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Groups > comp.lang.forth > #43752
| From | Lars Brinkhoff <lars.spam@nocrew.org> |
|---|---|
| Newsgroups | comp.lang.forth |
| Subject | Emulating a 16-bit Forth |
| Organization | nocrew |
| References | (16 earlier) <n1p8g9$5t1$1@dont-email.me> <87a8qnu5g7.fsf@nightsong.com> <56408caf.141582139@news.eternal-september.org> <86twobwzqi.fsf@vps34351.public.cloudvps.com> <86egffwl44.fsf@vps34351.public.cloudvps.com> |
| Date | 2015-11-25 13:18 +0100 |
| Message-ID | <86k2p6uval.fsf_-_@vps34351.public.cloudvps.com> (permalink) |
>>>>> Immediate inspiration: I'm interested in running an app (not yet >>>>> written) on a TI MSP430, that uses a 16 bit CPU. I'd prefer to >>>>> write and debug the computational part of the app on a Linux box >>>>> for greater convenience. Right now there doesn't seem to be any >>>>> 16-bit Forth for Linux. >>>> >>>> Item 2 [a 16-bit Forth] is easy to do with a new vocabulary or word >>>> list. >>> >>> How would you easily implement @ in this vocabulary? >> >> If we are emulating a 16 bit CPU, then declare a 64k buffer and index >> into it. To allow for 16 bit access, assume that the 32 bit host has >> a word W@ ( addr -- x16 ). >> >> 64 kb buffer: vmem >> >> ... >> >> : @ ( addr16 -- x16 ) >> $FFFF and vmem + w@ >> ; > > The purpuse was to emulate a 16-bit Forth with a new vocabulary. So > if we go down this route, I guess we'd have to redefine VARIABLE etc > too to allocate data space inside this buffer. > > We still want to tick colon definitions and use EXECUTE and DEFER etc. So maybe something like this? It's kind of like a cross compiler for a 16-bit target, except the code lives in the host. only forth definitions vocabulary forth16 65536 constant #data create data #data allot variable dp 0 dp ! : mask 65535 and ; : ?addr dup -65536 and abort" Not a 16-bit address!" ; : >host ?addr data + ; : mask: >in @ >r : r> >in ! ' compile, postpone mask postpone ; ; : h: : ; : h; postpone ; ; immediate also forth16 definitions \ Add lots of these... mask: + mask: - mask: * mask: / : here dp @ ; : allot dp +! ; : execute >host @ execute ; : does does> @ execute ; : : create here dup , 1 cells allot does :noname ; h: ; postpone ; swap >host ! ; immediate h: create create here , does> @ h; h: variable create 2 allot h; h: ' ' >body @ h; h: >body h; h: c@ >host c@ h; h: c! >host c! h; \ Little endian versions. h: @ dup c@ swap 1+ c@ 8 lshift + h; h: ! 2dup c! swap 8 rshift swap 1+ c! h; h: c, here c! 1 allot h; h: , here ! 2 allot ; only forth definitions
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Stoked Chris Curl <ccurl609@gmail.com> - 2015-10-28 09:04 -0700
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Re: Stoked Albert van der Horst <albert@spenarnc.xs4all.nl> - 2015-11-09 14:19 +0000
Re: Stoked Lars Brinkhoff <lars.spam@nocrew.org> - 2015-11-23 07:47 +0100
Re: Stoked Albert van der Horst <albert@spenarnc.xs4all.nl> - 2015-11-23 11:27 +0000
Re: Stoked Lars Brinkhoff <lars.spam@nocrew.org> - 2015-11-23 13:43 +0100
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Emulating a 16-bit Forth Lars Brinkhoff <lars.spam@nocrew.org> - 2015-11-25 13:18 +0100
Re: Emulating a 16-bit Forth Lars Brinkhoff <lars.spam@nocrew.org> - 2015-11-25 14:08 +0100
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