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Recent content by djrm

  1. djrm

    Conway's Life on AIM-65 recreation

    Conway's Life on AIM-65 recreation Hello everyone, here are some notes about my recreation of an AIM-65 together with Scott Baker's CRTC display and the AH5050 rom driving a simple interface to a SD2IEC simulation of a COmmodore 1541 disk drive. Using 6502 MECB boards to make an expanded...
  2. djrm

    AIM-65 Video Output Success.

    There is a fuzzy image in the CRTC manual showing all the available characters available but I never found a better version. What I have found though is a program to dump the character generator rom as a bitmap. Here is a version of the output with a grid overlay. The program I used was found...
  3. djrm

    1541 Drive & AIM-65 help.

    I tried moving some CRTC page zero memory and found a solution, see here: https://forum.vcfed.org/index.php?threads/aim-65-video-output-success.1212813/post-1450785
  4. djrm

    AIM-65 Video Output Success.

    I have been investigating an incompatibility problem which shows itself when trying to access files using the AH5050 interface when the CRTC is in use. Today I have found a solution which seems to help. The CRTC uses some page zero memory which conflicts with that used by the AH5050, my solution...
  5. djrm

    1541 Drive & AIM-65 help.

    Ive been reading up on using forth with disk access in the AIM-65 Forth manual and found the implementation notes for the buffer allocation and R/W dand DISK access words suitable for the WD1770 disk controller interface. I'm hoping these can be amended to suit the AH5050 somehow - I'll need to...
  6. djrm

    1541 Drive & AIM-65 help.

    I've had a play using cbmctrl to see how the SD2IDE behaves with relative file creation, everything seems in order using the scrips below, I had to use a binary editor to fill the byte value parameters. I expect another editor could cope with the control characters ok - adding a zero byte upsets...
  7. djrm

    1541 Drive & AIM-65 help.

    Thanks, I'll look into this. The record length byte is 0x80 Maybe this is a primitive to access a block from a file for the R/W function. I'll have a stab at understanding the disassembly which access that filename. I now have Forth 1.3 working on my recreation, I have managed to use the editor...
  8. djrm

    1541 Drive & AIM-65 help.

    Im looking through the ah5050 rom disassembly trying to understand how the system works using the file 'AH5050 - commented disassembly.txt' as reference. Today I am looking at the possibility of using the Forth interface. There seems to be very little implemented in the rom, so far all I can see...
  9. djrm

    1541 Drive & AIM-65 help.

    Unfortunately not, it is simply fixed in place where you see it. The system was an alarm controller intended for to be run 24/7, a serial card and telephone line interface cards are not shown in the photos.
  10. djrm

    1541 Drive & AIM-65 help.

    This small prototype board is my AH5050 interface, its connected to a SD2IEC 1545 emulation devic. The board also holds a promicro XUM1544 cbmctrl adapprer for communication with the PC. The PC connectivity has been handy for transfering files to the SDcard and issuing directory listings and...
  11. djrm

    1541 Drive & AIM-65 help.

    I found this small program useful to test the AH5050 initialisation, it is a dummy STARTUP file, does nothing but print a message to the screen:
  12. djrm

    1541 Drive & AIM-65 help.

    Here are photos of a couple of AIM-65 systems, the first is an original looking Rockwell, the second is a DYnaterm in a 19 inch rack case with expansion backplane. The Rockwell isnt working yet, I took its forth roms roms and put them into another system and proved they were ok. It reminded me...
  13. djrm

    AIM-65 Video Output Success.

    Greetings Scott, I discovered your design and now have a working display board attached to my AIM-65 recreation. I have wanted to have something with a 6845 chip in it for many years. Thanks for your dedication, it's much appreciated. David.
  14. djrm

    AIM-65 ACIA project

    Greetings, I have put together a transmit and receive driver for my AIM65 recreation, it uses a 6551 ACIA. The receive driver uses an interrupt driven buffer with handshaking patched into the UIN vector. I can now import large text files without corruption. Best regards, David.
  15. djrm

    1541 Drive & AIM-65 help.

    Hi Dave, I'll surely have some questions before long, I'm trying to fit INIBAS into a system with crtc display driver and a serial bios. things will need little massaging to fit nicely. Best regards, David.
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