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2. A printer kit as de?ned in claim 1 wherein said console code printer interface further includes a print controller/synchronizer, the latter being coupled to said main processor and memory and to said printer, said print controller/synchronizer including means for detecting the presence of said mail piece and initiating the printing of said coded address information thereon at a predetermined time, and further including means for determining the quality of the last mentioned print ing. 3. A printer kit as de?ned in claim 2 wherein said data path controller includes a plurality of ganged switches for selectively providing destination data from said keyboard directly to said EZR in a no-print mode and from said main processor and memory via said key board I/O interface to said EZR in a print mode. 4. A printer kit as de?ned in claim 3 wherein said keyboard I/O interface includes a decimal-to-BCD converter coupled to said keyboard for converting said destination data to BCD format, the latter being applied to said I/O data bus controller for use in said main processor and memory, and further includes a BCD-to decimal converter for converting the BCD formatted destination data from said main processor and memory to decimal form and for applying the latter to said EZR via said data path controller.
5. A printer kit as de?ned in claim 4- characterized in that said coded address information is in the format of the POSTNET bar code system.
6. A printer kit as de?ned in claim 5 wherein said means for detecting the presence of said mail piece and initiating the printing of said coded address information thereon comprises photocell means coupled to a mail piece detector, the latter generating an output pulse in response to the detection of the trailing edge of said mail piece by said photocell means, counter means coupled to said mail piece detector, said output pulse of said mail piece detector clearing said counter means and effecting an interrupt of said CPU, shift register means coupled to said I/O data bus controller and being re sponsive to said interrupt for receiving bits of input data representative of at least a portion of the destination data for said mail piece, encoder means responsive to the motion within said letter sorting machine for gener ating a train of clock-type pulses, means interposed between said encoder means and said counter means for applying said last mentioned pulses to said counter means, said counter means having a clock count output terminal coupled to said shift register means whereby said input data stored therein is shifted, out bit-by-bit in response to said clock-type pulses, said counter means initiating additional CPU interrupt signals and resultant loading of said shift register means in response to the reception of predetermined counts of said clock-type pulses, said counter means having set count input termi nals coupled to said I/O data bus controller for limiting the total number of clock-type pulses which will be accepted thereby in accordance with the ZIP digit count and ?eld of the destination data, said printer being coupled to said shift register means and being respon sive to the data bits shifted out of the latter for printing equivalent bar code indicia on said mail piece.
7. A printer kit as de?ned in claim 6 wherein said means for determining the quality of said printing in cludes a read photo detector coupled to a bar code detector, the latter generating an output signal in re sponse to said photo detector, a pair of analog switches each having an input terminal coupled in common to 5 15 20 25 30 said photo detector to receive said output signal, said counter means having a pair of output terminals cou pled respectively to said analog switches, said counter means generating respective enable signals on said last mentioned output terminals in response to the occur rence of predetermined counts of said encoder clock like pulses, said analog switches providing output signal levels indicative respectively of the background and printed bar areas of said mail piece in response to said enable signals, means for comparing the amplitudes of said output signal levels and for generating an error signal in response to substantially like amplitudes, the latter being indicative of insuf?cient contrast between the printed bar and its background. 8. A printer kit as de?ned in claim 7 wherein said analog switch for providing an output signal level indic ative of the background area associated with a printed bar area includes capacitor means for storing said last mentioned signal level in order that it might be com pared. with a subsequent signal level indicative of said printed bar as generated by the other of said pair of analog switches. 9. A printer kit as de?ned in claim 8 wherein said keyboard of said input console is comprised of a regular section and an auxiliary section. 10. A printer kit as de?ned in claim 9 wherein said printer comprises a print head of the impact pin printer type and buffer means interposed between said shift register means and said print head for converting the data shifted out of the former to high current drive pulses for actuating the latter. * III * Ik *