annotate level1/modules/p_dpp.asm @ 3130:e0614e08fa5e

l1 boot modules: Expand documentation and clean up code Tidy up white-space and indentation. Expand documentation to show C flag is important on return from HWRead. Expand documentation to show how/why/when filler is needed at end of file. Delete dead code in some places. No functional changes.
author Neal Crook <foofoobedoo@gmail.com>
date Sun, 04 Dec 2016 21:01:42 +0000
parents 25b468210b37
children
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b66fa207b9fe Paralell printer descriptor for Dragon 32/64/Alpha
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1 *
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2 * Dragon 32/64/Alpha printer device descriptor.
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3 *
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4 * Disassembled from the Alpha OS-9 2005-06-16, P.Harvey-Smith.
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5 *
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6
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7 nam p
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8 ttl Dragon parallel printer device discriptor
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9
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10 ifp1
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11 use defsfile
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12 endc
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13
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14 tylg set Devic+Objct
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15 atrv set ReEnt+rev
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16 rev set $01
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17 mod eom,name,tylg,atrv,mgrnam,drvnam
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18
b66fa207b9fe Paralell printer descriptor for Dragon 32/64/Alpha
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19 fcb $03 mode byte
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20 fcb $FF extended controller address
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21 fdb $0000 physical controller address
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22 fcb initsize-*-1 initilization table size
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23 fcb $00 device type:0=scf,1=rbf,2=pipe,3=scf
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24 fcb $00 case:0=up&lower,1=upper only
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25 fcb $00 backspace:0=bsp,1=bsp then sp & bsp
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26 fcb $00 delete:0=bsp over line,1=return
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27 fcb $00 echo:0=no echo
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28 fcb $01 auto line feed:0=off
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29 fcb $00 end of line null count
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30 fcb $00 pause:0=no end of page pause
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31 fcb $42 lines per page
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32 fcb $08 backspace character
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33 fcb $18 delete line character
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34 fcb $0D end of record character
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35 fcb $00 end of file character
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36 fcb $04 reprint line character
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37 fcb $01 duplicate last line character
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38 fcb $17 pause character
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39 fcb $00 interrupt character
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40 fcb $00 quit character
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41 fcb $5F backspace echo character
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42 fcb $07 line overflow character (bell)
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43 fcb $00 init value for dev ctl reg
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44 fcb $00 baud rate
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45 fdb name copy of descriptor name address
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46 fcb $00 acia xon char
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47 fcb $00 acia xoff char
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48
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49 initsize equ *
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50 name equ *
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51 fcs /P/
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52 mgrnam equ *
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53 fcs /SCF/
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54 drvnam equ *
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55 fcs /scdpp/
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56
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57 emod
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58 eom equ *
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59 end