RM65-5102 CRT Controller (CRTC) Module

I have an example of this Module in Eurocard format.

Here are copies of the Data Sheet and User's Manual for the Module:

• RM65-5102E CRT Controller (CRTC) Module Data Sheet 1984.pdf

• RM65-5102 CRT Controller Module User's Manual.pdf

Software

Here is a dump of the on-board 2K ROM (R14B4-11) which I have started to disassemble:

• RM65CRT.rom

• RM65CRT.ca65

• RM65CRT.list

The board is located at $9800, the I/O at $9800 and the ROM from $9900.

The CRTC application is executed from $9900 and provides the following single character commands:

(I will add details of the initialisation process for an AIM 65)

Hardware

Here is a photo of the track side of the board: 

Board Configuration

The board has a single bank of DIL switches and a couple of links.

The DIL switches (S1) set the 4K Block address and configure Bank selection.

 Display RAM will be assigned to the first 2K of the Block, I/O to the next 256 bytes and the ROM to $x800 to $x8FF.

There are several jumpers that configure other boards features:

• E1 Enables the on-board ROM, the normal position is A, enabled

• E2 selects the Dot Clock Frequency - 6 or 12 MHz, the normal position is B 12 MHz

• E3 selects which half of a 4K ROM to use, the normal position is 'Ground', lower half

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