(See below for jumpering Micro Technology diskette interface card to enable its bootstrap if required.)

A floppy drive bootstrap program has to exist in PROM on some Q-bus board. (It is not on the LSI-11/23 processor board.) The bootstrap program is a jumper option on the Micro Technology Inc. interface card, but is not provided on the DEC RX02 interface card. Therefore, to use the RX02, I had to get a couple of Q-bus cards on the used market that had the proper bootstrap PROM for the RX02 floppy drives.

The BDV11 board is 4-wide with a metal card edge, some LED lights, and a couple of card edge switches. The module number printed on the handle is M8012. It is a general purpose multiboot PROM board with bus terminators, diagnostic lights, and HALT and RESTART switches. Besides the RX02/01 bootstraps, the board has PROM boots for a number of obsolete operating systems and storage devices, plus the ability to code your own bootstrap in the obsolete PROM of your choice. We use the RX02 bootstrap for the LSI-11/23 computer and the RX01 bootstrap for the SuperTech LSI-11 computer. The BDV11 board in the SuperTech computer is the spare for the on-line system. If needed for that purpose, it will have to be re-jumpered as described below.

The BDV11 is placed at or near the last slot of the backplane. It needs no DMA or interrupt continuity. In the LSI-11/23 system, it is in the second to the last slot because of crowding with a bus cable in the last slot.

There are two DIP switch modules on the board, an 8-switch bank (E15) in the upper right and a 5-switch bank (E21) lower to the left, seen while holding the board with the metal top edge upright. These switches are to be set as follows. Note that OPEN means OFF and CLOSED means ON.

E15: Switches 6 & 7 on, all others off. These specify RX02 bootstrap. (Only Switch 6 on for RX01.)

E21: All 5 switches off. Switch 5 enables the on-board line time clock. We want it disabled, so it won't interfere with our rubidium 50-hz clock frequency.

These switches should both be to the RIGHT, as marked on the card edge.

The left switch is halt/enable. In the right position the computer runs normally, in the left position ODT is invoked. This duplicates the halt switch we have on the panel on the front of the drawer.

The right switch restarts the computer. Cycle the switch to the left and right to reboot. This duplicates the boot switch on the front panel.

After booting, all four red lights should be off, indicating no error. The green light indicates normal 12V and 5V power supply voltages.

If a pattern of red lights shows, look up the cause in Table 8 on P. 107 of the "Microcomputer Interfaces Handbook", 1980.

If it is necessary to pull the BDV11, you can't boot the DEC RX02 floppy drives. You have to revert to the backup Micro Technology drives. Also, you will have to jumper the MicroTech interface card to enable its bootstrap program.

There are two blue jumpers in the middle of the MicroTech card. To enable the on-board bootstrap, move the left blue jumper (top edge up) from pins 42-43, the boot disabled position, to 41-42, the boot enabled position. The jumper will be on a diagonal in this position.

Proceed to bring up the MicroTech drives as detailed in the Floppy Disk Drives write-up.