Things are tough right now ...

They're tough for everyone :( But when coronavirus hit here in the UK, the museum had to close its doors to the public, and we lost practically all our income overnight.

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

      Twitch  Facebook          Online Gift Shop      

Thank you.

Acorn MEMC Datasheet

The Memory Controller MEMC datasheet has 74 illustrated pages
Part number 0460,019 Issue 1.0
30th September 1986

The Memory Controller (MEMC) acts as thc interface between the ARM (Acorn RISC Machine) processor,
Video Controller (VIDC), I/O Controllers (including IOC), memories (ROM) and Dynamic
memory devices (DRAM), providing all the critical system timing signals.

Up to 4MBytes of DRAM may be connected to MEMC, which provides all signals and refresh operations
for a wide variety of standard DRAMs. A Logical to Physical Address Translator maps the Physical
memory into a 32MBylc Logical address space (with three levels of protection) allowing Virtual Memory
and Multi-Tasking operations zo be implemented. Fast "page modo" DRAM acccsscs are used to maximise
memory bandwidth.

MEMC supports Direct Memory Access (DMA) read opcralions with a set of programmable DMA Address
Generators, which provide a circular buffer for Video data, a linear buffer for Cursor data, and multiple
buffers for Sound dum.


Reference Number :

Date Published : 30th September 1986

Manufacturer : Acorn

Platform : MEMC

 

 

 

 

 

This exhibit has a reference ID of CH29468. Please quote this reference ID in any communication with the Centre for Computing History.
 

Acorn MEMC Datasheet

Click on the Images For Detail






Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum