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view defs/cocosdc.d @ 3265:0c52f8d5302d
RAMMER Edition #5 Revision 3 updates:
1) Fixed /MD so that it works properly with 2 MB RAM systems.
2) Fixed signed math bug when >127 MMU blocks are assigned to a RAM drive. (maximum # of blocks in still 201)
3) Optimized 6809 sector read/write for speed.
| author | David Ladd <drencor-xeen@users.sourceforge.net> |
|---|---|
| date | Wed, 19 Jun 2019 18:21:55 -0500 |
| parents | 3afecdae6f53 |
| children |
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******************************************************************** * cocosdc.d - CoCo SDC definitions * * $Id$ * * Edt/Rev YYYY/MM/DD Modified by * Comment * ------------------------------------------------------------------ * 2014/05/02 Boisy G. Pitre * Created * 2014/12/22 Darren Atkinson * Additional hardware symbols IFNE COCOSDC.D-1 COCOSDC.D SET 1 * Main Port Address (V.PORT) SDAddr SET $FF4A * Hardware Addressing - CoCo Scheme CTRLATCH equ $FF40 controller latch (write) CMDREG equ $FF48 command register (write) STATREG equ $FF48 status register (read) PREG1 equ $FF49 param register 1 PREG2 equ $FF4A param register 2 PREG3 equ $FF4B param register 3 DATREGA equ PREG2 first data register DATREGB equ PREG3 second data register FLSHDAT equ $FF42 flash data register * Status Register Masks BUSY equ %00000001 set while a command is executing READY equ %00000010 set when ready for a data transfer FAILED equ %10000000 set on command failure * Command and Mode Values CMDMODE equ $43 control latch value to enable command mode CMDREAD equ $80 read logical sector CMDWRITE equ $A0 write logical sector CMDEX equ $C0 extended command CMDEXD equ $E0 extended command with data block ENDC