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Author Topic: EPROM/Flash ROM/SRAM expansions (Read 27482 times)

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #15 on: 2014.February.02. 13:16:53 »
And about the SRAM. which is the better?

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #16 on: 2014.February.02. 13:36:25 »
Another doubt, the first burn of the EPROM has to be made ​​on one of the SRAM sockets changing the WE pin, with the older EPROM  still installed, because at first the 29X040 is empty and we haven't yet ExDOS in it, no?


Seems like a vicious circle...


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Otra duda, la primera programación de la EPROM ha de ser realizada en uno de los zócalos de las SRAM cambiando el pin WE, con la vieja EPROM aun instalada, porque al principio la 29X040 está vacía y aun no tenemos EXDOS en ella, no?


Parece un circulo vicioso...

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #17 on: 2014.February.02. 13:39:34 »
I think the best is that you pre-programe it ...

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #18 on: 2014.February.02. 14:10:02 »
Quote from: gflorez
And about the SRAM. which is the better?
Type not important, just we need a DIP32 package, these what I found in DIP:
Alliance Semiconductorts AS6C4008
Samsung K6X4008C, KM684000
Hitachi HM628512

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #19 on: 2014.February.02. 14:20:34 »
Quote from: gflorez
Another doubt, the first burn of the EPROM has to be made ​​on one of the SRAM sockets changing the WE pin, with the older EPROM  still installed, because at first the 29X040 is empty and we haven't yet ExDOS in it, no?
Yes this is a problem. But possible load from TAPE :-)
Better idea put your old EXDOS EPROM temporary to the cartridge.

Quote from: gflorez
I think the best is that you pre-programe it ...
Yes this is the most easy way :-)

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #20 on: 2014.February.03. 00:38:24 »
The only old EXDOS EPROM I have is of 128k, and to put it on a cartridge I need another more lesson, as that bay lacks a memory direction line(if I`ve understood you correctly).

May be inserting EXDOS as an extension by tape can do the trick... I  have plenty of RAM.

How can I extract the content and do an EXDOS EXOS extension?

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #21 on: 2014.February.03. 06:46:18 »
Quote from: gflorez
The only old EXDOS EPROM I have is of 128k, and to put it on a cartridge I need another more lesson, as that bay lacks a memory direction line(if I`ve understood you correctly).
Yes. Just connect the IC Pin 2 to GND. Then the IC A16 will be 0, its means the lower half will be available, where the EXDOS in the EPROM.
And connect Pin 32 to Pin 30 for getting a +5V, as I wrote before as "VCC trick at 27C010"
« Last Edit: 2014.February.03. 12:11:53 by szipucsu »

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #22 on: 2014.February.03. 12:30:11 »
A local electronics store here in Madrid have the chips:

Each AS6C4008 costs 3,99 Euro, and the AM29F040 2,66 Euro.

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #23 on: 2014.February.03. 12:50:12 »
Quote from: gflorez
Each AS6C4008 costs 3,99 Euro, and the AM29F040 2,66 Euro.
I think they are reasonable prices.
Last time I got SRAM from tme.eu, it had similar price.
« Last Edit: 2014.February.03. 14:30:18 by szipucsu »

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #24 on: 2014.February.03. 15:10:28 »
I am able to do those welds, but the process of programming is what intimidates me.

To do the things more rapid (and probably safer...), how about if I send you the EPROM and you fill it of whatever you think necessary....?

In the meanwhile I can adapt the EXDOS card sockets.

Then, once with the EPROM returned, I'll only have to switch chips.

And that way the EP may be operative while waiting.

------------------

Yo soy capaz de hacer esas soldaduras, pero lo que me intimida es el proceso de programación.

Para hacer las cosas mas rápidas (y probablemente mas seguras...), ¿qué tal si te envío la EPROM y tú la llenas de lo que te parezca necesario...?

Mientras tanto yo puedo ir adaptando los zócalos de la tarjeta EXDOS.

Entonces, una vez la EPROM de vuelta, solo tendré que intercambiar los chips.

Y de ese modo el EP seguirá operativo durante la espera.
« Last Edit: 2014.February.03. 15:27:23 by gflorez »

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #25 on: 2014.February.03. 15:58:10 »
Also remember my EP is untouched inside. You put EXOS 2.31, BASIC, ESP, CYRUS and WP 2.6 on a cartridge (64k).

On the EXDOS EPROM you put EXDOS, ISDOS, LISP, FORTH, ASMON, VAR, and EPDOS.

I think it is reasonable to move all these roms from the cartridge into the new 512k EPROM, and free the cartridge bay for other projects.


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También recuerda que mi EP está sin tocar por dentro. Tú pusiste EXOS 2.31, BASIC, ESP, CYRUS y WP 2.6 en un cartucho (64k).

En la EPROM del EXDOS pusiste EXDOS, ISDOS, LISP, FORTH, ASMON, VAR, y EPDOS.

Pienso que es razonable mover todas esas roms del cartucho a la nueva EPROM de 512k, y dejar el puerto de los cartuchos para otros proyectos.

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #26 on: 2014.February.03. 17:06:43 »
Quote from: gflorez
To do the things more rapid (and probably safer...),

The fastest way the "current EPROM to the cartride" and flash the new ROM.

Quote
how about if I send you the EPROM and you fill it of whatever you think necessary....?
Yes it is possible, but I think better if you buy the IC from me, then no two shipping cost just one!

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #27 on: 2014.February.03. 17:09:01 »
Quote from: gflorez
Also remember my EP is untouched inside. You put EXOS 2.31,
Just the memory test part.
Do you not want to install latest version inside? If no then the memory test always needed in the cartride.

Quote
BASIC, ESP, CYRUS and WP 2.6 on a cartridge (64k).

On the EXDOS EPROM you put EXDOS, ISDOS, LISP, FORTH, ASMON, VAR, and EPDOS.

I think it is reasonable to move all these roms from the cartridge into the new 512k EPROM, and free the cartridge bay for other projects.
Yes others can be moved.

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #28 on: 2014.February.03. 17:59:53 »
If I have not opened before the EP was for not to break the membrane keyboard. But I bought a membrane just in case, so I can open it and change the internal ROM. Also I want to install a switch to the speaker.



I have not purchased yet the components, thinking you will "graciously" offer yourself. Thank you very much, we will do that. You purchase, program and send it to me. And the internal EXOS ROM too if you want. Think it must be upgradeable "in situ" too as I've not the programming machine.



I don't know how I'm going to thank you it enough....


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Si no he abierto antes el EP ha sido por no romper la membrana del teclado. Pero he comprado una membrana por si acaso, así que puedo abrirlo y cambiar la ROM interior. También quiero instalar un interruptor al altavoz.

Aun no he comprado los componentes, pensando que tú te ofrecerías "cortésmente". Muchas gracias, así lo haremos. Tú lo compras, lo grabas y me lo mandas. Y el EXOS ROM también si quieres. Piensa que también tiene que poder actualizarse "in situ", pues yo no tengo maquina de programar.

No se como voy a agradecértelo suficientemente.

Offline jltursan

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #29 on: 2014.February.03. 22:57:49 »
Quote
I am able to do those welds, but the process of programming is what intimidates me.

To do the things more rapid (and probably safer...), how about if I send you the EPROM and you fill it of whatever you think necessary....?

I can burn/flash the E/EPROM for you, I've a really good programmer and I live in Madrid; so it can be faster for sure ;-)

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Puedo grabarte la E/EPROM, tengo un programador bastante bueno y vivo en Madrid; así que seguro que sería lo más rápido ;-)