mirror of
https://github.com/uffejakobsen/acme.git
synced 2024-11-26 15:49:18 +00:00
d152f60acd
git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@34 4df02467-bbd4-4a76-a152-e7ce94205b78
64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
;ACME 0.95
|
|
|
|
!ifdef lib_cbm_c64_reu_a !eof
|
|
lib_cbm_c64_reu_a = 1
|
|
|
|
; This file contains definitions for accessing a RAM Expansion Unit (REU) of
|
|
; type 1700, 1764, 1750 and compatible. These units contain a chip called REC
|
|
; (RAM Expansion Controller) capable of direct memory access (DMA).
|
|
; Standard base address of control registers is $df00 in i/o space.
|
|
|
|
!address {
|
|
; status register
|
|
rec_status = $df00 ; reading will clear IRQ, END and ERROR bits
|
|
}
|
|
rec_STATUS_IRQ = %#.......
|
|
rec_STATUS_END = %.#......
|
|
rec_STATUS_ERROR = %..#..... ; for verify command
|
|
rec_STATUS_TYPE = %...#.... ; chip type (do not use to determine unit size!)
|
|
rec_STATUS_VERSION = %....####
|
|
!address {
|
|
; command register
|
|
rec_command = $df01
|
|
}
|
|
rec_COMMAND_EXECUTE = %#.......
|
|
;reserved = %.#......
|
|
rec_COMMAND_RELOAD = %..#.....
|
|
rec_COMMAND_IMMEDIATELY = %...#.... ; do not wait for $ff00 write
|
|
;reserved = %....##..
|
|
rec_COMMAND_MODE_MASK = %......## ; bit mask for the four modes
|
|
rec_COMMAND_MODE_STASH = %........ ; computer-to-REU
|
|
rec_COMMAND_MODE_FETCH = %.......# ; REU-to-computer
|
|
rec_COMMAND_MODE_SWAP = %......#. ; exchange
|
|
rec_COMMAND_MODE_VERIFY = %......## ; compare
|
|
rec_COMMAND_STASH = %#.#..... ; these wait for $ff00 before
|
|
rec_COMMAND_FETCH = %#.#....# ; starting and then reload values.
|
|
!address {
|
|
; internal address (computer RAM)
|
|
rec_int_low = $df02
|
|
rec_int_high = $df03
|
|
; external address (expansion RAM)
|
|
rec_ext_low = $df04
|
|
rec_ext_high = $df05
|
|
rec_ext_bank = $df06
|
|
; A stock 1700 unit has two banks (128 KiB).
|
|
; A stock 1764 unit has four banks (256 KiB).
|
|
; A stock 1750 unit has eight banks (512 KiB).
|
|
; Upgraded units and clones may have more, but the REC chip will always
|
|
; "wrap around" after eight banks if crossing bank borders!
|
|
; amount of bytes to process
|
|
rec_amount_low = $df07
|
|
rec_amount_high = $df08
|
|
; when to request interrupts
|
|
rec_irqctrl = $df09
|
|
}
|
|
rec_IRQCTRL_ENABLE = %#.......
|
|
rec_IRQCTRL_ON_END = %.#......
|
|
rec_IRQCTRL_ON_ERROR = %..#..... ; for verify errors
|
|
!address {
|
|
; address control (set to zero for normal operation)
|
|
rec_addrctrl = $df0a
|
|
}
|
|
rec_ADDRCTRL_FIX_INT = %#.......
|
|
rec_ADDRCTRL_FIX_EXT = %.#......
|