ZX-UNO with 512Kb? How to turn it ON?

Dudas, cuestiones, sugerencias y peticiones en general sobre el proyecto / Questions and requests about the project
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Black_Cat
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Re: ZX-UNO with 512Kb? How to turn it ON?

Mensaje por Black_Cat » 30 Jun 2016, 03:12

antoniovillena escribió:
Black_Cat escribió: The architecture of the Scorpion is not popular, this architecture has meaning only in conjunction with the old software. The Pentagon with 256k did not exist, only 512k. Memory expansion for D6 #7FFD is associated with a large number of software bugs and is not recommended for repetition. The best option when creating a new software is an expansion to 256k for D7 #7FFD. While CS#7FFD/ = A1+ A14/ + A15 + IORQGE + WR/
Thank you for the info. Do you now any software for 512K Pentagon to test? The ZX-Uno has 512K of SRAM (RAM from external chip), so i think McLeod can use all the RAM but erasing the system ROMs. If the software needs system calls is possible perhaps to have a small area of ROM implemented in BRAM (the RAM into the FPGA).
Not to do the architecture of the Pentagon-512, to its implementation are insufficient resources in the ZX-UNO. You can do the extended memory 256k standard Scorpion through D4 #1FFD (CS#1FFD/ = A1 + A14 + A15 + IORQGE + WR/) , or through D7 #7FFD (CS#7FFD/ = A1 + A14/ + A15 + IORQGE + WR/). The first option is preferable to operate the old software and the second option is preferable to creating new software, since this option is compatible with most modern architectures exUSSR computers.

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YERZMYEY
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Re: ZX-UNO with 512Kb? How to turn it ON?

Mensaje por YERZMYEY » 18 Jul 2016, 20:34

Hey,

just checking out whether You had an opportunity to include the 256K feature.

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mcleod_ideafix
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Re: ZX-UNO with 512Kb? How to turn it ON?

Mensaje por mcleod_ideafix » 18 Jul 2016, 21:10

YERZMYEY escribió:Hey,

just checking out whether You had an opportunity to include the 256K feature.
Sorry. No opportunity yet. I wanted first to have a closure on required functionality in order to have an established design from where to expand it to add more "exotic" features, such as yours.
http://www.zxuno.com
ZX-Uno · Clon de ordenador ZX Spectrum basado en FPGA

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YERZMYEY
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Re: ZX-UNO with 512Kb? How to turn it ON?

Mensaje por YERZMYEY » 18 Jul 2016, 21:21

No problem, just askin' ;)

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Black_Cat
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Re: ZX-UNO with 512Kb? How to turn it ON?

Mensaje por Black_Cat » 18 May 2017, 14:55

antoniovillena escribió:
mcleod_ideafix escribió: Antonio, after the last modifications to the core to get 8KB of boot ROM, we ran out of BRAM resources :(
Yes. I thought in these 8K of ROM. We can't put all the 32K but only with the most important system calls will suffice for avoid crashing in the software.
Por lo que puedo juzgar, el uso adicional de 128kb para EXT bank & DOC bank, es el más desgraciado el gasto de ram. Por desgracia, la realidad es que el software para la arquitectura de Chloe-280SE crear nadie más que a Vosotros mismos, no se. Esto se debe a que hasta el ZX-UNO, esta arquitectura nadie apoyaba ni el software, ni hardware. Por lo tanto, puedo afirmar que la arquitectura de Chloe-280SE, inicialmente se murió al nacer. ZX-UNO es demasiado poco de ram, que habría de gastar a sabiendas de que muerta la arquitectura. Yo recomendaría considerar la posibilidad de reconfigurar página de memoria ram 24-31 para su uso en otras arquitecturas.

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