Fine tune
This commit is contained in:
Stefano Furiosi
parent
078c2b47f0
commit
314604d2d0
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@ -5,28 +5,28 @@
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;
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;-------------------------------------------------------------------------
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processor 6502
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org $FF00
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processor 6502
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org $FF00
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;-------------------------------------------------------------------------
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; Memory declaration
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;-------------------------------------------------------------------------
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XAML .EQ $24 Last "opened" location Low
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XAMH .EQ $25 Last "opened" location High
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STL .EQ $26 Store address Low
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STH .EQ $27 Store address High
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L .EQ $28 Hex value parsing Low
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H .EQ $29 Hex value parsing High
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YSAV .EQ $2A Used to see if hex value is given
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MODE .EQ $2B $00=XAM, $7F=STOR, $AE=BLOCK XAM
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XAML equ $24 ;Last "opened" location Low
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XAMH equ $25 ;Last "opened" location High
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STL equ $26 ;Store address Low
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STH equ $27 ;Store address High
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L equ $28 ;Hex value parsing Low
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H equ $29 ;Hex value parsing High
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YSAV equ $2A ;Used to see if hex value is given
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MODE equ $2B ;$00=XAM, $7F=STOR, $AE=BLOCK XAM
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IN .EQ $0200,$027F Input buffer
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IN equ $0200,$027F ;Input buffer
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KBD .EQ $D010 PIA.A keyboard input
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KBDCR .EQ $D011 PIA.A keyboard control register
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DSP .EQ $D012 PIA.B display output register
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DSPCR .EQ $D013 PIA.B display control register
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KBD equ $D010 ;PIA.A keyboard input
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KBDCR equ $D011 ;PIA.A keyboard control register
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DSP equ $D012 ;PIA.B display output register
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DSPCR equ $D013 ;PIA.B display control register
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; KBD b7..b0 are inputs, b6..b0 is ASCII input, b7 is constant high
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; Programmed to respond to low to high KBD strobe
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@ -39,10 +39,10 @@ DSPCR .EQ $D013 PIA.B display control register
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; Constants
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;-------------------------------------------------------------------------
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BS .EQ $DF Backspace key, arrow left key
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CR .EQ $8D Carriage Return
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ESC .EQ $9B ESC key
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PROMPT .EQ "\" Prompt character
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BS equ $DF ;Backspace key, arrow left key
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CR equ $8D ;Carriage Return
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ESC equ $9B ;ESC key
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PROMPT equ "\\" ;Prompt character
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;-------------------------------------------------------------------------
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; Let's get started
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@ -52,13 +52,13 @@ PROMPT .EQ "\" Prompt character
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; are selected.
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;-------------------------------------------------------------------------
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RESET CLD Clear decimal arithmetic mode
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RESET CLD ;Clear decimal arithmetic mode
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CLI
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LDY #%0111.1111 Mask for DSP data direction reg
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STY DSP (DDR mode is assumed after reset)
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LDA #%1010.0111 KBD and DSP control register mask
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STA KBDCR Enable interrupts, set CA1, CB1 for
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STA DSPCR positive edge sense/output mode.
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LDY #%0111.1111 ;Mask for DSP data direction reg
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STY DSP ; (DDR mode is assumed after reset)
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LDA #%1010.0111 ;KBD and DSP control register mask
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STA KBDCR ;Enable interrupts, set CA1, CB1 for
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STA DSPCR ; positive edge sense/output mode.
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; Program falls through to the GETLINE routine to save some program bytes
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; Please note that Y still holds $7F, which will cause an automatic Escape
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@ -67,36 +67,36 @@ RESET CLD Clear decimal arithmetic mode
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; The GETLINE process
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;-------------------------------------------------------------------------
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NOTCR CMP #BS Backspace key?
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BEQ BACKSPACE Yes
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CMP #ESC ESC?
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BEQ ESCAPE Yes
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INY Advance text index
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BPL NEXTCHAR Auto ESC if line longer than 127
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NOTCR CMP #BS ;Backspace key?
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BEQ BACKSPACE ;Yes
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CMP #ESC ;ESC?
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BEQ ESCAPE ;Yes
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INY ;Advance text index
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BPL NEXTCHAR ;Auto ESC if line longer than 127
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ESCAPE LDA #PROMPT Print prompt character
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JSR ECHO Output it.
