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AppleIISd
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Support for second partition, card detect and write protect added

This commit is contained in:
Florian Reitz 2017-09-09 20:34:24 +02:00
parent b845ad2cc9
commit 2a06e1ba5d
7 changed files with 1511 additions and 1380 deletions
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AppleIISd.bin
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AppleIISd.hex Normal file
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1399
AppleIISd.lst
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188
AppleIISd.s
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@ -45,7 +45,7 @@ FRX = $10 ; CTRL register
ECE = $04
SS0 = $01 ; SS register
WP = $20
CARDDET = $40
CD = $40
INITED = $80
@ -65,28 +65,30 @@ INITED = $80
STA CURSLOT
LDA #$40
STA SLOT16
ELSE
JSR $FF58
TSX
LDA $0100,X
STA CURSLOT ; $Cs
AND #$0F
STA SLOT ; $0s
ORA #$C0
STA CURSLOT ; $Cs
ASL A
ASL A
ASL A
ASL A
STA SLOT16 ; $s0
FIN
TAX ; X holds now SLOT16
BIT $CFFF
JSR INIT
JSR CARDDET
BCC :INIT
LDA #$27 ; no card inserted
BRK
:INIT JSR INIT
*
* TODO: check for init error
*
********************************
*
@ -144,7 +146,11 @@ INSTALL LDA $BF32,X ; get a devnum
ELSE
BOOT LDA #$01
BOOT CMP #0 ; check for error
BEQ :BOOT1
BRK
:BOOT1 LDA #$01
STA $42 ; load command
LDA SLOT16
TAX
@ -168,6 +174,7 @@ BOOT LDA #$01
********************************
DRIVER CLD
DO DEBUG
LDA #$04
STA SLOT
@ -175,38 +182,44 @@ DRIVER CLD
STA CURSLOT
LDA #$40
STA SLOT16
ELSE
JSR $FF58 ; find slot nr
TSX
LDA $0100,X
STA CURSLOT ; $Cs
AND #$0F
STA SLOT ; $0s
ORA #$C0
STA CURSLOT ; $Cs
ASL A
ASL A
ASL A
ASL A
STA SLOT16 ; $s0
FIN
TAX ; X holds now SLOT16
TAX ; X holds now SLOT16
BIT $CFFF
LDA #INITED ; check for init
JSR CARDDET
BCC :INITED
LDA #$27 ; no card inserted
BRA :DONE
:INITED LDA #INITED ; check for init
BIT SS,X
BEQ :INIT
:CMD LDA $42 ; get command
CMP #$00
CMP #0
BEQ :STATUS
CMP #$01
CMP #1
BEQ :READ
CMP #$02
CMP #2
BEQ :WRITE
CMP #$03
CMP #3
BEQ :FORMAT
SEC ; unknown command
LDA #$01
LDA #1 ; unknown command
:DONE SEC
RTS
:STATUS JMP STATUS
@ -221,8 +234,8 @@ DRIVER CLD
DS \ ; fill with zeroes
DS -4 ; locate to $xxFC
DW $FFFF ; 65535 blocks
DB $47 ; Status bits
DW $0000 ; use status request
DB $17 ; Status bits
DB #<DRIVER ; LSB of driver
@ -442,6 +455,7 @@ GETR3 JSR GETR1 ; get R1 first
********************************
*
* Calculate block address
* Unit number is in $43 DSSS0000
* Block no is in $46-47
* Address is in R30-R33
*
@ -458,7 +472,13 @@ BLOCK PHX ; save X
STA R31,X
STA R30,X
LDY #9 ; ASL can't be used with Y
LDA #$80 ; drive number
BIT $43
BEQ :SHIFT ; D1
LDA #1 ; D2
STA R31,X
:SHIFT LDY #9 ; ASL can't be used with Y
:LOOP ASL R33,X ; mul block num
ROL R32,X ; by 512 to get
ROL R31,X ; real address
@ -495,6 +515,44 @@ COMMAND PHY ; save Y
RTS
********************************
*
* Check for card detect
*
* C Clear - card in slot
* Set - no card in slot
*
********************************
CARDDET PHA
LDA #CD ; 0: card in
BIT SS,X ; 1: card out
CLC
BEQ :DONE ; card is in
SEC ; card is out
:DONE PLA
RTS
********************************
*
* Check for write protect
*
* C Clear - card not protected
* Set - card write protected
*
********************************
WRPROT PHA
LDA #WP ; 0: write enabled
BIT SS,X ; 1: write disabled
CLC
BEQ :DONE
SEC
:DONE PLA
RTS
********************************
*
* Status request
@ -508,18 +566,20 @@ COMMAND PHY ; save Y
* $27 - I/O error
* $28 - No card inserted / no init
* $2B - Card write protected
* x - Blocks avail (low byte)
* y - Blocks avail (high byte)
* X - Blocks avail (low byte)
* Y - Blocks avail (high byte)
*
********************************
STATUS CLC ; no error
LDA #0
STATUS LDA #0 ; no error
LDX #$FF ; 32 MB partition
LDY #$FF
RTS
* TODO: check for card detect and write protect!
JSR WRPROT
BCC :DONE
LDA #$2B ; card write protected
:DONE RTS
********************************
@ -537,9 +597,10 @@ STATUS CLC ; no error
*
********************************
* TODO: check for card detect!
READ JSR CARDDET
BCS :ERROR ; no card inserted
READ JSR BLOCK ; calc block address
JSR BLOCK ; calc block address
LDA SS,X ; enable /CS
AND #$FF!SS0
@ -573,32 +634,34 @@ READ JSR BLOCK ; calc block address
DEY
BNE :LOOPY
:CRC LDA DATA,X ; read two bytes crc
LDA DATA,X ; and ignore
LDA DATA,X ; read a dummy byte
LDA CTRL,X ; disable FRX
AND #$FF!FRX
STA CTRL,X
CLC ; no error
LDA #0
:CRC LDA #DUMMY ; first crc byte has
STA DATA,X ; already been read
:DONE PHP
PHA
LDA SS,X
ORA #SS0
STA SS,X ; disable /CS
CLC ; no error
LDA #$00
PLA
PLP
RTS
:ERROR LDA SS,X
ORA #SS0
STA SS,X ; disable /CS
SEC ; an error occured
:ERROR SEC ; an error occured
LDA #$27
RTS
BRA :DONE
********************************
*
* Write 512 byte block
* $43 Unit number DSSS000
* $43 Unit number DSSS0000
* $44-45 Address (LO/HI) of buffer
* $46-47 Block number (LO/HI)
*
@ -606,14 +669,17 @@ READ JSR BLOCK ; calc block address
* Set - Error
* A $00 - No error
* $27 - I/O error or bad block number
* $28 - No card inserted
* $2B - Card write protected
*
********************************
* TODO: check for card detect and write protect!
WRITE JSR CARDDET
BCS :IOERROR ; no card inserted
WRITE JSR BLOCK ; calc block address
JSR WRPROT
BCS :WPERROR ; card write protected
JSR BLOCK ; calc block address
LDA SS,X ; enable /CS
AND #$FF!SS0
@ -622,7 +688,7 @@ WRITE JSR BLOCK ; calc block address
JSR COMMAND ; send command
CMP #0 ; check for error
BNE :ERROR
BNE :IOERROR
LDA #DUMMY
STA DATA,X ; send dummy
@ -648,33 +714,33 @@ WRITE JSR BLOCK ; calc block address
LDA DATA,X
AND #$1F
CMP #$05
BNE :ERROR ; check for write error
BNE :IOERROR ; check for write error
CLC ; no error
LDA #0
:WAIT6 LDA #DUMMY
:DONE PHP
PHA
:WAIT LDA #DUMMY
STA DATA,X ; wait for write cycle
LDA DATA,X ; to complete
CMP #$00
BEQ :WAIT6
BEQ :WAIT
LDA SS,X ; disable /CS
ORA #SS0
STA SS,X
CLC ; no error
LDA #0
PLA
PLP
RTS
:ERROR LDA #DUMMY
STA DATA,X ; wait for write cycle
LDA DATA,X ; to complete
CMP #$00
BEQ :ERROR
LDA SS,X
ORA #SS0
STA SS,X ; disable /CS
SEC ; an error occured
:IOERROR SEC ; an error occured
LDA #$27
RTS
BRA :DONE
:WPERROR SEC
LDA #$2B
BRA :DONE
********************************

