Mem+
NOTE: production rev2.0 Mem+ PCB’s are now available; I will be updating this product page RSN. Due to additional components required for the new features the kit and assembled and tested prices will be increased.
Mem+ board:
- Four sockets for 512KB memory chips for 2MB per board
- Jumper for selecting board address range ($000000-$1FFFFF,$200000-$3FFFFF,$400000-$5FFFFF,$600000-$7FFFFF)
- raises PropPlug compatible programming pins for CPU #1 to Mem+ for easy access
- ONE of the Mem+ boards installed in a stack may implement one or more of the following optional features
- MAX3232 based serial port / programming port
- optional RESET transistor
- disable reset jumper
- selectable DTR/RTS for reset
- DB9 PCB mount footprint
- CP23S17 SPI I/O expander
- uses four available pins of CPU#1
- 16 parallel I/O’s brought out to 2×5 ten pin headers with GND and 3.3V
- may be used for Atari/Sega style joysticks
- SD card interface, uses other four available pins of CPU#1
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Mem+ Parts list with PCB placement
More on the memory and bus design:
- 24 bit addressing
- page address is latched from P0-P15 when P26&27 are both pulled low
- P26 is ~RD
- P27 is ~WR
Memory Map:
- addresses $000000-$07FFFF reserved for memory mapped I/O
- on-board 512K ram addressed at $200000-$27FFFF, but “mirrored” thru $37FFFF
- $400000-$5FFFFF nominally for first Mem+ board
- $600000-$7FFFFF nominally for second Mem+ board
PLEASE NOTE:
You can have 7.5MB of memory in your Morpheus Stack by using four Mem+ boards as follows:
- select address range starting at $000000 for the first Mem+ board
- DO NOT POPULATE first socket as its address space is used for I/O
- populate remaining three sockets on that board
- select address range starting at $200000 for the second Mem+ board
- remove the 512KB memory chip from Morpheus, populate all four memory sockets on second board
- select address range starting at $400000, populate all four sockets
- select address range starting at $600000, populate all four sockets
A second view:
