the VGA modes and I was wondering what everyone thought would be good modes to have for games and such. I have about 16K for video memory and maybe another 2-4K for palette info. So with that in mind here is what I came up with. Text: 80x25 (not sure about what is possible for colou...