ZX-Uno

Hi,

my ZX-Uno seems to have a problem

It worked properly for weeks, I made no update, only put it away for some month.

Yesterday I wanted to play a little around with it but the screen was black on bootup.
Then I tried composite with no success. But when I connect a joystick to it, press the button and up on startup, I get a Screen that tells me "ZX-UNO Spectrum core is loaded. Now trying to boot from BIOS..." and "You shouldn't see this screen for more than half a second".

That's all, nothing more happens. What can I do?

Thanx for help.

Puedes seguir esta receta para volver a instalar la BIOS y solucionar el problema:

http://desubikado.sytes.net/zx-uno-faq- ... o/#unbrick

retroMonger escribió: ↑

18 Ago 2020, 01:19

Now trying to boot from BIOS..." and "You shouldn't see this screen for more than half a second".

I saw this message, long time ago. If I remember correctly, when my RAM IC was faulty. So i replaced the SRAM integrated circuit. But anyway you can try to restore flash firmware first.

zigfreid escribió: ↑

20 Ago 2020, 10:59

retroMonger escribió: ↑

18 Ago 2020, 01:19

Now trying to boot from BIOS..." and "You shouldn't see this screen for more than half a second".

I saw this message, long time ago. If I remember correctly, when my RAM IC was faulty. So i replaced the SRAM integrated circuit. But anyway you can try to restore flash firmware first.

Yo también obtuve ese mensaje cuando tenía un core EXP26 específico para memoria externa de 2MB, y le quité el addon de memoria externa. Así que si no es un problema de la BIOS, es posible, como bien dices, que se trate de un problema de la memoria SRAM.

Recientemente he sintetizado dos cores de testeo para el modulo externo de 2Mb (el de sram sólo comprueba los primeros 512Kb), con el objetivo de comprobar el zócalo de expansión de un ZXGo+ que me he montado, ya que la SRAM usa muchos de esos pines. Pueden venirte bien para comprobar tu memoria externa de 2Mb, los adjunto en este post.

spark2k06 escribió: ↑

20 Ago 2020, 13:09

Recientemente he sintetizado dos cores de testeo para el modulo externo de 2Mb (el de sram sólo comprueba los primeros 512Kb), con el objetivo de comprobar el zócalo de expansión de un ZXGo+ que me he montado, ya que la SRAM usa muchos de esos pines. Pueden venirte bien para comprobar tu memoria externa de 2Mb, los adjunto en este post.

Gracias por el aporte. Realmente yo no tenía el módulo de memoria externa dañado. Volví a ponerlo y el ZX-Uno arrancó bien. Puse un core de Spectrum como principal que usaba solo memoria interna y ya arrancó bien. Luego ya pude quitar el módulo de memoria externa sin que tuviese problemas con el arranque. Ahora lo tengo puesto de nuevo, y el core de Spectrum que usa 2MB externos lo tengo como core secundario.

After my initial post...
...I could load the Firmware from PC to ZX-Uno with the ear connector, Winamp and TAP-Plugin.
The ZX-Uno lived again and I was very happy. I tried ZX-Spectrum and C64 cores with no problems.
...but than I put off the power connector, connected it again and saw the testimage again. This time I had not to press up and button on joystick during startup of the ZX-Uno.
And now the ZX-Uno doesn't load anything via ear connector. It has a brown border and no reaction. Only the ScrollLock Key works correct.
I have an USB-Blaster (ordered together with the ZX-Uno) but the USB-Blaster has 2 x 6 pins and I read about 2 x 5 pins in the ZX-Uno manual.
The second problem is, that I can't install the driver for the USB-Blaster on Windows 10 (and also on Windows 2000).
I'm more a programmer than a cable and chip solderer. I have two left hands for such work.
It's a pity that such niche peace of hardware seems to be broken after that short using time.
I now bought a ZXDOS+, perhaps I'm more lucky with it.
Thanx to all for trying to help me.