{"action":"created","issue":{"url":"https://api.github.com/repos/mamedev/mame/issues/3375","repository_url":"https://api.github.com/repos/mamedev/mame","labels_url":"https://api.github.com/repos/mamedev/mame/issues/3375/labels{/name}","comments_url":"https://api.github.com/repos/mamedev/mame/issues/3375/comments","events_url":"https://api.github.com/repos/mamedev/mame/issues/3375/events","html_url":"https://github.com/mamedev/mame/issues/3375","id":307653369,"number":3375,"title":"Xerox 820 disk format","user":{"login":"zx70","id":10224992,"avatar_url":"https://avatars1.githubusercontent.com/u/10224992?v=4","gravatar_id":"","url":"https://api.github.com/users/zx70","html_url":"https://github.com/zx70","followers_url":"https://api.github.com/users/zx70/followers","following_url":"https://api.github.com/users/zx70/following{/other_user}","gists_url":"https://api.github.com/users/zx70/gists{/gist_id}","starred_url":"https://api.github.com/users/zx70/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zx70/subscriptions","organizations_url":"https://api.github.com/users/zx70/orgs","repos_url":"https://api.github.com/users/zx70/repos","events_url":"https://api.github.com/users/zx70/events{/privacy}","received_events_url":"https://api.github.com/users/zx70/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":5,"created_at":"2018-03-22T13:54:46Z","updated_at":"2018-03-25T16:01:38Z","closed_at":"2018-03-25T16:01:38Z","author_association":"CONTRIBUTOR","body":"I recently tested the X820 implementation and I noticed that in the base configuration the Shugart SA-400 disk is configured to support 35 tracks only:\r\n\r\nstatic SLOT_INTERFACE_START( xerox820_floppies )\r\n\tSLOT_INTERFACE( \"sa400\", FLOPPY_525_SSSD_35T ) // Shugart SA-400\r\n        (...)\r\n\r\nThe odd thing is that all the SSSD disk images I could find online are for 40 tracks drives, and make MAME crash.\r\nThen I found \"Servicing your Personal Computer\" book:\r\n\"The first mini-floppy disk drive to gain popularity was the SA400 from Shugart Associates.  This 35 (or 40) track drive provides an unformatted capacity of 125K bytes in single density (...)\r\n\r\nI tried to rebuild MAME by changing the \"sa400\" configuration to FLOPPY_525_SSSD, and the disk images I could find work perfectly..    should it be an extra interface variant, an odd coincidence on all the disk images dumps, or simply a bug requiring to be fixed ?    Feeding the wrong disk format at the moment crashes MAME horribly..\r\n\r\n\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/mamedev/mame/issues/comments/375981350","html_url":"https://github.com/mamedev/mame/issues/3375#issuecomment-375981350","issue_url":"https://api.github.com/repos/mamedev/mame/issues/3375","id":375981350,"user":{"login":"zx70","id":10224992,"avatar_url":"https://avatars1.githubusercontent.com/u/10224992?v=4","gravatar_id":"","url":"https://api.github.com/users/zx70","html_url":"https://github.com/zx70","followers_url":"https://api.github.com/users/zx70/followers","following_url":"https://api.github.com/users/zx70/following{/other_user}","gists_url":"https://api.github.com/users/zx70/gists{/gist_id}","starred_url":"https://api.github.com/users/zx70/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zx70/subscriptions","organizations_url":"https://api.github.com/users/zx70/orgs","repos_url":"https://api.github.com/users/zx70/repos","events_url":"https://api.github.com/users/zx70/events{/privacy}","received_events_url":"https://api.github.com/users/zx70/received_events","type":"User","site_admin":false},"created_at":"2018-03-25T16:01:38Z","updated_at":"2018-03-25T16:01:38Z","author_association":"CONTRIBUTOR","body":"btw this issue as I opened it is solved"}}
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