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----- ---- --_.------------ - - --- Technical Reference Options and Adapters Volume 2 IBM Industrial Computer IBM Monochrome Display and Printer Adapter Contents Monochrome Display Adapter Function . .. 1 Printer Adapter Function ........................................ 8 Logic Diagrams .............................................. 13 IBM Monochrome Display and Printer Adapter Monochrome Display Adapter Function The IBM Monochrome Display and Printer Adapter has two functions. The first is to provide an interface to the IBM Monochrome Display. The second is to provide a parallel interface for the IBM Printers. We will discuss this adapter by function. The IBM Monochrome Display and Printer Adapter is designed around the Motorola 6845 CRT Controller module. There are 4K bytes of RAM on the adapter that are used for the display buffer. This buffer has two ports to which the system-unit microprocessor has direct access. No parity is provided on the display buffer. Two bytes are fetched from the display buffer in 553 ns, providing a data rate of 1.8M-bytes/second. The adapter supports 256 different character codes. An 8K-byte character generator contains the fonts for the character codes. The characters, values, and screen characteristics are given in "Of Characters, Keystrokes, and Colors" in your Technical Reference system manual. IBM Monochrome Display and Printer Adapter Monochrome Display Adapter Function (continued) The following is a block diagram of the monochrome display adapter portion of the IBM Monochrome Display and Printer Adapter. Processo r (12) Memory address address (1g. multiplexer (10) (10) 2K memory 2K memory character attribute code Data (8) Processo r bus (8) data gating Character clock BDo-71 (8) Octal Octal MA 1 latch latch RA Character Attribute AO (4) generator decode MC6845 Chip CRTC select DOr LK Shift Timing register signals Video process Serial dots logic HSYNC VSYNC CURSOR DISPEN Character r clock J l Monitor direct drive outputs IBM monochrome display adapter block diagram IBM Monochrome Display and Printer Adapter 3 Monochrome Display Adapter Function (continued) 7 6 5 4 3 2 0 Character code even address (M) 7 6 5 4 3 2 0 BL R G B R G B Attribute code odd address (M + 1) I I I Foreground Intensity Background Blink The adapter decodes the character attribute byte as defined above. The blink and intensity bits may be combined with the foreground and background bits to further enhance the character attribute functions listed below: Background Foreground R G B R G B Function 0 0 0 0 0 0 Non-display 0 0 0 0 0 1 Underline 0 0 0 1 1 1 White character/black background 1 1 1 0 0 0 Reverse video The 4K display buffer supports one screen of the 25 rows of 80 characters, plus a character attribute for each display character. The starting address of the buffer is hex BOOOO. The display buffer can be read using direct memory access (DMA); however, at least one wait state will be inserted by the system-unit microprocessor. The duration of the wait state will vary, because the microprocessor/monitor access is synchronized with the character clock on this adapter. Interrupt level 7 is used on the