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Board layout, gerbers and scans are now on GitHub: https://github.com/max234252/MacPlus-Reloaded As with my other designs these are provided under a non-commercial licence but if you are a repairer and want to offer transplant services (or have any other commercial use in mind) please contact...

Board layout, gerbers and scans are now on GitHub: https://github.com/max234252/MacIIcx_Reloaded As with my other designs these are provided under a non-commercial licence but if you are a repairer and want to offer transplant services (or have any other commercial use in mind) please contact...

The LC II doesn't have a scsi termpower fuse however it is conceivable if shorted the diode at D1 (Just below the external scsi connector) could be damaged so it might be worth checking that if your heaving termpower issues

I have confirmed modern LCD's with the HD44780 compatible controllers do work fine on the techstep :) I thought I had posted that in this thread but I guess not... Must have only mentioned it in PM's with @jajan547 Here is the techstep working with a modern backlit LCD (Which looks much...

From some old threads it seems the AM29LV040B, PM39LV040 or MX29LV040 are the only supported chips by the stock formware though I can't say I ever tried it on one of the SST chips

Really? I thought all the supported chips where 3.3v? The SST39SF0x0 series are all 5v chips (the LF are the 3.3v ones) EDIT: Haveing dug through some old threads it looks like the AM29LV040B, PM39LV040 or MX29LV040 are the only supported chips by the stock firmware I'll try it tomorrow, my...

Just tried it, seems to work fine :) Booted my 8600 into 8.6 from a SATA HDD from a card which now has a SST39SF040 installed

Will do, I have a bunch of SST39SF040's so i'll give it a try with one of those :)

Much progress has been made since the my last post to this thread! Stage 2 is now more or less complete, All the hardware has been reverse engineered and new boards have been drawn up and sent off for manufacture. A quick overview of the current status of the hardware: Logicboard: Port...

When creating straight copies of PCB's I generally favour Sprint layout, it allows you to import scans and trace over them and once you get used to it it is quick and easy to use however it has a couple of drawbacks - it dosen't create any kind of netlist or have any schematic tied to the design...

Yep, it only grounds the odd pins on the the connector

Glad to hear you got it working :)

D1 is part of the power supply circuit for the EGRET so is not the cause of your issue D3 is the one which generates term power (it's up by the external SCSI connector) it your BlueSCSI works on a externally it must be working so it seems likely you have a trace break between the internal and...

Can confirm the 87 and 88 both work - I have used a 88 in a SE and a 87 in a IIcx (using a little QFN to PLCC adapter board I made) both of which worked perfectly

A quick note for anyone who might have had one of these boards made: I have discovered a error in the layout which stops accelerator cards form working in these boards (And possibly PDS cards that try to do DMA), there is a resistor on /BR of the onboard CPU that should be a pull down but is...

My plus dose this, but the drive doesn't do it in another mac suggesting this is a logicboard issue (unless the fact I tested it on a SWIM based mac makes a difference) I can also say that it has intermittently done this since the late 80's / early 90's - the Plus had this issue when my dad...