BBC Microcomputer Service Manual Oct 1985 Section 1 BBC Micro ...

170 !(&3200 + offset%) = &4433283F
180 !(&3204 + offset%) = &1B19021E
190 !(&3208 + offset%) = &13721293
200 !(&320C + offset%) = &002C002C
210 ENDPROC
220
230 DEFPROC strobe select lines
240 [OPT opt%
250
260 .loop
270 LDA &FE00 \ IC2 pin 25 (CRTC)
280 LDA &FE08 \ IC4 pin 9 (ACIA)
290 LDA &FE10 \ IC7 pin 9 (SER PROC)
300 LDA &FE18 \ IC96 pin 1 (STATID) or IC97 pin 4 (INTOFF)
310 LDA &FE20 \ IC97 pin 2 (INTON)
320 STA &FE20 \ IC6 pin 3 (VID PROC)
330 STA &FE30 \ IC76 pin 9 -(ROMSEL)
340 LDA &FE40 \ IC3 pin 23 (VIA A)
350 LDA &FE60 \ IC69 pin 23 (VIA B)
360 LDA &FE80 \ IC78 pin 24 (FDC)
370 LDA &FEAO \ IC89 pin 9 (ADLC)
380 LDA &FECO \ IC73 pin 23 (ADC)
390 LDA &FEE0 \ PL 12 pin 8 (TUBE)
400 LDA &FC00 \ PL 11 pin 10 (FRED)
410 LDA &FD00 \ PL 11 pin 12 (JIM)
420 JMP loop
430 ]
440 ENDPROC
450
460 DEFPROC DRAM test
470 [OPTopt%
480 LDX £&OF
490 STX &FE20 \ Write to Vidproc
500
510 .setup_6845
520 LDA table%,X \ table of 6845 data
530 STX &FE00 \ Register number
540 STA &FE01 \ Contents of register
550 DEX
560 BPL setup_6845
570 LDA £3
580 STA &FEFE \ send down TUBE
590
600 .restart
610 LDY £0
620
630 .loop2
640 NOP
650 TYA
660 STA &7C00,Y
670 STA &7D00,Y
680 STA &7E00,Y
690 STA &7F00,Y
700 INY
710 BNE loop2
720
730 LDA £&42
740 STA &FE20 \ Write to Vidproc
750 JMP restart
760 ]
48