bios

package

v0.8.1 Latest Latest Go to latest Published: May 7, 2026 License: GPL-3.0 Imports: 3 Imported by: 0

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Valid go.mod file
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Stable version
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Repository

github.com/jetsetilly/test7800

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Documentation ¶

Index ¶

Constants
Variables
type BIOS
- func NewNTSC() BIOS
- func NewPAL() BIOS
type Info

Constants ¶

View Source

const OriginBIOS = 0x8000

the addressing origin for the BIOS. the bios rom data will not be placed here unless the BIOS is 32k in length

the reason for this origin is given in the "7800 Software Guide" in the section detailing the INPTCTRL register and the EXT bit in particular:

"EXT: 0 = enable BIOS at $8000-$FFFF, 1 = disable BIOS / enable cartridge"

Variables ¶

View Source

var Supported map[string]Info = map[string]Info{
	"PAL": {Name: "PAL", MD5: "0x397bb566584be7b9764e7a68974c4263"},
	"NTSC": {Name: "NTSC", MD5: "0x0763f1ffb006ddbe32e52d497ee848ae",
		ChecksSignature: true, SignatureFail: 0x26c2, SignaturePass: 0x23f9},
}

list of supported BIOS along with MD5 and whether the BIOS cares about ROM signing

Functions ¶

This section is empty.

Types ¶

type BIOS ¶

type BIOS struct {
	// contains filtered or unexported fields
}

func NewNTSC ¶

func NewNTSC() BIOS

func NewPAL ¶

func NewPAL() BIOS

func (*BIOS) Access ¶

func (b *BIOS) Access(write bool, address uint16, data uint8) (uint8, error)

func (*BIOS) Label ¶

func (b *BIOS) Label() string

func (*BIOS) MD5 ¶ added in v0.6.1

func (b *BIOS) MD5() string

return MD5 sum of BIOS

func (*BIOS) Status ¶

func (b *BIOS) Status() string

func (*BIOS) String ¶ added in v0.4.3

func (b *BIOS) String() string

type Info ¶ added in v0.7.3

type Info struct {
	Name string
	MD5  string

	// whether the BIOS is known to check ROM signatures
	ChecksSignature bool

	// these two addresses are the insturction locations for the fail and pass conditions of the
	// signature check
	SignatureFail uint16
	SignaturePass uint16
}

Source Files ¶

View all Source files

bios.go

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