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ESCAPE LDA #PROMPT ;Print prompt character
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JSR ECHO ;Output it.
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GETLINE LDA #CR Send CR
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GETLINE LDA #CR ;Send CR
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JSR ECHO
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LDY #0+1 Start a new input line
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BACKSPACE DEY Backup text index
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BMI GETLINE Oops, line's empty, reinitialize
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LDY #0+1 ;Start a new input line
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BACKSPACE DEY ;Backup text index
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BMI GETLINE ;Oops, line's empty, reinitialize
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NEXTCHAR LDA KBDCR Wait for key press
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BPL NEXTCHAR No key yet!
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LDA KBD Load character. B7 should be '1'
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STA IN,Y Add to text buffer
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JSR ECHO Display character
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NEXTCHAR LDA KBDCR ;Wait for key press
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BPL NEXTCHAR ;No key yet!
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LDA KBD ;Load character. B7 should be '1'
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STA IN,Y ;Add to text buffer
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JSR ECHO ;Display character
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CMP #CR
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BNE NOTCR It's not CR!
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BNE NOTCR ;It's not CR!
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; Line received, now let's parse it
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LDY #-1 Reset text index
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LDA #0 Default mode is XAM
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TAX X=0
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LDY #-1 ;Reset text index
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LDA #0 ;Default mode is XAM
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TAX ;X=0
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SETSTOR ASL Leaves $7B if setting STOR mode
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@ -0,0 +1,75 @@
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@@@@@@@@@@@@@@@@&^-;,;^&#@@@@@@@@@@@@@@@
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@@@@@@@@@@@@#**+ ..:;^*@@@@@@@@@@@@@
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@@@@@@@@@@&-:.. ... .+@@@@@@@@@@@@
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@@@@@@@@%! .. ....+%@@@@@@@@@@
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@@@@@@@#; . :^#@@@@@@@@
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@@@@@@@= .:;;: =@@@@@@@@
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@@@@@@@; ,,. .. :!+=-: :=@@@@@@@
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@@@@@@*. :=?^!!--;;;^??=^, .&@@@@@@
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@@@@@@+ ,??=+++=+^^++^^+^: +@@@@@@
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@@@@@@? !=^;,::,-^-,..:;^! ,%@@@@@@
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@@@@@@* :++!,. :++: .:;^+: ?@@@@@@@
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@@@@@@%: ;?=+^!!!!-&%+--^+?&!.*@@@@@@@
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@@@@@@@+ ,:,=====+^^=&**?^^=??^:+@@@@@@@
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@@@@@@@#:,,.!-!!!;;!!!-^-;,;!-!.+@@@@@@@
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@@@@@@@@^ :;;,..,,. ..::..,;:,%@@@@@@@
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@@@@@@@@%-. ..::.::,;;!!;,,....?@@@@@@@@
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@@@@@@@@@%-! ...,;;!-^^^^,. :=@@@@@@@@@
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@@@@@@@@%?*=,. ..,;;,,,;;..,?@@@@@@@@@@
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@@@@##%*&%#&-,.....:....:..:+?%@@@@@@@@@
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@#%***%%####?;::. .......,!^**%#@@@@@@@
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%%%%##%%##%##=,,:::...::,!-;^##%%%##@@@@
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##%%%%%%%##%##?;,,,,;,;!-^!;+%####%%####
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%%%%%%%%%####*?+!;,,,,!--!,-?###%%%%%%%%
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WOZ
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@@@@@@@@@@@@@@@@@@@@@@@@@^^@@@@@@@@@@@@@
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@@@@@@@@@@@@@@@@@@@@@@^^^^^@@@@@@@@@@@@@
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@@@@@@@@@@@@@@@@@@@@@^^^^^@@@@@@@@@@@@@@
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@@@@@@@@@@@@@@@@@@@@^^^^^@@@@@@@@@@@@@@@
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@@@@@@@@@@@@@@@@@@@^^^^^@@@@@@@@@@@@@@@@
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@@@@@@@@@@@@^^^@@@@^^@@@@^^^^@@@@@@@@@@@
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@@@@@@@@^^^^^^^^^^^^^^^^^^^^^^^^^@@@@@@@
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@@@@@@^^^^^^^^^^^^^^^^^^^^^^^^^^^^@@@@@@
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@@@@@***************************@@@@@@@@
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@@@@***************************@@@@@@@@@
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@@@@**************************@@@@@@@@@@
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@@@+++++++++++++++++++++++++++@@@@@@@@@@
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@@@+++++++++++++++++++++++++++@@@@@@@@@@
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@@@++++++++++++++++++++++++++++@@@@@@@@@
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@@@@;;;;;;;;;;;;;;;;;;;;;;;;;;;;@@@@@@@@
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@@@@;;;;;;;;;;;;;;;;;;;;;;;;;;;;;@@@@@@@
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@@@@@;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;@@@@@
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@@@@@,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,@@@@@
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@@@@@@,,,,,,,,,,,,,,,,,,,,,,,,,,,,@@@@@@
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@@@@@@@,,,,,,,,,,,,,,,,,,,,,,,,,,@@@@@@@
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@@@@@@@@@;;;;;;;;;;;;;;;;;;;;;;;@@@@@@@@
