I haven't tried with jump yet - I will try - I found instructions for installing the memory expansion cardOn my Superpet I found I needed the rom switch in place. You can put a jump wire as I have shown in one of the photos and then when in Superpet mode select monitor
Then display the first few bytes of ram after $9000 using the d command.
d 9000-9020
Try changing the ram contents by over typing and see if it is retained by typing d 9000 again
I am not by my Superpet right now so cannot give you the full syntax.
The b n command where n = 0 to f I think selects different banks of ram
There is a 6502 BASIC memory test somewhere. You can specify the start and finish address. For the SP9000 the start address would be $9000 and the finish address would be $9fff.
You can select the bank of 4K out of 64K by poking the memory address for the bank switch register and run the memory test on the block of memory at $9xxx.
You can obviously automate this testing by modifying the BASIC program.
I am on a business trip at the moment, so I haven't got any access to my SP9000 documentation I am afraid.
Yes, the base memory of the PET is 32K. The 64K of SP9000 memory is mapped into address $9xxx as 16 banks of 4K.
Dave
Thanks,See attached - doing a simple copy and paste didn't work as it replaced some text with a smiley face!
The later version of the SuperPET with combined CPU and Memory board has only the two switches.
Yours is the "3 board" version which has the extra switches.
I did a video on a SP9000 restore not long ago, here's a link. SP9000 Disassembly
Photo showing the switches and wires. The switches disable a couple of the ROM sockets.
Here's a brief explanation of the switched sockets, which aren't really needed unless you have EPROMs in those sockets Switched Sockets
My switch goes to a 3-pin header on the processor board, next to the serial port, but you seem to have a different version that doesn't have that 3-pin header.
I've never seen those wires soldered to the bottom of the mainboard. Strange.
View attachment 1242342
I already have DIP sockets and switchesHere is a photo which may help View attachment 1242545
Waterloo menu…The interesting thing for me is that the word "Loading" is not correct.
Let's go back to basics shall we?
When you turn the machine ON in 6809 mode, what do you first get on the screen?
Dave
It could be anything.So you are getting some corruption somewhere. It was the 'o' that was in error last time and it is the 'L' this time.
So, how many of the diagnostic tests have you run on both the SuperPET and the standard 6502? This could be a video circuit/video RAM or character generator issue on the 6502 side, or a ROM/RAM issue on the 6809 side.
Have you tried my PETTESTER ROM on the 6502 side?
Dave
A) I do not have such a deviceSo you are getting some corruption somewhere. It was the 'o' that was in error last time and it is the 'L' this time.
So, how many of the diagnostic tests have you run on both the SuperPET and the standard 6502? This could be a video circuit/video RAM or character generator issue on the 6502 side, or a ROM/RAM issue on the 6809 side.
Have you tried my PETTESTER ROM on the 6502 side?
Dave