I have lots of those final acquisition moments all the timeintric8 wrote:I'll be posting more on this later, but my "final" hardware acquisition for the foreseeable future has just happened: ...
Oh dang this never occurred to me. I've been slammed at work and haven't had a chance to play with the D now that I've gotten it all set up. It beckons. But I was planning on using the Ultimate with it at some stage, but setting it to drive 9?I also did a mod on mine to add a switch to disable the internal drive so my Ultimate II can run on drive 8.
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CHANGING A DRIVE FROM DEVICE 8 TO DEVICE 9, 10, or 11 Latest additions & corrections: 9-11-2013 The internal 1571 in the metal case USA version C128DCR has no external switches for drive select. It is factory set for device #8. There are drive select "jumpers" inside the computer however, on the motherboard near the drive. They are the two tiny silver half-circles with a bar between them. Cutting the bar opens the jumper. If you look at the PC board just under the left side of the drive, you will see them. It is not necessary to remove the drive unless you plan to solder in there. The jumpers are located near ICs U106 (a 6522), U114 and U112. DS (drive select) jumper #1 is nearest to U112, towards the front of the computer. Electrically, the jumpers connect two pins of IC U106 VIA chip (65C22 or 6522 in some models) to chassis ground. Jumper 1 grounds pin 15 and jumper 2 grounds pin 16. That information is helpful just in case the foil pad(s) jumpers on the PC board are accidently damaged when you are installing a drive select switch. If the pads lift off the board, you can still make connections directly to the IC pins for your switch. The 1570 drive is not as common but is similar to the 1571 in that it uses the same board, will do burst-mode data transfers with the C128, and will do MFM as well as GCR disk encoding like the 1571. Since it has only one head, it uses SSDD disks like a 1541. It has no drive select switches but instead has internal jumpers. They are connected to VIA U9 pins 15 and 16. I have never seen a 1570, so my information about it is minimal.