It might be covered by an FCO, see http://www.riscos.com/the_archive/acorn/fco/index.htm
FCO 2008 sounds like a likely candidate:
Sarah explains the differences in this thread: viewtopic.php?t=8593
Edit, actually the ArcWiki description gives more useful context: https://arcwiki.org.uk/index.php/MEMC1a
FCO 2008 sounds like a likely candidate:
Code:
A310, A440 2008 6th September 1989 FPA and SCSI MEMC1a requirementSounds like if you have a MEMC1A already, you're sorted. Checking the printing on the MEMC chip or the PAL label should be enough to tell whether that's the case.Purpose
To upgrade existing machines to include a MEMC1a memory controller. This is a necessary upgrade before fitting an Acorn SCSI and (A440 only) Floating Point expansion cards, and also increases performance generally by about 10%. The modification is not required on Archimedes 400/1 series, Acorn R140 or A3000 systems.
Parts Requiered
All Models:
· MEMC1a (part number 2201,375)
· MEMC1a PAL (0277,401)
Archimedes 440 only:
·33R (33W) resisitor (0502,330)
Sarah explains the differences in this thread: viewtopic.php?t=8593
Edit, actually the ArcWiki description gives more useful context: https://arcwiki.org.uk/index.php/MEMC1a
MEMC1a adds support for back-to-back IO cycles. This functionality is commonly used by SCSI and network podule drivers for fast data transfer.
Statistics: Posted by philpem — Wed Nov 13, 2024 11:03 am