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bank switching words?
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Mux
Aug 29, 2015, 2:46:09 PM8/29/15
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Hi All,
Anyone have any suggestions for words that handle bank-switching? Basically I have 3 regions (region #0 is locked) that can be switched out and I'm trying to come up with words that make it easy to understand. Right now it's just a poke into a memory register which, while fine, isn't ideal. I've decoupled IO and memory access so there's that distinction, but still..
Also, a quick search on clf didn't really yield a lot about bank switching which is probably because forth programs themselves tend to be small. That said, once you start adding graphics / audio, it gets gobbled up quickly...
Thoughts?
-Y
Anyone have any suggestions for words that handle bank-switching? Basically I have 3 regions (region #0 is locked) that can be switched out and I'm trying to come up with words that make it easy to understand. Right now it's just a poke into a memory register which, while fine, isn't ideal. I've decoupled IO and memory access so there's that distinction, but still..
Also, a quick search on clf didn't really yield a lot about bank switching which is probably because forth programs themselves tend to be small. That said, once you start adding graphics / audio, it gets gobbled up quickly...
Thoughts?
-Y
Mark Wills
Aug 30, 2015, 2:23:52 PM8/30/15
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Maybe this will give you some inspiration: http://turboforth.net/resources/sams.html
HTH
Mux
Sep 2, 2015, 1:59:03 PM9/2/15
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-Y
Marcos Cruz
Sep 6, 2015, 1:38:17 PM9/6/15
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En/Je/On 2015-08-29, Mux <Yvo....@gmail.com> escribi'o/skribis/wrote:
> Anyone have any suggestions for words that handle bank-switching?
I use simply `bank`:
> Anyone have any suggestions for words that handle bank-switching?
bank ( n -- )
Page memory bank _n_ (0..7) in at 0xC000..0xFFFF.
Regards,
--
Marcos Cruz
http://programandala.net
Marcos Cruz
Sep 6, 2015, 2:17:55 PM9/6/15
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En/Je/On 2015-08-30, Mark Wills <markwi...@gmail.com>
escribió/skribis/wrote:
Mark, that is great.
In a Forth for ZX Spectrum 128, I store the name fields in a separate 16
KiB memory bank, with an additional field that links every nfa to its
cfa in main memory. That saves a lot of dictionary space (c. 3 KiB on
the bare unexpanded system) and makes name lengths unimportant. By
design, no field links the main headers to their name fields, what saves
2 bytes per word in the main memory. Therefore `cfa>nfa` and others do
a brute force search, checking the pointers that link every name field
with its code field, but that's not a problem.
The way TurboForth words can be compiled in different memory banks
transparently is a great idea. I'll think about it. It could be useful
to compile the Z80 assembler permanently without wasting memory, instead
of using the usual tricks to compile it at a different location and then
disconnect it from the dictionary.
escribió/skribis/wrote:
Mark, that is great.
In a Forth for ZX Spectrum 128, I store the name fields in a separate 16
KiB memory bank, with an additional field that links every nfa to its
cfa in main memory. That saves a lot of dictionary space (c. 3 KiB on
the bare unexpanded system) and makes name lengths unimportant. By
design, no field links the main headers to their name fields, what saves
2 bytes per word in the main memory. Therefore `cfa>nfa` and others do
a brute force search, checking the pointers that link every name field
with its code field, but that's not a problem.
The way TurboForth words can be compiled in different memory banks
transparently is a great idea. I'll think about it. It could be useful
to compile the Z80 assembler permanently without wasting memory, instead
of using the usual tricks to compile it at a different location and then
disconnect it from the dictionary.
Mux
Sep 8, 2015, 12:40:35 AM9/8/15
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> I use simply `bank`:
>
> bank ( n -- )
>
> Page memory bank _n_ (0..7) in at 0xC000..0xFFFF.
>
I like that one :-) Thanks for chiming in!
>
> bank ( n -- )
>
> Page memory bank _n_ (0..7) in at 0xC000..0xFFFF.
>
-Mux
Whammo
Sep 9, 2015, 11:00:25 PM9/9/15
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What's wrong with?
: bank abcd ; (whatever the address)
0 bank c@
Gerry Jackson
Sep 13, 2015, 4:26:31 PM9/13/15
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