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New Electron AP5 - 2nd Batch

Posted: Thu Mar 26, 2020 1:43 pm
by daveejhitchins
I'm getting ready for a 2nd batch of the redesigned AP5.

So far, just two changes:
(1) Added a power connector for an optional BeebSCSI
(2) Moved the pull-down resistor from data line 0 on the 1MHz connector to data 0 on the Tube connector.

If anyone has any other changes that 'could' be added quickly (?) please post here.

Thanks - Dave H :D

Re: New Electron AP5 - 2nd Batch

Posted: Thu Mar 26, 2020 10:29 pm
by mr-macrisc
Looking forward to getting one :)

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 6:35 am
by 0xC0DE
mr-macrisc wrote:
Thu Mar 26, 2020 10:29 pm
Looking forward to getting one :)
Same here. Count me in please

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 7:29 am
by rmbrowngr
Jumper to disable ROM 13? To save pulling out the ROM chip.

More convient location for the power connector used for the BeebSCSI.

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 7:38 am
by daveejhitchins
rmbrowngr wrote:
Fri Mar 27, 2020 7:29 am
Jumper to disable ROM 13? To save pulling out the ROM chip.

More convient location for the power connector used for the BeebSCSI.
Richard - good call on the ROM13 - I’ll see what can be done.

Currently I have the 5V connector on the back. So would moving it to the front - is that what you’re after?

Dave H :D

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 7:44 am
by rmbrowngr
daveejhitchins wrote:
Fri Mar 27, 2020 7:38 am
Currently I have the 5V connector on the back. So would moving it to the front - is that what you’re after?
Yes, moving it to the front.

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 7:46 am
by daveejhitchins
rmbrowngr wrote:
Fri Mar 27, 2020 7:44 am
daveejhitchins wrote:
Fri Mar 27, 2020 7:38 am
Currently I have the 5V connector on the back. So would moving it to the front - is that what you’re after?
Yes, moving it to the front.
I'll work on that . . .

Dave H :D

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 9:54 am
by dixiestoat
You can't improve on a Masterpiece.... :D

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 11:58 am
by daveejhitchins
dixiestoat wrote:
Fri Mar 27, 2020 9:54 am
You can't improve on a Masterpiece.... :D
Well . . . It look as if you can :D Connector moved to the top of the PCB and we have a spare jumper (J3) that can be used to disable ROM 13.

Dave H :D

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 1:15 pm
by daveejhitchins
Here's an image of the changes. Note: A reprogram of the CPLD will add the ROM 13 inhibit, for those that want it.

Capture.JPG

Dave H :D

Re: New Electron AP5 - 2nd Batch

Posted: Fri Mar 27, 2020 3:56 pm
by daveejhitchins
Well . . . That didn't take long! An updated .jed file is available here with thanks to Dave (Hoglet) for such a speedy change =D>

If you are going to reprogram you AP5 CPLD than you may need to fit a 2 pin header (J3) and a 10K resistor (R12). This will then give you a way to disable ROM 13 by fitting a jumper to J3.

Dave H :D