I don’t think it is as sophisticated as what you are talking about with a hypervisor, but it is clearly performing some kind of MITM on I/O calls and then executing I/O at its native speed. There is probably a fair amount of magic in there that is irrelevant to this discussion since it facilitates compatibility when running at higher than stock CPU clocks. It does make me wonder though if a somewhat less complicated solution with a microcontroller piggybacked onto the kernal ROM (and presumably on the 1541 side) might make this kind of DMA-like performance possible without breaking compatibility. I’d guess the cost might quickly approach that of a U64, but it would be the more purist approach with original hardware, and U64’s are more or less unobtanium new at the moment. Justin > On Mar 30, 2022, at 12:29, Jim Brain <brain_at_jbrain.com> wrote: > > On 3/30/2022 12:00 PM, Justin wrote: >> Isn’t this kind of how the super speed kernal as implemented in the U64 works? > > Most likely. I am not as familiar with all of the U64 features, but if I can conceive it, Gideon can as well. > > Jim > --Apple-Mail=_93148FCD-9C74-484D-8FA9-3DC8F1D8B6D4 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCCd4w ggS8MIIDpKADAgECAhB4SqkSGNGkJghRPNNmVUOjMA0GCSqGSIb3DQEBCwUAMEwxIDAeBgNVBAsT F0dsb2JhbFNpZ24gUm9vdCBDQSAtIFIzMRMwEQYDVQQKEwpHbG9iYWxTaWduMRMwEQYDVQQDEwpH bG9iYWxTaWduMB4XDTIwMDkxNjAwMDAwMFoXDTI5MDMxODAwMDAwMFowWzELMAkGA1UEBhMCQkUx GTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExMTAvBgNVBAMTKEdsb2JhbFNpZ24gR0NDIFIzIFBl cnNvbmFsU2lnbiAxIENBIDIwMjAwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC/G8kG oRqlq7Hb/Pcnt8WyVE5aMpUnmsIx9YayDXt2YPs1KcbtKmhrx3eG1eyWzUgzGg7w/Ki5BqM1Cpia VijGKeWp6cw2/sInIQow4C2CUGYPoL9ALuRP51LHgd9JOzzGa/y94k6V0zMXxL8ESf+0PjD8O+mD 6hc6oPI6Ic9NpxEUrRAeirl4RsGZVLxbSvBxpGi0718ZMD42MXQzLsYtE0rR4w8aHaFw9lRFCFfL vBFDxcUh8QDqRpAcc3badydW3CqJOYDBNH7gY01WKcbcqM1ksBVKcat0K9PYjhmjX2ErLk9fqjvC tVe8xHjNXlUEXBXpkMz7F7Bqjsy6n5JvAgMBAAGjggGJMIIBhTAOBgNVHQ8BAf8EBAMCAYYwHQYD VR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUFBwMEMBIGA1UdEwEB/wQIMAYBAf8CAQAwHQYDVR0OBBYE FIW78MzENrUKYnajmS6PuzpqrcVRMB8GA1UdIwQYMBaAFI/wS3+oLkUkrk1Q+mOai97i3Ru8MHoG CCsGAQUFBwEBBG4wbDAtBggrBgEFBQcwAYYhaHR0cDovL29jc3AuZ2xvYmFsc2lnbi5jb20vcm9v dHIzMDsGCCsGAQUFBzAChi9odHRwOi8vc2VjdXJlLmdsb2JhbHNpZ24uY29tL2NhY2VydC9yb290 LXIzLmNydDA2BgNVHR8ELzAtMCugKaAnhiVodHRwOi8vY3JsLmdsb2JhbHNpZ24uY29tL3Jvb3Qt cjMuY3JsMEwGA1UdIARFMEMwQQYJKwYBBAGgMgEoMDQwMgYIKwYBBQUHAgEWJmh0dHBzOi8vd3d3 Lmdsb2JhbHNpZ24uY29tL3JlcG9zaXRvcnkvMA0GCSqGSIb3DQEBCwUAA4IBAQBZa2qO7XaDnbgV 0PYfBRdTWtLF4zlpJTVxQLVX/EGNdbQiMDv/f+8bZyJ6088/+DeWmhB49UmlAApmaXzV8fA8+K8U r0lrjWMmSCobOQ5FILTFiSHaAZ5CDUlVoLNytHMkSVGNPjjaboWlsscJ5vEgcu7RYE2Mtmt4Hoxg xqp08voi1te0P8FTiTnXtwS5RtzOgEVkCtqOruhQFZe6uiWfkAydHBU3CAk3g2nSziSQn3gp6nNs U4vNxud9QHT7FPh+heZszQaaZw8Y7LSq+oQcmwHANlcPEiTyioKecueCLs33hKfh5Nyaln00fZ0M 3U5MQ9VeBEblfWkFw20xYbowMIIFGjCCBAKgAwIBAgIMEiM26p4/9crpWJ71MA0GCSqGSIb3DQEB CwUAMFsxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhH bG9iYWxTaWduIEdDQyBSMyBQZXJzb25hbFNpZ24gMSBDQSAyMDIwMB4XDTIyMDMwMzE2NDgxMVoX DTI1MDMwMzE2NDgxMVowUjEkMCIGA1UEAwwbc2hhZG93QGRhcmtzaWRlcmVzZWFyY2guY29tMSow KAYJKoZIhvcNAQkBFhtzaGFkb3dAZGFya3NpZGVyZXNlYXJjaC5jb20wggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQCpDw8r9zMnSlgxpu4NudC4Xen655R9MLWZhJqrOiqhYNNFCvw4lTrt 5qXwLesOdZNduVB8eVIQXRaXEmgYhYI4bCI2eDxqY7/ueYF9ZgLxfYgyIYC2OCDXeuxF0WxyfOxP 7ViDtGJ/NrpIGszmZzGZYl2IBKwg8Ejvyh0DRPEqCjql8u34pLIQ5Z8Bx8ju3xVznYhZ3yr9nMrM wJwUdUsdKKSODHR1VpPxtOM+Gr31W00DptMVbErgcn/8L+lXHn3pu16PJgJ/PJW9MVVY256hRgoK CeEBCrFKKPQmLVyadDXxOYiqydJpDBhw2+m6ek9CpkRPF/cO4Q+217BvaHSJAgMBAAGjggHlMIIB 4TAOBgNVHQ8BAf8EBAMCBaAwgaMGCCsGAQUFBwEBBIGWMIGTME4GCCsGAQUFBzAChkJodHRwOi8v c2VjdXJlLmdsb2JhbHNpZ24uY29tL2NhY2VydC9nc2djY3IzcGVyc29uYWxzaWduMWNhMjAyMC5j cnQwQQYIKwYBBQUHMAGGNWh0dHA6Ly9vY3NwLmdsb2JhbHNpZ24uY29tL2dzZ2NjcjNwZXJzb25h bHNpZ24xY2EyMDIwMEwGA1UdIARFMEMwQQYJKwYBBAGgMgEoMDQwMgYIKwYBBQUHAgEWJmh0dHBz Oi8vd3d3Lmdsb2JhbHNpZ24uY29tL3JlcG9zaXRvcnkvMAkGA1UdEwQCMAAwSQYDVR0fBEIwQDA+ oDygOoY4aHR0cDovL2NybC5nbG9iYWxzaWduLmNvbS9nc2djY3IzcGVyc29uYWxzaWduMWNhMjAy MC5jcmwwJgYDVR0RBB8wHYEbc2hhZG93QGRhcmtzaWRlcmVzZWFyY2guY29tMB0GA1UdJQQWMBQG CCsGAQUFBwMCBggrBgEFBQcDBDAfBgNVHSMEGDAWgBSFu/DMxDa1CmJ2o5kuj7s6aq3FUTAdBgNV HQ4EFgQU4BKQGKnyXl/XjjK4orSOLatZk4wwDQYJKoZIhvcNAQELBQADggEBAB8gLjJ+duwBY3lt bu6chBwTKZErjKJzSyfT4OZED21OfJKPB2PIGSkUcEcwfspnKSwNQdLNKreCDaQ5TlpX2deiEfKz iqlIa+QdSUHhbQbX0XPkWf3v3PKuMegowX0V20uku8I1WXZc3O+g99UomtY3MkAstlffGysH0sDl oJ+ZQqcDAZFmB5uzzWscUeQHUazlbjIocMNNu5edOhRlUKZyOzXrjhEyIWgdPz8qEaTBdVsKmVH4 UUxQi9jIrOylV97J+h0mKqA8O8J+DdcJPImHOw4Od7Iz//ChyumaTRCsQ/86FSQy1BsnfOCwKrTc x5orjhNSJ02uOpjwIKeb7gkxggL9MIIC+QIBATBrMFsxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBH bG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBSMyBQZXJzb25hbFNpZ24g MSBDQSAyMDIwAgwSIzbqnj/1yulYnvUwDQYJYIZIAWUDBAIBBQCgggFjMBgGCSqGSIb3DQEJAzEL BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTIyMDMzMDE3MzkwMlowLwYJKoZIhvcNAQkEMSIE IEGZBeD4SyDLTlj8i//2Zx1lxAhypyNZRtROIIA0PZw4MHoGCSsGAQQBgjcQBDFtMGswWzELMAkG A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExMTAvBgNVBAMTKEdsb2JhbFNpZ24g R0NDIFIzIFBlcnNvbmFsU2lnbiAxIENBIDIwMjACDBIjNuqeP/XK6Vie9TB8BgsqhkiG9w0BCRAC CzFtoGswWzELMAkGA1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExMTAvBgNVBAMT KEdsb2JhbFNpZ24gR0NDIFIzIFBlcnNvbmFsU2lnbiAxIENBIDIwMjACDBIjNuqeP/XK6Vie9TAN BgkqhkiG9w0BAQsFAASCAQCQlpAPQCMsmJnt79jaRx0LPKLCtS77aN9YoFmb45s11lx45YXl4LIT Y8m6v6uakbTXBpptwcKIqMhm2+b8NNQz0KTSIkVLhPFNmncYBy2ntXl58vJFr9k6VBqUKttkn5zB m4vP0YbfEaozaOdpyTvbdMthX8Q+Mvwa347kctX4XJtqNR6L9g2iE5TYgti0KuRzXsLM3b9Wg81s oU4MnBtMS/jzxyjYxneMfw3cbaj19jC3ArXEMlUnEjjQ71M29fDo7BlHrl5s1hCa1IKIzi1B62Ib /kGjBvStP8Ui9xfmX0KwMLiCtIe17kwJZom7fj94fAqe3v13tmv81xczCK5fAAAAAAAA --Apple-Mail=_93148FCD-9C74-484D-8FA9-3DC8F1D8B6D4--Received on 2022-03-30 20:00:48
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