Baker Whopper Memos

To: Lisa 1.75-Meeting Attendee$ From: Paul Baker Date: May 26, 198~ Stbject: Minutes of ?15/l~3 rreet1ng cc: IJJ. Rosing The following issues were discussed at the Lisa 1.75 rreeting on May 5, 1~83: 1 - Next Meeting would. be• 5/26., sane time sane place . .• i . 2 - The ERS was discussed.. clari ficatiqn -on the: lack of battery backup was · suggested, it will be adde~d in the third draft. More discussion of the ERS fallows below. . 3 - The operating assurrpti.on for the design is that the current apps and bigh level OS parts will work oin both machines without changes. "' to discuss the Widget/l.75 interface was formed . . minutes of 4 - A working group the first meeting are attaiched.. · s - The location of the serial nunt>er is still .an open issue. 6 - The cornnent was made that due to the fact that the 68K 1s doing the rroto~ stepping, it is 1f1llortant to service the Timer 1 interrupt pro~~ly. 7~- A question was raised regarding parity checking on OMA. In addition some questions were asked about the use of the two new expansion slots. The new ERS addresses these issues. a·- Questions were asked aJoout the COPS/NMI/Reset ideas. The new ERS addresses this issue. · 9 - The twiggy use light 'is still an issue. 10 - Issues of corrpat1b111ty between Lisa 1 and Lisa l.75 I/O expansion cards were raised. Engineering conmitted to writ-e an application note so designers caulcl design cards that will work 1n both systems. 11 - Service indicated that they would like nDckups to evaluate servicability aspects of the system and that they would like to be involved in production philosophy discussions. S•~rvice indicated that ·they also need a PIP so they can scheaule their activ1t1es.· They indicated that they would need schematics by 7/28, 2 systems with socketed C°""30nents by 10/~8 and 3 final systems by 11/28. 12 - A remaining open issue~ is ~he relationship .between Lisa 1. 75 and the file server. · • I ii; •/I To: Ken Okin · From: Paul Baker Date: May 6, 1983 SUbject: First Widget t1eet1ng minutes cc: w. Dirks, R. Mohme G. Marten, B .' Lee, llL Henry, O. Offen, M. Urqhart, C. Twyman The first Widget/Lisa 1.75 meet1ng·was held May Sand the following issues were raised: 1 - Current status is: 30 drives on test using 16 sector controller, about 70 drives total have been ttuilt, build rate is now about 50/roonth, going to 100/roonth soon, 500/roonth in August and 3000/roonth (maybe) in October. The nineteen sector controller is working now, still waiting for ECC gate array, still waiting for seconcl pass main gate array. We can expect a working drive/controller with f].rmware on 7/1. 2 - The drive was desigrted with performance in mind, average access is 55 ms vs 180 ms on the Seagate,. track to track is 7 ms vs 20ms. Latency is higher at 19 ms max vs 16 ms. The delta rate is 5 'MHz. The 20 MB widget will have higher latency of about 25 ms max and a slightly higher data rate of about 6.5 MHz. The 40 MB widget will helVe still higher latenc…