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Would be great to have a step-by-step guide!

Thanks for doing this! I'll be bidding on one. For the prototypically challenged, is there a good source for schematics or steps for using this board for creating a RAM board to replace the 527 or 520?

Tom

I have a C4PMF with 24K RAM installed on a 527 board. I have acquired 527 and 520 boards and want to install one in the C4PMF to increase available RAM. Does anyone know if I need to run power separately to either of these board and/or whether there are any jumpers that need to be set so the C4P wil...

Mike,

Thanks for pointing this out. My knowledge of electronics is somewhat limited. I don't know where the memory expansion would be slotted on the 505B board and I'm not capable of editing\burning a modified GLU-GAL ROM. Tom

There's a stripped-down 525 board available on eBay. I've been looking for a way to add 16K to my C4PDF which has a single 527 board. If I were to build-out the board and add it to the available slot on the C4P, would be it be compatible with the 24K on the 527 and natively add the 16K on the 525? I...

So, it's the program located at the following address: http://www.osiweb.org/misc/OS65D%20Single%20Disk%20Copy.pdf As far as I can tell, things start going wrong after the gosub statement at line 26. The commands in the 5000-5300 range appear to return unusable values for X$(j). Those values are pas...

I'm troubleshooting a single-disk copy program that runs great under OS65DV3.2 but crashes when run under V3.3, 5" floppy. I've been able to trace the issue to a statement that PEEKs the values at location 55106 and 55109. As far as I can tell the values in those locations (and adjacent memory locat...

Looking to buy a working 527 board (or swap for it).

Items I can offer\swap: some combination of 600, 610 (both working), C1P case, 540A (untested)

Tom

Any advice on a way to increase the RAM capacity of the 527 board? I have a C4PMF with a single, fully-populated 527. Would like to add at least 8K to the system. Is it possible to piggyback chips onto the existing RAM installed on the 527? If it comes down to finding another 527 or 520 board, are t...

Hello,

Is there a resource on the forum or in print elsewhere that explains how the Modem port on a C4PMF can be used to load BASIC code (or machine code) for subsequent loading onto diskette?

Thanks, Tom