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Author Topic: EPROM/Flash ROM/SRAM expansions (Read 26983 times)

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #45 on: 2014.February.05. 11:09:00 »
Here is a ROM package, the standalone ROM-s linked for one 512K file for easier programming. The HxC ROM version was put to the last 64K, so it can be easily reflashed because new versions will come :-)
« Last Edit: 2014.February.05. 11:43:16 by szipucsu »

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #46 on: 2014.February.05. 11:28:10 »
The two 512k SRAMs are in my hand, the EPROMs on a few days.

I have started to make changes in the Microteam card, I have doubled the memory space by doing the cuts and bridges Zozo suggested.

Looks like we're all going very fast, but ...

Now I'm going to change the sockets pins, but there's one thing I do not understand, and is: from where do I take the WE signal?

I have reviewed the notes, but I can't find that information ....

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Ya tengo las SRAM en la mano, en unos días las EPROM.

He empezado a hacer las modificaciones en la tarjeta Microteam, he doblado el espacio de memoria haciendo los cortes y los puentes que Zozo sugirió.

Parece que todos vamos muy rápido, pero...

Ahora voy a modificar los zócalos, pero hay una cosa que no entiendo, y es: ¿de donde hay que tomar la señal WE?

He repasado los apuntes y no encuentro esa información...
« Last Edit: 2014.February.05. 11:34:26 by gflorez »

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #47 on: 2014.February.05. 11:59:39 »
Quote from: gflorez
from where do I take the WE signal?
The nearest are: wire at IC 11 pin 3:
 10223-0

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #48 on: 2014.February.06. 12:09:57 »
I'm doing the last bridges to the card.

You say that the order of the addresses is not significant in the SRAM, and Iunderstand it, because it is empty at first, but what about an EPROM already programmed if you change the order of the addresses?

I say this because in the 128K EPROM you put A17 on pin 3 of the chip. and I think it should have been A15, right?

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Estoy haciendo los últimos puentes a la tarjeta.

Dices que el orden de las direcciones no es importante en la SRAM, y lo entiendo, porque está vacia en principio, pero, ¿qué pasa con una EPROM ya programada si se le cambia el orden de las direcciones?

Lo digo porque  en la EPROM de 128K tú pusiste A17 en la patilla 3 del chip. y yo creo que debería haber sido A15, ¿no?

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #49 on: 2014.February.06. 12:31:40 »
Quote from: gflorez
what about an EPROM already programmed if you change the order of the addresses?
The right order is needed.

Quote
I say this because in the 128K EPROM you put A17 on pin 3 of the chip. and I think it should have been A15, right?
A17??? It needs A15. Why do you think that A17? I see the photo of your card and A15 wire coming from the Expansion bus B9 pin to EPROMs pin 1 which are the pin 3 at the longer ICs.
« Last Edit: 2014.February.06. 12:35:38 by szipucsu »

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #50 on: 2014.February.06. 13:14:05 »
Sorry, I was confused as the main connector is soldered backwards, so A1 and B1 are next to the Shugart connector!


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Perdón, Me ha confundido el conector principal, que está soldado al revés, por lo que A1 y B1, ¡están próximos al conector Shugart!

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #51 on: 2014.February.06. 13:21:37 »
Quote from: gflorez
Sorry, I was confused as the main connector is soldered backwards, so A1 and B1 are next to the Shugart connector!
??? No, the A1/B1 next to the keyboard!

All connectors at the Enterprise view frontwise on the machine A1 the left bottom, B1 left top.

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #52 on: 2014.February.06. 16:36:36 »
Strange result, what do you think of this?
------------------------------
Extraño resultado, ¿que opinas de esto?

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #53 on: 2014.February.06. 16:39:28 »
EXDOS ROM isn't working now, and only half of SRAM.

DRAM works.

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #54 on: 2014.February.06. 16:45:53 »
SRAM,ROM are fixed or can be removable from socket?
If can be removable then what happen with only one SRAM?

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #55 on: 2014.February.06. 16:51:50 »
The three chips are on sockets, and whatever SRAM alone gives 256k working and 256k not working
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Los tres chips están sobre zócalos, y cualquiera de las SRAMS da 256k funcionado y 256k no.

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #56 on: 2014.February.06. 16:54:23 »
Surely what can be read from the EPROM are unreadable pieces.
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Seguramente lo que se puede leer de la EPROM son trozos ilegibles.

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #57 on: 2014.February.06. 16:54:46 »
Quote from: Zozosoft
When installing 512K ICs to the ROM sockets connect A21 address line as A18 at the ICs.
Do you do this?

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #58 on: 2014.February.06. 16:57:58 »
I'll keep checking, it can be some stupid negligence .....
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Seguiré comprobando, puede que sea algún descuido estúpido...
« Last Edit: 2014.February.06. 18:53:12 by gflorez »

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #59 on: 2014.February.06. 17:02:33 »
No....... Ive connected A18 from the Expansion bay to A18 from socket.....I have to read more ....
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No........ He conectado A18 del puerto de Expansión a A18 del los zócalos, tengo que leer mas...