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@@@@@@@@@@;;;;;;;;@@@@;;;;;;;;@@@@@@@@@@
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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3.3v GND 3.3v Arduino Due
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| | +------\/------+ |
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| +---- 1| Vss /RES |40 -- 3k3 -+--- 52
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+--- 3k3 ----- 2| RDY ϕ2 |39
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| 3| ϕ1 /SO |38
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+--- 3k3 ----- 4| IRQ ϕ0 |37 -------- 53
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| 5| NC NC |36
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+--- 3k3 ----- 6| /NMI NC |35
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| 7| SYNC R/W |34 -------- 51
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+------------- 8| Vcc D0 |33 -------- 49
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22 --------- 9| A0 D1 |32 -------- 48
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23 --------- 10| A1 D2 |31 -------- 47
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24 --------- 11| A2 D3 |30 -------- 46
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25 --------- 12| A3 D4 |29 -------- 45
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26 --------- 13| A4 D5 |28 -------- 44
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27 --------- 14| A5 D6 |27 -------- 43
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28 --------- 15| A6 D7 |26 -------- 42
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29 --------- 16| A7 A15 |25 -------- 30
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37 --------- 17| A8 A14 |24 -------- 31
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36 --------- 18| A9 A13 |23 -------- 32
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35 --------- 19| A10 A12 |22 -------- 33
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34 --------- 20| A11 Vss |21 ---+
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+--------------+ |
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GND
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187
src/main.cpp
187
src/main.cpp
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@ -8,7 +8,7 @@ const int SERIAL_SPEED = 115200; // Arduino Serial Speed
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const int CLOCK_PIN = 52; // TO 6502 CLOCK
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const int RW_PIN = 53; // TO 6502 R/W
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const int CLOCK_DELAY = 5; // HIGH / LOW CLOCK STATE DELAY
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const int CLOCK_DELAY = 4; // HIGH / LOW CLOCK STATE DELAY
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const char SERIAL_BS = 0x08;
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@ -21,21 +21,21 @@ const unsigned int ROM_ADDR = 0xFF00; // ROM
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const unsigned int RAM_BANK1_ADDR = 0x0000; // RAM
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const unsigned int RAM_BANK2_ADDR = 0xE000; // EXTENDED RAM
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const unsigned int XAML = 0x24; // Last "opened" location Low
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const unsigned int XAMH = 0x25; // Last "opened" location High
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const unsigned int STL = 0x26; // Store address Low
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const unsigned int STH = 0x27; // Store address High
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const unsigned int L = 0x28; // Hex value parsing Low
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const unsigned int H = 0x29; // Hex value parsing High
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const unsigned int YSAV = 0x2A; // Used to see if hex value is given
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const unsigned int MODE = 0x2B; // $00=XAM, $7F=STOR, $AE=BLOCK XAM
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const unsigned int XAML = 0x24; // Last "opened" location Low
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const unsigned int XAMH = 0x25; // Last "opened" location High
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const unsigned int STL = 0x26; // Store address Low
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const unsigned int STH = 0x27; // Store address High
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const unsigned int L = 0x28; // Hex value parsing Low
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const unsigned int H = 0x29; // Hex value parsing High
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const unsigned int YSAV = 0x2A; // Used to see if hex value is given
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const unsigned int MODE = 0x2B; // $00=XAM, $7F=STOR, $AE=BLOCK XAM
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const unsigned int IN = 0x200; // Input buffer ($0200,$027F)
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const int RAM_BANK_1_SIZE = 4096;
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const int RAM_BANK_2_SIZE = 4096;
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unsigned char RAM_BANK_1[RAM_BANK_1_SIZE];
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// PIA MAPPING 6821
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// PIA MAPPING 6821
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const unsigned int PIA_ADDR = 0xD000; // PIA 6821 ADDR BASE SPACE
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const unsigned int KBD_ADDR = 0xD010; // Keyb Char - B7 High on keypress
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const unsigned int KBDCR_ADDR = 0xD011; // Keyb Status - B7 High on keypress / Low when ready
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@ -50,14 +50,13 @@ const unsigned char BS = 0xDF; // Backspace key, arrow left key (B7 High)
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const unsigned char CR = 0x8D; // Carriage Return (B7 High)
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const unsigned char ESC = 0x9B; // ESC key (B7 High)
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unsigned int address; // Current address (from 6502)
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unsigned int address; // Current address (from 6502)
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unsigned char bus_data; // Data Bus value (from 6502)
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int rw_state; // Current R/W state (from 6502)
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int rw_state; // Current R/W state (from 6502)
