2014-06-02 00:47:46 +00:00
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;ACME 0.95
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2013-05-12 22:17:06 +00:00
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!ifdef lib_cbm_c64_reu_a !eof
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lib_cbm_c64_reu_a = 1
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; This file contains definitions for accessing a RAM Expansion Unit (REU) of
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; type 1700, 1764, 1750 and compatible. These units contain a chip called REC
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; (RAM Expansion Controller) capable of direct memory access (DMA).
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; Standard base address of control registers is $df00 in i/o space.
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2014-06-02 00:47:46 +00:00
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!address {
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; status register
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rec_status = $df00 ; reading will clear IRQ, END and ERROR bits
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}
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rec_STATUS_IRQ = %#.......
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rec_STATUS_END = %.#......
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rec_STATUS_ERROR = %..#..... ; for verify command
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rec_STATUS_TYPE = %...#.... ; chip type (do not use to determine unit size!)
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rec_STATUS_VERSION = %....####
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!address {
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; command register
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rec_command = $df01
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}
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rec_COMMAND_EXECUTE = %#.......
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;reserved = %.#......
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rec_COMMAND_RELOAD = %..#.....
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rec_COMMAND_IMMEDIATELY = %...#.... ; do not wait for $ff00 write
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;reserved = %....##..
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rec_COMMAND_MODE_MASK = %......## ; bit mask for the four modes
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rec_COMMAND_MODE_STASH = %........ ; computer-to-REU
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rec_COMMAND_MODE_FETCH = %.......# ; REU-to-computer
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rec_COMMAND_MODE_SWAP = %......#. ; exchange
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rec_COMMAND_MODE_VERIFY = %......## ; compare
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rec_COMMAND_STASH = %#.#..... ; these wait for $ff00 before
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rec_COMMAND_FETCH = %#.#....# ; starting and then reload values.
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!address {
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; internal address (computer RAM)
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rec_int_low = $df02
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rec_int_high = $df03
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; external address (expansion RAM)
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rec_ext_low = $df04
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rec_ext_high = $df05
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rec_ext_bank = $df06
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2013-05-12 22:17:06 +00:00
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; A stock 1700 unit has two banks (128 KiB).
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; A stock 1764 unit has four banks (256 KiB).
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; A stock 1750 unit has eight banks (512 KiB).
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; Upgraded units and clones may have more, but the REC chip will always
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; "wrap around" after eight banks if crossing bank borders!
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2014-06-02 00:47:46 +00:00
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; amount of bytes to process
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rec_amount_low = $df07
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rec_amount_high = $df08
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; when to request interrupts
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rec_irqctrl = $df09
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}
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rec_IRQCTRL_ENABLE = %#.......
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rec_IRQCTRL_ON_END = %.#......
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rec_IRQCTRL_ON_ERROR = %..#..... ; for verify errors
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!address {
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; address control (set to zero for normal operation)
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rec_addrctrl = $df0a
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}
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rec_ADDRCTRL_FIX_INT = %#.......
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rec_ADDRCTRL_FIX_EXT = %.#......
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