108 lines
2.3 KiB
Go
108 lines
2.3 KiB
Go
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package izapple2
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import "fmt"
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/*
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See:
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https://github.com/bobbimanners/Applecorn
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http://beebwiki.mdfs.net/Category:MOS_API
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http://beebwiki.mdfs.net/OSBYTEs
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http://mdfs.net/Docs/Comp/BBC/Osbyte00
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*/
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type traceApplecorn struct {
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a *Apple2
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skipConsole bool
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osbyteNames [256]string
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}
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const (
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applecornMosVec uint16 = 0xffb9 // Start of the MOS entry points
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)
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func newTraceApplecorn(a *Apple2, skipConsole bool) *traceApplecorn {
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var t traceApplecorn
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t.a = a
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t.skipConsole = skipConsole
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t.osbyteNames[0x7c] = "clear escape condition"
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t.osbyteNames[0x7d] = "set escape condition"
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t.osbyteNames[0x7e] = "ack detection of ESC"
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t.osbyteNames[0x81] = "Read key with time lim"
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t.osbyteNames[0x82] = "read high order address"
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t.osbyteNames[0x83] = "read bottom of user mem"
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t.osbyteNames[0x84] = "read top of user mem"
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t.osbyteNames[0x85] = "top user mem for mode"
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t.osbyteNames[0x86] = "read cursor pos"
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t.osbyteNames[0xDA] = "clear VDU queue"
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return &t
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}
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func (t *traceApplecorn) inspect() {
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pc, _ := t.a.cpu.GetPCAndSP()
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if pc >= applecornMosVec {
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regA, regX, regY := t.a.cpu.GetAXY()
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s := ""
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if !t.skipConsole {
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switch pc {
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case 0xffe0:
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s = fmt.Sprintf("OSNEWL()")
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case 0xffc8:
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ch := ""
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if regA >= 0x20 && regA < 0x7f {
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ch = string(regA)
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}
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s = fmt.Sprintf("OSNWRCH(A=%02x, '%v')", regA, ch)
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case 0xffcb:
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s = fmt.Sprintf("OSNRDCH()")
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case 0xffe7:
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s = fmt.Sprintf("OSRDCH()")
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case 0xffee:
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ch := ""
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if regA >= 0x20 && regA < 0x7f {
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ch = string(regA)
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}
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s = fmt.Sprintf("OSWRCH(A=%02x, '%v')", regA, ch)
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}
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}
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switch pc {
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case 0xffb9:
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s = "OSDRM(?)"
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case 0xffbf:
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s = "OSEVEN(?)"
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case 0xffc2:
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s = "OSINIT(?)"
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case 0xffc5:
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s = "OSREAD(?)"
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case 0xffce:
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s = "OSFIND(?)"
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case 0xffd1:
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s = "OSGBPB(?)"
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case 0xffd4:
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s = "OSBPUT(?)"
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case 0xffd7:
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s = "OSBGET(?)"
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case 0xffda:
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s = "OSARGS(?)"
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case 0xffdd:
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s = "OSFILE(?)"
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case 0xffe3:
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s = "OSASCI(?)"
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case 0xfff1:
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s = fmt.Sprintf("OSWORD(A=%02x,XY=%04x)", regA, uint16(regX)<<8+uint16(regY))
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case 0xfff4:
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s = fmt.Sprintf("OSBYTE('%s';A=%02x,X=%02x,Y=%02x)", t.osbyteNames[regA], regA, regX, regY)
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case 0xfff7:
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s = "OSCLI(?)"
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}
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if s != "" {
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fmt.Printf("BBC MOS call to $%04x %s\n", pc, s)
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}
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}
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}
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