3b1emu / changelog

[memory] Emulate main memory read wrap-around

• Fri, 18 Jan 2013 17:18:50 +0000
• by Philip Pemberton <philpem@philpem.me.uk> [Fri, 18 Jan 2013 17:18:50 +0000] rev 129
• [memory] Emulate main memory read wrap-around
  
  3B1s with 512K or 1MB of base memory have a decoding quirk which causes reads
  to 'wrap around'. That is to say, on a 512K machine, reading from addresses 0,
  512K, 1024K or 1536K will address the same RAM byte. On a 1MB machine,
  addresses 0 and 1024K address the same RAM byte.
  
  Emulating this incorrectly causes P4TEST to report an incorrect amount of
  available base RAM.

experimental memory mapper, not quite working experimental_memory_mapper_v2

• Fri, 18 Jan 2013 17:03:48 +0000
• by Philip Pemberton <philpem@philpem.me.uk> [Fri, 18 Jan 2013 17:03:48 +0000] rev 128
• experimental memory mapper, not quite working

fix default HDD sectors-per-track

• Wed, 16 Jan 2013 00:41:51 +0000
• by Philip Pemberton <philpem@philpem.me.uk> [Wed, 16 Jan 2013 00:41:51 +0000] rev 127
• fix default HDD sectors-per-track
  
  The 64MB Micropolis drive we're trying to emulate in FreeBee has 17 sectors
  per track. Fix this in main.c to avoid tripping the sector range checks.