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44 lines
1.6 KiB
Plaintext
44 lines
1.6 KiB
Plaintext
require'vcs' -- import vcs.l65
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-- translate 'far x' to 'farcall(function() return x end)', farcall is defined in vcs.l65
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#pragma encapsulate far farcall
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-- translate 'xsr x' to 'xcall(function() return x end)', xcall is defined in vcs.l65
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#pragma encapsulate xsr xcall
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-- translate 'rtx' to 'rtximp()', rtximp is defined in vcs.l65
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#pragma add_opcode rtx imp
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-- enable generation of cross banks code sections using xsr/rtx method (3 MSB of address = bank index)
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mappers.jmpfar=true
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mappers.F8() -- use F8 (2 * 4Kb) bank mapper
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local bank_core,bank_fx = rom0,rom1 -- bank name aliases
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-- main bank content
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location(bank_core)
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@@main
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init()
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@_frame
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overscan() vblank() screen_begin()
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-- call section 'kernel' in bank_fx using per-function generated stubs
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far kernel
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-- make a separation
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sta WSYNC lda#0xaa sta COLUBK for i=1,10 do sta WSYNC end
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-- call section 'kernel2' in bank_fx using shared stub with bank index in 3 MSB of address
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xsr kernel2
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screen_end()
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jmp _frame
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-- secondary bank content
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location(bank_fx)
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-- regular function, can be called inside the same bank with a jsr or from
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-- another bank using automatic stubs generation for caller/callee pair
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@@kernel
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ldx#0x50 @_loop sta WSYNC stx COLUBK dex bne _loop rts
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-- function only callable using xsr method, from any bank without additional
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-- stub generation, but higher cycle count overhead
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@@kernel2
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ldx#0x50 @_loop sta WSYNC stx COLUBK dex bne _loop rtx -- note the 'rtx' instead of 'rts'!
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;
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writebin(filename..'.bin')
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writesym(filename..'.sym')
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print(stats)
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