parallel interface. Interrupts can be enabled or disabled through the printer control port. The interrupt is a high-level active signal. IBM Monochrome Display and Printer Adapter 5 Monochrome Display Adapter Function (continued) Bit number Function 0 + Horizontal drive 1 Reserved 2 Reserved 3 + Black/white video 6845 CRT status port (Hex 3BA) Connector Specifications 9-Pin Monochrome Display connector At standard TTL levels Ground 1 Ground 2 Not used 3 Not used 4 IBM IBM Not used 5 Monochrome Monochrome + Intensity 6 Display Display + Video 7 and Printer + Horizontal 8 Adapter - Vertical 9 Note: Signal voltages are 0.0 to 0.6 Vdc at down level and +2.4 to 3.5 Vdc at high level. Connector specifications IBM Monochrome Display and Printer Adapter 7 Printer Adapter Function (continued) The following is a block diagram of the printer adapter portion of the Monochrome Display and Printer Adapter. 8 25-pin D-shell I E connector ~us buffe ...r8.......... ~Data latch........... _8---1~ r-+" Enable ,.. Clock .J!... Trans­ ceiver r DIR DIR O.C. "'R'8ad drivers SLCTIN AEN -+- data STROBE Write data Command I---------+~ AUTO decoder Write control FD XT Read status Read INIT control ~ Bus Control buffers latch • Enable! ~ Clock ~ 5 ERROR -. Enable SLCT ~ Clear PE ACK Reset ~----------------~------------~ BUSY Printer adapter block diagram IBM Monochrome Display and Printer Adapter 9 Printer Adapter Function (continued) IBM monochrome display and printer adapter Input from address hex 3BC This instruction presents the system-unit microprocessor with data present on the pins associated with the output to hex 3BC. This should normally reflect the exact value that was last written to hex 3BC. If an external device should be driving data on these pins at the time of an input (in violation of usage ground rules), this data will be ORed with the latch contents. IBM monochrome display and printer adapter Input from address hex 3BD This instruction presents the realtime status to the system-unit microprocessor from the pins as follows. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin 11 Pin 10 Pin 12 Pin 13 Pin 15 - - - IBM monoch rome display and printer adapter Input from address hex 3BE This instruction causes the data present on pins 1, 14, 16, 17, and the IRQ bit to be read by the system-unit microprocessor. In the absence of external drive applied to these pins, data read by the system-unit microprocessor will match data last written to hex 3BE in the same bit positions. Notice that data bits 0-2 are not included. If external drivers are dotted to these pins, that data will be ORed with data applied to the pins by the hex 3BE latch. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 -- -- -- IRQ Pin 17 Pin 16 Pin 14 Pin 1 Enable Por = 0 Por = 1 Por = 0 Por = 1 Por = 1 These pins assume the states shown after a reset from the system-unit microprocessor. IBM Monochrome Display and Printer Adapter 11 r 0 c.c (") -.C Q) c.c.., • liD Slot 74lS244 Q) 9 (Sheet 6) 00 A09 A31 y BAD (Shllt 2.4.8) 7 3 A08 A30 BAI (Shllt 2.4.8) 01 5 tn 02 A07 A29 BA2 (Shlet 2.4.8) ::17 1U~ 3 A06 A28 G ! BA3 (Sheet 2.4.8) 03 -- 04 A05 05 A04 ~19 g~ A03 (Sheet 6) 07 A02 A27 A4 (Sheet 2.4) A26 A5 (Sheet 