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z80mbc2: add BLK support
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@ -8,7 +8,7 @@ Collapse OS on it rather simple.
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In this recipe, we're going to run Collapse OS on the Z80-MBC2, interfacing
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through its serial port. We're going to use the MBC's API to implement BLK on
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the SD card. (the BLK part isn't done yet. TODO)
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the SD card.
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### Gathering parts
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@ -25,6 +25,16 @@ Running `make` will yield `os.bin` which is what we want.
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Mount the SD card on your modern computer and copy `os.bin` as `autoboot.bin`,
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overwriting the binary that was previously there.
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We also have to copy the blkfs over. This is done by using IOS' drive system.
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Each `DSxNyy.DSK` file on the card is a drive, each drive has 512 track of 32
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sectors of 512 bytes, so one drive is plenty for our needs. Collapse OS
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hardcodes drive 0.
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Each drive is part of a set. IOS theoretically supports up to 10 sets, but the
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binary shipped by default only accepts 4. You have to overwrite an existing set.
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I used set 3. So, copy `blkfs` to file `DS3N00.DSK`. If you want, you can change
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the name of the set by changing the contents of `DS3NAM.DAT`.
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Put back the SD card in the Z80-MBC2 and power it up by connecting the FTDI
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adapter to it (red: VCC, black: GND, green: TX, white: RX).
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@ -34,7 +44,10 @@ the Z80-MBC2 appears to be hardcoded to 115200.
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Then, enable IOS program selection by holding RESET and USER at the same time,
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wait 2 seconds, releasing RESET, wait 2 seconds, releasing USER. You should then
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be given a 1-8 choice, with 4 being "Autoboot". Type 4.
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be given a 1-8 choice.
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You begin by selecting the proper disk set, which is through choice 8, then you
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select the Autoboot binary through choice 4.
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You are now in Collapse OS.
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@ -10,10 +10,30 @@ CODE (key)
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BEGIN, 1 INAn, A INCr, JRZ, AGAIN,
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A DECr, PUSHA,
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;CODE
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: _sel ( sec )
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( 32 sectors per track, 512 tracks per disk )
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32 /MOD ( addr sec trk )
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0x0a ( seltrk ) 1 PC! 0 PC! 0 0 PC! ( addr sec )
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0x0b ( selsec ) 1 PC! 0 PC! ( addr ) ;
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: _ ( addr )
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( get 512 bytes )
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0x86 ( readsec ) 1 PC!
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512 0 DO 0 PC@ SWAP C!+ LOOP DROP
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;
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: FD@ 2 * DUP _sel BLK( _ 1+ _sel BLK( 512 + _ ;
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: _ ( addr )
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( write 512 bytes )
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0x0c ( writesec ) 1 PC!
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512 0 DO C@+ 0 PC! LOOP DROP
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;
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: FD! 2 * DUP _sel BLK( _ 1+ _sel BLK( 512 + _ ;
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: FD$ ( select disk 0 )
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0x09 ( seldisk ) 1 PC! 0 0 PC! ( sel disk 0 )
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;
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380 LOAD ( xcomp core high )
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(entry) _
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( Update LATEST )
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PC ORG @ 8 + !
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," CURRENT @ HERE ! " EOT,
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," CURRENT @ HERE ! BLK$ FD$ ' FD@ BLK@* ! ' FD! BLK!* ! " EOT,
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ORG @ 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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