For comparison here is an SWTPC MP-L.
Reproduction of the SWTPC MP-LA Parallel board. The biggest change from the original board is the use of a jumper strip instead of soldered connections for IRQ/NMI. The reproduction has a solder mask and silkscreen while the SWTPC board does not.
The MP-LA Parallel Interface is a 5 1/4 inch x 3 1/2 inch board implemented with the 6821 peripheral interface adapter integrated circuit which is used to interface a parallel data device to the computer. The board is provided with two separate connections along the edge of the board. Each connector contains eight data lines which may be programmed for either outputs or inputs, one "data ready" line, and one "data accepted" line for full handshake control. All data lines are fully buffered with bi-directional transceivers to allow eight inputs and eight outputs, 16 inputs and no outputs or 16 outputs and no inputs. Programming of a particular set of data lines is done via jumpers on the MP-L board. Software control of interrupt lines and the polarity of the handshake lines is provided.
Downloads
MP-LA User Manual. PDF User Manual, includes schematic
| MP-LA-Bare | Bare Board | $7 |
| MP-LA-ASM | Assembled MP-LA, Shipped with 68B21 for 2MHZ operation | $49 |