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grzeg2
 Post subject: SDRAM as adress decoder
PostPosted: Mon Feb 22, 2016 3:46 pm 
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Joined: Sun Feb 21, 2016 5:48 pm
Posts: 1
Hello.
I would like the system 6502 get the opportunity to change the map memory and I / O on the fly.
He wants to apply SRAM as adress decoder.
What do you think about this idea, and what problems to pay attention.
Similar to:
http://mikenaberezny.com/hardware/projects/pla-replacement/
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BitWise
PostPosted: Mon Feb 22, 2016 4:52 pm 
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Joined: Tue Mar 02, 2004 8:55 am
Posts: 996
Location: Berkshire, UK
grzeg2 wrote:
Hello.
I would like the system 6502 get the opportunity to change the map memory and I / O on the fly.
He wants to apply SRAM as adress decoder.
What do you think about this idea, and what problems to pay attention.
Similar to:
http://mikenaberezny.com/hardware/projects/pla-replacement/

It's possible. An operating system for the 6809, OS-9 level 2, used to use this trick.

https://en.m.wikipedia.org/wiki/OS-9

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Andrew Jacobs
6502 & PIC Stuff - http://www.obelisk.me.uk/
Cross-Platform 6502/65C02/65816 Macro Assembler - http://www.obelisk.me.uk/dev65/
Open Source Projects - https://github.com/andrew-jacobs
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