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unsigned int pre_address; // Current address (from 6502)
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unsigned int pre_address; // Current address (from 6502)
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unsigned char pre_bus_data; // Data Bus value (from 6502)
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int pre_rw_state; // Current R/W state (from 6502)
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int pre_rw_state; // Current R/W state (from 6502)
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void setupAddressPins() {
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@ -66,7 +65,7 @@ void setupAddressPins() {
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}
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}
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void busMode(int mode) {
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void setBusMode(int mode) {
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for (int i = 0; i < NUM_DATA_PINS; ++i) {
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pinMode(DATA_PINS[i], mode);
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}
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@ -91,15 +90,16 @@ void readData() {
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}
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void handleRWState() {
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int curent_rw_state=digitalRead(RW_PIN);
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if (rw_state != curent_rw_state) {
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rw_state=curent_rw_state;
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int tmp_rw_state=digitalRead(RW_PIN);
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if (rw_state != tmp_rw_state) {
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rw_state=tmp_rw_state;
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if (rw_state) {
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// State HIGH - WRITE TO 6502 Data Bus
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busMode(OUTPUT);
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setBusMode(OUTPUT);
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} else {
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// State LOW - READ FROM 6502 Data Bus
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busMode(INPUT);
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setBusMode(INPUT);
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}
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}
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}
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@ -111,6 +111,42 @@ void byteToDataBus(unsigned char data) {
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}
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}
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void PIAWrite() {
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switch (address) {
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case KBD_ADDR:
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KBD=bus_data;
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break;
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case KBDCR_ADDR:
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KBDCR=bus_data;
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break;
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case DSP_ADDR:
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DSP = bus_data;
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switch(DSP) {
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case CR:
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Serial.write('\r');
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Serial.write('\n');
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break;
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case BS:
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Serial.write(SERIAL_BS);
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break;
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default:
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Serial.write(DSP & 0x7F);
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break;
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}
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bitClear(DSP, 7);
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break;
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case DSPCR_ADDR:
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DSPCR=bus_data;
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break;
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}
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}
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// READ FROM DATA BUS - STORE AT RELATED ADDRESS
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void readFromDataBus() {
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readData();
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@ -124,37 +160,40 @@ void readFromDataBus() {
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RAM_BANK_2[address-RAM_BANK2_ADDR]=bus_data;
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break;
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case 0xD:
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// 6821
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switch (address) {
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case KBD_ADDR:
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KBD=bus_data;
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break;
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case KBDCR_ADDR:
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KBDCR=bus_data;
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break;
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case DSP_ADDR:
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DSP = bus_data;
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if (DSP == CR) {
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// Simulate CR
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Serial.write('\r');
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Serial.write('\n');
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} else if (DSP == BS) {
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// BACKSPACE
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Serial.write(SERIAL_BS);
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} else {
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Serial.write(DSP & 0x7F);
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}
