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neo6502: Output .neo file format (#344) #345

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Jul 10, 2024
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neo6502: Output .neo file format (#344) #345

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17 changes: 16 additions & 1 deletion mos-platform/neo6502/link.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ ASSERT(__rc31 == 0x001f, "Inconsistent zero page map.")

MEMORY {
zp : ORIGIN = __rc31 + 1, LENGTH = 0x100 - (__rc31 + 1)
ram (rw) : ORIGIN = 0x0800, LENGTH = 0xf600 - 0x0800
ram (rw) : ORIGIN = 0x0200, LENGTH = 0xf600 - 0x0200
}

REGION_ALIAS("c_readonly", ram)
Expand All @@ -26,6 +26,21 @@ SECTIONS {
/* Set initial soft stack address to just above last memory address. (It grows down.) */
__stack = 0xf600;

/*
* .neo file format
* http://neo6502.com/reference/formats/#neo-load-file-format
*/
OUTPUT_FORMAT {
BYTE(0x03) /* magic cookie (not a valid 65c02 opcode) */
BYTE(0x4E) /* 'N' */
BYTE(0x45) /* 'E' */
BYTE(0x4F) /* 'O' */
BYTE(0x00) /* min version - major */
BYTE(0x00) /* min version - minor */
SHORT(_start) /* execute address */
BYTE(0x00) /* ctrl bits. bit 7=another block follows */
SHORT(ORIGIN(ram)) /* load address */
SHORT(__data_end - ORIGIN(ram)) /* size in bytes */
BYTE(0x00) /* string - comment, filename, whatever */
TRIM(ram)
}