2.4) (Sheet 3) +1/0 Ready AID A25 A6 (Sheet 2.4) A24 A7 (Shllt 2.4) (Shllt 9) +IRO 7 821 A23 A8 (Sheet 2.4) A22 A9 (Shllt 2.4) A21 AID (Shllt 2) A20 All (Sheet 2) A16 A15 (Sheet 4) A15 A16 (Sheet 4) A14 Al7 (Sheet 4) A13 A18 (Shllt 4) A12 A19 (Sheet 4) All AEM (Sheet 4.6) Olcoupllng capacitors 830 --B03 B03 --B29 1. +5V 829 T .,,:1' BOI I Ground t t ..1 L. J 0.047 !iF BID B31 T +12V --BOI B09 --B31 Bll -MEMW (Sheet 3.4) t 74lS125 T" l~ "'1 BID 11 $1 BI2 -MEMR (Sheet 4.6) U59 @ 12 C13 ":' ~ 74lS125 8 813 U59 -lOW (Sheet 2.4.8) ~ 9 Cl0 o ":' 74lS125 6 o= 814 U59 -lOR (Sheet 4.6.8) (") 5 ~ C4 ":' o 74lS125 3 S B02 2 U59 +Ruet (Sheet 2.3.5) (1) 74S04 12 9- ":' U56 -Rmt (Sheet 3.5.7 .8) .0 ~ liD Clock (Sheet 4) ~ B20 III =0- ""0 Monochrome display adapter (Part 1 of 10) g''""1 ~ >0- III 'S ~ -W r- 0 CC_. (") C_. Q) CC.., Q) +5V 3 nrl -Jumper ISheel7J tn JI 10 5~ 6 74LS04 i +Jumper (Sheel4.5J ........... ~ ~~JT-----------------------------===~;==========================Ih,14S86 ~ (SheellJ + resel ----fT======~---------------------~:=~~ -CEROM (SheellOJ § ......... 74LS2 8 I 74LS174 11 r ___:3::-1'7.':Q:S;~;;·Dl_I_t1J_1_2 _J~_U5_4 __ 1_1 --f---------------- 05 (Sheel5J :::s c::: 10 UIOO T-ir~~=~ 2 21 U25 p-:-3 ______+- ______________ S/L (SheellOJ Cb RPI 2 13 12 19'20 2~~ . ~ +5V I I U6 ---J..,l.!~ UI !~~ 474LSOO 11 ~ L..-_______--.:7~4~LSIO ------#14 60...J50 50 12 51 U25 6 1214 KJ U5 (SheellJ _ resel -.l ~ ~9 CLK 51PfiC6• ~74LS04 , +5V ~'if':" CLR Q 9 r==!l3 74lS10U. }p...::6:....- ___ -WE (Sheet 2.6J 74LS04 r~44 il.=.:.--...J I r-- (SheellJ -MEMW +6845CS 3 U2 4 T 74L8112A l .---___--.-J (Sheel4J V 74SL04 I 3 3 74811 +CACS CCLK (Sheet 2J (Sheel4] E (Sheel4J -CPU MSEL ~JI U2 2! K ~1174LS025 12 U57 13 I 9 ~U26}.6I +CCLK (Shee15.IOJ +5V 1 PR Q r--W 74LS04 1 1U~?"'o-=----t_+---+-------74LS~4 ~H-------- -CCLK (Sheel2J _---~cr.... CLKU5 13~2v 6 74LSI53 15~~ U2 rII 74LS74 5 ICO I 74LS08 CLK 1 -XACK TeslOSC 43 ICI IY 7 ~,..=.t U3 3 ~CLK3 74LS74 Q1. 5 1012 PR0 U4 Qf·rr-,---t------------ 9 1C2 HACK (Sheet 6J (SheeI7]-HRES _ ~ IC3 12 74LSOO 1 +5V I 0 u41 ~3"'1..:::CL:!!R_~Qkp-=-8IT--"""--:-------- 14 B UZ4 13 U25'\,H 4 CLR - --'J" +10 Ready (SheellJ (Sheel 2] RA3 1if A PR 0 6 ~2 3 74LSI25 +5V -..!.L ~~~ 2Y 9 l 1 U36 ?1-C------ OOTCLK (Shee17.IOJ +5V 16.257 8 13 2C31G 2G ROMAII (SheellOJ ~47 MHz ~ 122C2~ I 74532 l --~====-=-------=-=============:===========:----========~------- @ 5 U43 -CLR video (Sheet 5.7.IOJ ~ OSCI r T 3 74LS04 1 i -Cursor OLY (Sheet5J ~ (SHT 2] OISPEN'=' - I 3 ~74--~2 ~;>~~8----=-74ilSo4------------------ o (SHT 2J CURSOR '4 10 2Q 7 U44 I -Dispense OL Y (Sheet 7J ::3 r-s 20 IQ~ ~4LS04~~~2------------------- o r +Dispense OL Y (Sheet 7J ('l ~ ~~~~~F=~~=====±===~=~~W~5~6~-----~============ ::r ~~~~~ ~~ ~HltO==~-~====~l~===~~~~~~=================== +Cursor OLY (Sheet 5J a (Sheel 2] VSYNC :! 50 5Q ~ r:=========-=--------================== +HSYNC OLY (Sheel4.7J a ~~BI~+~~ ~~ ~rl;5=====f~I----------~=====~~~~~~~~~=~====~~ +VSYNC OLY (Sheet 5.7J (1) -------,I, 1 CLK Q I ~ .0 ~ ___________~I ~274LS74 ~ 11 0 4 74LS32 Il) 10 CLK 0 9 5 Ul00 6 ::3 0- ~~R UIOI ::,tl g" ~ Monochrome display adapter (Part 3 of 10) ;J> 0- Il) "g.
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