News for hackers. Stuff that matters.

A comment on Sonic the Hedgehog for Commodore 64/128 + REU. Parent comment

Re:Sonic the Hedgehog for Commodore 64/128 + REU by nigerian1981 on Monday December 13, 2021 @05:21PM (#29545434)
I believe this requires the RAM expansion unit
[ Parent | on HN ]
Re:Sonic the Hedgehog for Commodore 64/128 + REU by rasz on Monday December 13, 2021 @06:27PM (#29546123)
which has DMA capability http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/pr...

1) Transfer a block of data from main memory to expansion memory

2) Transfer a block of data from expansion memory to main memory

3) Exchange a block of main memory with a block of expansion

4) Verify a block of main memory with a block of expansion memory

copy is ~1MB/s compared to manual CPU speed of <120KB/s

[ Parent | on HN ]