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// Display Ready - clear B7
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bitClear(DSP, 7);
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break;
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case DSPCR_ADDR:
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DSPCR=bus_data;
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break;
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}
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PIAWrite();
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break;
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}
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}
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unsigned char PIARead() {
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unsigned char val;
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// PIA 6821
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switch (address) {
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case KBD_ADDR:
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val=KBD;
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// We'v read the char, clear B7
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bitClear(KBDCR, 7);
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break;
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case KBDCR_ADDR:
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val=KBDCR;
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break;
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case DSP_ADDR:
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val=DSP;
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break;
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case DSPCR_ADDR:
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val=DSPCR;
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break;
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default:
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val=0;
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}
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return val;
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}
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// WRITE FROM DATA BUS A BYTE FROM RELATED ADDRESS
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void writeToDataBus() {
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unsigned char val=0;
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@ -170,25 +209,7 @@ void writeToDataBus() {
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val=ROM[address-ROM_ADDR];
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break;
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case 0xD:
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// PIA 6821
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switch (address) {
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case KBD_ADDR:
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val=KBD;
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// We'v read the char, clear B7
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bitClear(KBDCR, 7);
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break;
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case KBDCR_ADDR:
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val=KBDCR;
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break;
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case DSP_ADDR:
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val=DSP;
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break;
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case DSPCR_ADDR:
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val=DSPCR;
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break;
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default:
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val=0;
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}
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val=PIARead();
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break;
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default:
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val=0;
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@ -217,19 +238,16 @@ void handleKeyboard() {
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// BS
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tempKBD = 0x5F;
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break;
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}
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KBD = tempKBD;
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|
||||
// Step B7 on KBD so that the code know a new char is in
|
||||
bitSet(KBD, 7);
|
||||
bitSet(KBDCR, 7);
|
||||
}
|
||||
}
|
||||
|
||||
void autload() {
|
||||
|
||||
unsigned int adddr = AUTLOAD[1] | AUTLOAD[0] << 8;
|
||||
Serial.print("AUTOLOAD AT: ");
|
||||
Serial.println(adddr, HEX);
|
||||
|
|
@ -242,9 +260,12 @@ void autload() {
|
|||
void setup() {
|
||||
pinMode(CLOCK_PIN, OUTPUT);
|
||||
pinMode(RW_PIN, INPUT);
|
||||
|
||||
setupAddressPins();
|
||||
busMode(OUTPUT);
|
||||
setBusMode(OUTPUT);
|
||||
|
||||
Serial.begin(SERIAL_SPEED);
|
||||
|
||||
Serial.println("----------------------------");
|
||||
Serial.println("APPLE 1 REPLICA by =STID=");
|
||||
Serial.println("----------------------------");
|
||||
|
|
@ -257,12 +278,14 @@ void setup() {
|
|||
Serial.print("ERAM: ");
|
||||
Serial.print(sizeof(RAM_BANK_2));
|
||||
Serial.println(" BYTE");
|
||||
|
||||
autload();
|
||||
|
||||
Serial.println("----------------------------");
|
||||
|
||||
}
|
||||
|
||||
void loop () {
|
||||
void handleClock() {
|
||||
// LOW CLOCK
|
||||
digitalWrite(CLOCK_PIN, LOW);
|
||||
delayMicroseconds(CLOCK_DELAY);
|
||||
|
|
@ -273,24 +296,20 @@ void loop () {
|
|||
// HIGH CLOCK
|
||||
digitalWrite(CLOCK_PIN, HIGH);
|
||||
delayMicroseconds(CLOCK_DELAY);
|
||||
}
|
||||
|
||||
// ALWAYS READ ADDR
|
||||
readAddress();
|
||||
|
||||
void handleBusRW() {
|
||||
// READ OR WRITE TO BUS?
|
||||
|
||||
if (pre_address != address || pre_rw_state != rw_state) {
|
||||
rw_state ? writeToDataBus() : readFromDataBus();
|
||||
} else {
|
||||
pre_address = address;
|
||||
pre_rw_state = rw_state;
|
||||
}
|
||||
|
||||
handleKeyboard();
|
||||
}
|
||||
|
||||
// WOZ TEST (As on the Apple 1 Manual)
|
||||
// 0:A9 9 AA 20 EF FF E8 8A 4C 2 0
|
||||
|
||||
// HELLO WORLD
|
||||
// 280:A2 C BD 8B 2 20 EF FF CA D0 F7 60 8D C4 CC D2 CF D7 A0 CF CC CC C5 C8
|
||||
void loop () {
|
||||
handleClock();
|
||||
readAddress();
|
||||
handleBusRW();
|
||||
handleKeyboard();
|
||||
}
|
||||
|
|
|
|||
File diff suppressed because one or more lines are too long
Loading…
Reference in New Issue