Dynamic Shift Registers - Bitsavers - Trailing-Edge

~ ____ .... _________ ~~~C~ATE... ... .... ... ... ..... ..... ...:... . 1 ..... 1 I •.... : I .!.: ... I... . I... .. I .:•••• : ::••••••••·1••• :•••• : •••.:00 01 ~ ro ~ ~ ~ ~.:. .... .... ...·......i ..: ... I.··: I·:·! I:. :: :... . ............ . ...llUnOOO 000001 000010 000011 000100 000101 000110 000111· . ·..n 12 13 14 1& 16 11IW1UOO 001001 001010 001011 001100 001101 001110 001111'"I···: :...: I···: :......!.. I II II I... :.::.: : ::: I::: ..... : ....... : ..... ::..:m 21 22 23 N 2~ 26 n...11111000 UIOOOI 010010 010100 010101 010111........ . . ...... .:. .. :. :. .: .· . . .....i3D 31 32i· .·".:.. ... .. .::I ··1 :.... I .....01100U 011010 0111111 ".. . .34 35 36011100 011101 011110". ...... . ::·i·· ··1·. ..:....011111.. ...... ......... . . .42 43 44 45 46100000 100001 100010 100011 100100 100101 100110..:....: . ..:.:....51· 52 53 S4 §5 5& 57101000 101001 101010 101011 101100 101101 101110 101111......& ..... ..... .: I··.. ........:I.··! • •••• .: ::.L ••••• :... • ..... ..:.. :.... ..... : ....: :...: !" M ~ ~ M ~ " ~....... .110000 110001 110010 110011 110100 110101 110lID 1101110000 o •O··...... .... ·.00 0 0.· 011 1214n111010 " 111001 111010 111011 " 111100 111101 " 111110 " 111111.. .. ...... •••• 1 ..:0· ....-41100111..:. .FIGURE 12. MM4241ABY/MM5241ABY Vertical-Scan ECMA-7 Font for Spanish Usel>ZICJ'I.....l>3(1)...(;'m::;,m::;,a.m... co'0(1)m::;,."o::;,...enPEDESTAL DISPLAYNEXTCHARACTERFIGURE 13a_ Sawtooth Vertical ScanFIGURE 13b. Pedestal Vertical ScanCHARACTERGENERATORINPutCHARACTERDATALEFT/RIGHTSHIFTERZAXISMODULATIONL,X·AXISINCREMENTr-... --=,,--.... +---------IMOVEALONGTOPORBOTTOMOFPEOESTALILINECOUNTERLINEDIVIDERDOT/COLUMNDIVIDERFIGURE 14. Conversion of Sawtooth Output to Pedestal ScanCUSTOM FONTSThe two ROMs can also be custom-programmedto provide special characters, or fonts larger than5 x 7. The MM4240/MM5240 actually stores 645 x 8 characters or character segments and theMM4241/MM5241 stores 64 8 x 6 characters orsegments. They are not limited to 5 x 7 and 7 x 5.For example, the extra height may be used in anotherwise 5 x 7 font to drop the tails of commas,sem icolons and lower-case letters below the bottomline of the capital letters. Fonts as large as 16 x 12are entirely practical without additional controllogic, using the chip-enable feature of fourMM 5241 s. Large-font organ izations are discussed inAN-40.271