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AppleIISd.s19
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7
README.md
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@ -8,14 +8,17 @@ A Xilinx CPLD is used as a SPI controller and translates, together with the ROM
The assembler sources were written in Merlin-8. The [schematics](AppleIISd.pdf) are available as PDF.
## Features
* up to 128MB storage space (4x 65535 blocks), currently 32MB
* up to 64MB storage space (2x 65535 blocks)
* ProDOS driver in ROM
* Auto boot
* Access LED
* Card detect and write protect sensing
## Requirements
The Apple][Sd requires and has been tested on an enhanced IIe computer. The ROM code uses some 65c02 opcodes and will therefore not work on a II, II+ or unenhanced IIe. ProDOS versions 1.1 to 2.4.1 seem to work.
When a 2732 type ROM is used, the binary image has to be programmed at offset 0x800, because A11 is always high for compatibility with 2716 type ROMs.
## Timing
The clock of the SPI bus *SCK* may be derived from either *Phi0* or the *7M* clock. Additionally, the divisor may be 2 to 8.
@ -52,8 +55,6 @@ LDA $C0C0
## TODOs
* Much more testing
* Support more than one partition
* Implement card detect and write protect sensing
* SRAM option (may never work, though)
* Find a use for the IRQ pin
* Use 28 pin socket to support other EPROMS than 2716 and 2732

1173
VHDL/appleiisd.jed
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