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<\/a><\/p>\nQuite the same. I noticed that in my post I forgot to tell that I also have populated U702 (74F256) and U703 (74F646)\u00a0 \u00a0those are not needed for chipmem to work, but add them anyway.<\/p>\n
This is now a system that can start DiagROM via serialport.<\/p>\n
Time to get something on the display.
\nso we add Denise, U451 (74HCT244), U452 (74HCT244) and the Vidiot at HY450, text facing to the Amber socket.<\/p>\n
Now you will get something on the RGB port. (NOT the VGA one! that is for Part 3)<\/p>\n
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Anyway..\u00a0 next step is to get so<\/span>me fastmem.<\/span><\/p>\n You need to populate Ramsey, U891, U892, U893 and U894 (all 74F245) and the simmsockets. Put in 8MB simms, first in bank\u00a00\u00a0 then in bank 1.<\/span><\/p>\n now we have fastmem.<\/p>\n it is time to be able to control DiagROM and not just run and see.<\/p>\n of you looked on pictures you will see that U305 (1489) is already populated but I never mentioned it. so if you haven’t done it, put it there now.\u00a0 now you can receive data on the serialport aswell.<\/p>\n also add keyboardconnector, the 2 9pin Dsubs and populate U401 (74LS157):<\/p>\n Now you can control diagrom aswell.<\/p>\n Next step is audio…<\/p>\n Populate U402 (LF347) and put in the RCA Plugs.\u00a0 and to get Audio you need to populate C433 and C443 with 22uF capacitors) (and NO.. do NOT use ceramic caps where it should be electrolytes, they behave different and is voltagedependent so they have different capacitance at different voltages etc.. I will NOT help you if you put in tantals, ceramic or shit like that)<\/p>\n Anyway. now we have audio.<\/p>\n Time to get stuff for the floppy.<\/p>\n Populate U353 (74LS00), U351 (74LS74), U355 (74LS08) and the Even CIA, also put in the external floppy conector and the 32pin IDC for the internal floppy, and we got floppy working:<\/p>\n Now put in the SCSI\/Parallel connector:<\/p>\n Parallel port will now work.<\/p>\n Time for SCSI. remember the resistorpacks I told you not to populate. put in a female header for them here so you have a socket for the Terminationresistors:<\/p>\n now a sidenote about SCSI amd SCSI termination.<\/p>\n a SCSI chain must be terminated at Start and End of the cable, nothing more, nothing less.<\/p>\n so on the SCSI cable internally, the device on the outer end (physical, not ID number) should have termination, no other device.\u00a0 \u00a0and if you do not have a external device, you need termination on the motherboard (those headers you just put in)..\u00a0 \u00a0if you have external units, you should not have termination on the motherboard.\u00a0 See the whole chain as ONE cable and the motherboard is in the middle!..<\/p>\n so :\u00a0 <External cable>\u00a0 – <Motherboard> – <Internal cable>\u00a0 \u00a0 one termination at each end. So now add the SCSI Chip, DMAC and the 50 pin SCSI IDC:<\/p>\n <\/p>\n You shold now have workig SCSI (DiagROM sadly have no DiagROM test at the moment)<\/p>\n Time for some Zorro:<\/p>\n Add Buster and before you add the Zorro DB connector: as the area is tight, put in caps: C169, C173,C171,\u00a0 C175\u00a0 it is WAY more easy now.\u00a0 And solder in the Zorro DB Connectors:<\/p>\n Almost there.<\/p>\n Time for the RTC:<\/p>\n Populate U195 (74LS174), U190 (RP5C01) (I would recomend a socket for it), VC190 this is a trimmable capacitor will make another separate post about that. but generally 22pF is ok, wrong speed and clock drifts some), and also Y190 with a 32768Hz oscillator and the batterysocket. Remember that the ReAmiga does NOT support chargable batteries anymore:<\/p>\n
\nthere is a “whoopsie” here, the holes for the simmsocket plastic-rods are missaligned so you will need to cut the plastic on the simms.<\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n
\nso as we\u00a0 will not use a external cable. put in the resistors in those headers.\u00a0 \u00a0the dot (pin 1) facing to right here on picture.<\/p>\n<\/a><\/p>\n<\/a><\/p>\n