mirror of
https://github.com/garrettsworkshop/GR8RAM.git
synced 2024-12-12 08:30:08 +00:00
107 lines
2.2 KiB
Plaintext
107 lines
2.2 KiB
Plaintext
Addr Slinky GR8RAM
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0 RAMAddrL RAMAddrL
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1 RAMAddrM RAMAddrM
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2 RAMAddrH RAMAddrH
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3 Data Data
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4 AppleAddrL (TimerDMAEN)
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5 AppleAddrH (TimerDMAEN)
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6 DMALengthL (TimerDMAEN)
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7 DMALengthH (TimerDMAEN)
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8 Magic (reads 0x57, write command sequence)
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9 Ctl (TimerDMAEN)
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A Readout
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B
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C
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D
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E BankH (ExtBankEN)
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F Bank BankL
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Magic commands
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Set readout
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4 tick bytes
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config byte
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Write hidden control register
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Write IRQ period H
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Write IRQ period L
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Hidden control register
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(1) Enable timer & dma
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(1) enable extended bank
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(2) reserved
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(1) DR shift data bit
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(1) write '1' to shift bit into DR
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(1) write '1' to erase settings
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(1) write '1' to program settings
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Control register (TimerDMAEN)
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(1) Timer IRQ enabled
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(1) Timer IRQ flag
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(1) reserved
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(1) INTout
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(1) DMA Compare result
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(1) RAMAddrHH
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(2) DMA command (always reads 00)
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00 = no operation
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01 = read
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10 = write
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11 = compare
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Configuration Bits
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(1) Config word valid
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1 = invalid
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0 = valid
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(1) Slinky/RamFactor
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1 = RamFactor
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0 = Slinky
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(2) Driver number (BankCX) (0-3)
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(3) Capacity (invert bottom bit, then decode to get mask)
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111 = 011111 = 08192 kB
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110 = 111111 = 16384 kB
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101 = 000111 = 02048 kB
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100 = 001111 = 04096 kB
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011 = 000001 = 00512 kB
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010 = 000011 = 01024 kB
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001 = 000000 = 00256 kB
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000 = reserved
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Flash Memory Map (2 MB)
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-----------------------------
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3FF | |
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... | GS/OS Recovery (1.5 MB) |
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200 | |
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-----------------------------
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1FF | |
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... | ProDOS Recovery (256 kB) |
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180 | |
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-----------------------------
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07F | |
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... | Driver 3 (64 kB) |
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060 | |
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-----------------------------
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05F | |
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... | Driver 2 (64 kB) |
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040 | |
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-----------------------------
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03F | |
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... | Driver 1 (64 kB) |
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020 | |
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-----------------------------
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01F | |
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... | Driver 0 (64 kB) |
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000 | |
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|----------------------------
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SDRAM Memory Map (32 MB)
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1FFFFFF:1800000 RAMWorks copy
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17FFFFF:17F0000 64 kB main RAM copy
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17EFFFF:17E0000 64 kB driver (32 2048 byte banks)
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17DFFFF:1010000 Shared Memory (8064 kB)
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0FFFFFF:0800000 Extended RamFactor
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07FFFFF:0000000 8 MB RamFactor
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