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#sinclair

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Continued thread

anyway here's a patched z88dk that cleans up the ZX81 tape output, whoever wrote it clearly wasn't a DSP signals person 😬

github.com/SegHaxx/z88dk

makes it all nice and symmetrical, no more DC offset

i'll make it nice sine waves someday

...i was unable to write readable tapes and after driving the SO nuts listening to screeching i determined the super clean outputs on a modern PC cause the vintage cassette recorders aggressive AGC to max out, resulting in mangling the signal when it comes in

the ZX81 has zero error correction and this fails the load

after adding a pilot tone inspired by the Apple II i can write tapes that load 100% reliably and it gives you something to orient on when scrubbing through a tape looking for the start of a file

it also shows as a solid white screen on the ZX81

near as i can tell a real ZX81 is so goddamn RF noisy the video buzz fulfills the same purpose of priming the recorder's AGC

80's tech, man ¯\_(ツ)_/¯

...with that i'm kinda burned out on the ZX81 lol

#retrocomputing
#sinclair #ZX81

The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries. - SegHaxx/z88dk
GitHubGitHub - SegHaxx/z88dk: The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries.The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries. - SegHaxx/z88dk
Continued thread

using the incredible compatibility afforded by the front panel headphone jack, i can write a tape from a modern PC and load it into the ZX81

and i run headfirst in to z88dk's limitations, compiling with sccz80 renders in a lethargic 5.4 minutes, sdcc is much faster at 2.5 minutes

but sdcc doesn't seem to support the ZX81 compatible floating point library, so it glitches the video

the inner loop is 16bit fixed point but using it all the way through gets real raunchy precision wise so i thought i'd just use floating point on the outside hahahah

youtube.com/watch?v=XxWg5hIT2f

#retrocomputing
#sinclair #ZX81

Are you a fan of the Sinclair ZX Spectrum?

There are lots of PeerTube videos about the Spectrum (and other Sinclair machines) on this playlist:

:zxspectrum: fedi.video/w/p/fKcNNx7EdTxa4pc

- On a phone: Swipe up first two videos at bottom to browse rest of playlist

- On a computer: Choose video by scrolling through playlist on right of screen

- If you're watching embedded: Click ⏭️ or ⏮️ to see next or previous videos in playlist

cc @zxspectrum

Continued thread

The last thing I photographed before leaving the Flea this past Sunday was a Timex #Sinclair 1000, in its original box. I have an acquaintance who had a ZX81 (of which this is a variant) long ago, and we sometimes talk about our respective old computers and what we got up to as children.

Recién tecleado "Shop-List". Programa en BASIC para Sinclair ZX Spectrum 16/48K con el que realizar compras domésticas, publicado en la revista británica Sinclair Programs, número Marzo-Abril de 1983.

Para su buen funcionamiento, se necesitar tener la ZX-Printer (presente en algunos emuladores de Spectrum) para imprimir la lista de la compra.

Al archivo de Spectrum Computing que va.

#ZXSpectrum #Preservación #ListadosBASIC #revistas #Sinclair

Su ficha: spectrumcomputing.co.uk/entry/

Remakes del clásico arcade "Scramble" de Konami, versiones modernas lanzadas recientemente para consolas Atari y sistemas de 8 y 16 bits, reunidos en este video.

#Arcade #Remakes #Videojuegos #Atari #Amiga #Amstrad #Commodore #Sinclair

Scramble - New home Ports - Amiga,Amstrad CPC,Atari 2600,7800,Commodore 64,Spectrum

youtu.be/KUR8ikbhaBc?si=W4PkbN

youtu.be- YouTubeEnjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.