6502/erc-c
1
0
Fork 0
mirror of https://github.com/pevans/erc-c.git synced 2024-06-25 12:29:34 +00:00
Code Issues Projects Releases Wiki Activity

Document the gcr62 table

Browse Source
This commit is contained in:
Peter Evans 2018-02-12 21:19:47 -06:00
parent ec522f259e
commit 5b1298bded
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/apple2.enc.c
View File

@ -15,6 +15,14 @@
#include "apple2.dd.h"
#include "vm_segment.h"
/*
* This is the table that holds the bytes that represent 6-and-2 encoded
* data. Note the table goes from $00..$3F; that is the amount of values
* that six bits can hold. Each of those six-bit combinations maps to a
* different byte value that would be literally written to and read from
* the disk media. Apple II's RWTS subroutine would then translate them
* back into data that is useful to the software being run.
*/
static vm_8bit gcr62[] = {
// 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
0x96, 0x97, 0x9a, 0x9b, 0x9d, 0x9e, 0x9f, 0xa6, 0xa7, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb2, 0xb3,