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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Fri Feb 02, 2018 10:59 pm
by exxos
rpineau wrote: ↑Fri Feb 02, 2018 10:17 pm
tested on both STE and MSTE
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon Feb 19, 2018 10:24 pm
by exxos
Tiny update.. PCB's finally arrived
Need to do a order to mouser and get the ATF chip and some other bits next...
- sec-pcb.jpg (135.69 KiB) Viewed 6932 times
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Tue Mar 06, 2018 6:52 pm
by exxos
Small update.. Parts now ordered for this.. I'm going to ship the three boards and parts to a place in the UK for assembly as I just do not have time to do it. So hopefully in a few days time I can get the boards back and actually start working on the firmware.
Just as a re-cap, this board is the 68SEC000 test board, so I can see what the maximum speed of the CPU is. I am hoping to get it running at 50-64Mhz.
Even if the CPU cannot manage much more than the 68HC000 PLCC CPU, I will likely still use the SEC simply due to it is smaller, and a proper SMT package. With all the problems I am having with sockets, I have no choice but to move to a direct soldered part anyway. So moving to the 68SEC000 CPU is basically a good move anyway.
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Fri May 11, 2018 7:58 pm
by exxos
PCBs finally arrived... next to find time to finish firmware and test it.. but likely will finish the plug in STE booster first...
- sec1.jpg (62.54 KiB) Viewed 6623 times
- sec2.jpg (73.29 KiB) Viewed 6623 times
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon May 21, 2018 12:46 pm
by exxos
Finally cleared my table.. Now to work on the firmware..
- IMG_2728.JPG (184.39 KiB) Viewed 6558 times
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon May 21, 2018 7:19 pm
by exxos
So something amiss, anyone any ideas whats going on here ?
- dma.jpg (83.84 KiB) Viewed 6545 times
EDIT:
I tried removing AVEC from my code just to see what happens, and diag-cart says autovector error.. so that much be working... but still no idea whats going on with the DMA errors unless some sort of bus grant issue
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon May 21, 2018 7:34 pm
by rpineau
$FFFFFC00 and $FFFFFC02 are adresses for Keyboard ACIA .. so there might be something going on with VPA/VMA there.
The 2 other one are code on the cartridge port.
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon May 21, 2018 7:55 pm
by exxos
Its odd, because I see activity on VMA, but not VPA or AVEC ... but VMA shouldn't go low without VPA being low to start with ?!
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon May 21, 2018 9:08 pm
by rpineau
Is the E clock running properly ?
AVEC should definitely do something on interrupt from the keyboard. But if we can't write to the ACIA it probably doesn't trigger interrupt yet.
So it's really around VMA/VPA
Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS
Posted: Mon May 21, 2018 9:22 pm
by exxos
rpineau wrote: ↑Mon May 21, 2018 9:08 pm
Is the E clock running properly ?
Looks good on scope..
rpineau wrote: ↑Mon May 21, 2018 9:08 pm
AVEC should definitely do something on interrupt from the keyboard. But if we can't write to the ACIA it probably doesn't trigger interrupt yet.
So it's really around VMA/VPA
No idea, I keep trying things, but no luck..
If I keep pressing reset, I see VMA pulse low.. though I half recall it does pulse more than VPA.. will have to re-read my notes tomorrow..
VPA I have trouble seeing any pulses.. but thats generated from GLUE anyway...
I don't get why diag-cart says DMA time out.. has nothing to do with CPU really