mikeoro@hubcap.clemson.edu (Michael K O'Rourke) (07/01/89)
Does anyone know what would cause a DDPWrite to fail, giving an errcode of -95 which corresponds to excessCollns? I don't understand what the errcode really means. It seems like it is saying i have to many writes queued up, but that is not possible because i only have one write queued up. Also, has anyone experienced problems with NBP/ATP code working fine on 68000 machines, but failing when run on a 68020 or 68030 machine. I have an appletalk communications package i am developing and just run it on MacII and SE30, only to find it crashes those machines. Is there some trick to AppleTalk on those machines? Thanx, Michael O'Rourke
paul@taniwha.UUCP (Paul Campbell) (07/02/89)
In article <5889@hubcap.clemson.edu> mikeoro@hubcap.clemson.edu (Michael K O'Rourke) writes: >Does anyone know what would cause a DDPWrite to fail, giving an errcode of >-95 which corresponds to excessCollns? I don't understand what the errcode >really means. It seems like it is saying i have to many writes queued up, >but that is not possible because i only have one write queued up. This actually ought to happen every so often (well not that often - it depends on how busy your net is) - it's telling you that it tried to send the packet a number of times and each time it got a collision with another packet on the net from another machine. This sort of thing is statistical DDP is not reliable and you're supposed to lose some packets (the protocol you are running on top of DDP handles this, right? :-). In practice if you get this back a lot it probably means a net with problems, either it's noisy (wrapped around a fluorescent light or AM radio station or something), or badly terminated (a phonenet like system without the terminating resistors in the correct place, or a LocalTalk system with a long run with no box at the end), or there is another system on the net which is doing something wierd. Paul -- Paul Campbell UUCP: ..!mtxinu!taniwha!paul AppleLink: D3213 "Free Market": n. (colloq.) a primitive fertility goddess worshipped by an obscure cult in the late 20th C. It's chief priest 'Dow Jones' was eventually lynched by an enraged populace during an economic downturn (early 21st C).