Search found 41 matches

by zx-heinz
Sun Nov 05, 2023 5:45 pm
Forum: GAMES
Topic: New ZX81 Games
Replies: 363
Views: 682421

Re: New ZX81 Games

GOL doesn't run, neither on an ZX81NU nor on the EO. :(
by zx-heinz
Sun Jul 30, 2023 7:41 pm
Forum: Hardware
Topic: ZX81 with vertical hold issues?
Replies: 30
Views: 3219

Re: ZX81 with vertical hold issues?

Did you try to adjust the vertical frequency by the potentiometer at the backside of the TV?
by zx-heinz
Sat Dec 10, 2022 4:27 pm
Forum: Hardware
Topic: ¿A Jupiter Ace clone kickstarter?
Replies: 6
Views: 3151

Re: ¿A Jupiter Ace clone kickstarter?

@wilco2009: Is it possible, to get a copy of the test rom?
by zx-heinz
Mon May 30, 2022 7:27 pm
Forum: Hardware
Topic: Would it be possible to run H4th on a ZX80?
Replies: 11
Views: 2134

Re: Would it be possible to run H4th on a ZX80?

Here is the echo printer command (taken from Husband's manual):
by zx-heinz
Mon Jan 03, 2022 6:51 pm
Forum: Hardware
Topic: Harlequin 48K Rev. G - First Time Power Up
Replies: 19
Views: 5119

Re: Harlequin 48K Rev. G - First Time Power Up

If you can't burn a 27C128 and want to use an EEPROM instead of this, I would like to recommend the W27C512 wich is pin compatible with the 27C512 or 27C256, 27C128.
by zx-heinz
Sat Sep 25, 2021 12:09 pm
Forum: Spectrum BASIC
Topic: Bitwise AND
Replies: 2
Views: 7047

Re: Bitwise AND

Hi, I am trying to convert a 16 bit integer to two 8bit numbers. I tried : LET vh=65280 AND value : LET vl=255 AND value I am getting it wrong I think. I checked the ZX BASIC manual and seems like AND is not for this purpose. vh is giving me 2 when I use 2 as the value variable. How do I do this ? ...
by zx-heinz
Mon Sep 13, 2021 4:43 pm
Forum: Hardware
Topic: UM1082 modulator scheme
Replies: 0
Views: 1276

UM1082 modulator scheme

Does somebody have the scheme of the UM 1082 modulator? This modulator is used in the ZX81 USA.
by zx-heinz
Mon Sep 13, 2021 1:15 pm
Forum: WANTED
Topic: UM1082 modulator
Replies: 2
Views: 19955

Re: UM1082 modulator

Does somebody have the scheme of this modulator?
by zx-heinz
Wed Sep 08, 2021 11:27 pm
Forum: Hardware
Topic: What do I use for a screen for my zx spectrum
Replies: 3
Views: 1873

Re: What do I use for a screen for my zx spectrum

1024MAK wrote: Wed Sep 08, 2021 1:59 pm to convert the existing RF/UHF/aerial output and make it a composite video output instead.
..or even simultaneously.
by zx-heinz
Tue Aug 24, 2021 11:33 am
Forum: Hardware
Topic: Printer heads misalignment?
Replies: 8
Views: 1982

Re: Printer heads misalignment?

@moggy: Is there a horizontal moving heat head or is there just a line of 256 heat "hooks" (one for each pixel)? Could you show a more detailed picture around the printing unit? The first picture in https://sinclairzxworld.com/viewtopic.php?p=43887#p43887 seems to prove that there are even two movin...