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| From | awanderin <awanderin@gmail.com> |
| Newsgroups | comp.sys.apple2.programmer |
| Subject | Re: code golf (do my homework) |
| Date | Thu, 30 Aug 2018 20:36:03 -0600 |
| Organization | A noiseless patient Spider |
| Lines | 47 |
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qkumba <peter.ferrie@gmail.com> writes:
>> And for 128k, use MACHID from the ProDOS global page,
>
> We are expecting ProDOS to not be present at the time.
> Hence the need to implement these things ourselves.
> It looks like the ProDOS detection is what I need.
> I'll check Lode Runner next.
> Thanks.
Apple's Misc Tech-Note #002 has machine-ID code and includes this
aux-RAM checker:
------------------------------------------------------------
rdmainram equ $C002 ;read main ram
rdcardram equ $C003 ;read aux ram
wrmainram equ $C004 ;write main ram
wrcardram equ $C005 ;write aux ram
[...]
* This is the routine run in the safe area not affected
* by bank-switching the main and aux RAM.
start lda #test4 ;yet another test byte
sta wrcardram ;write to aux while on main zero page
sta rdcardram ;read aux ram as well
sta begpage2 ;check for sparse memory mapping
lda begsprse ;if sparse, these will be the same
cmp #test4 ;value since they're 1K apart
bne auxmem ;yup, there's 128K!
asl begsprse ;may have been lucky so we'll
lda begpage2 ;change the value and see what happens
cmp begsprse
bne auxmem
sec ;oops, no auxiliary memory
bcs goback
auxmem clc
goback sta wrmainram ;write main RAM
sta rdmainram ;read main RAM
jmp back ;continue with program in main mem
done nop ;end of relocated program marker
------------------------------------------------------------
--
--
Jerry awanderin at gmail dot com
Back to comp.sys.apple2.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
code golf (do my homework) qkumba <peter.ferrie@gmail.com> - 2018-08-27 09:08 -0700
Re: code golf (do my homework) Marco Verpelli <mverpelli@libero.it> - 2018-08-27 09:35 -0700
Re: code golf (do my homework) qkumba <peter.ferrie@gmail.com> - 2018-08-27 09:52 -0700
Re: code golf (do my homework) James Davis <JPD.Enterprises@outlook.com> - 2018-08-27 12:30 -0700
Re: code golf (do my homework) John Brooks <jbrooks@blueshiftinc.com> - 2018-08-27 14:36 -0700
Re: code golf (do my homework) qkumba <peter.ferrie@gmail.com> - 2018-08-27 17:53 -0700
Re: code golf (do my homework) John Brooks <jbrooks@blueshiftinc.com> - 2018-08-27 19:28 -0700
Re: code golf (do my homework) Antoine Vignau <antoine.vignau@laposte.net> - 2018-08-27 20:14 -0700
Re: code golf (do my homework) Antoine Vignau <antoine.vignau@laposte.net> - 2018-08-27 20:15 -0700
Re: code golf (do my homework) qkumba <peter.ferrie@gmail.com> - 2018-08-28 11:29 -0700
Re: code golf (do my homework) Antoine Vignau <antoine.vignau@laposte.net> - 2018-08-28 13:37 -0700
Re: code golf (do my homework) Antoine Vignau <antoine.vignau@laposte.net> - 2018-08-28 13:41 -0700
Re: code golf (do my homework) Antoine Vignau <antoine.vignau@laposte.net> - 2018-08-28 13:48 -0700
Re: code golf (do my homework) awanderin <awanderin@gmail.com> - 2018-08-30 20:36 -0600
Re: code golf (do my homework) Antoine Vignau <antoine.vignau@laposte.net> - 2018-09-02 12:21 -0700
Re: code golf (do my homework) Tom Porter <laseractiveguy@gmail.com> - 2018-08-29 06:50 -0700
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