From:	N%"rja@uk.ac.ed.lfcs"  4-JUL-1991 17:17
To:	rja@uk.ac.ed.lfcs, rwt@uk.ac.ed.lfcs
Subj:	4 commands: details

Via: LFCS; 4 Jul 91 17:17:50 BST
From: Robert Armstrong <rja@uk.ac.ed.lfcs>
Date: Thu, 4 Jul 91 17:23:26 BST


Within the 4 command there are actually 8, 1 for each bit).
the opcodes for each mnemonic are given:
RMB0	-	$07
RMB1	-	$17
RMB2	-	$27
RMB3	-	$37
RMB4	-	$47
RMB5	-	$57
RMB6	-	$67
RMB7	-	$77

SMB0	-	$87
SMB1	-	$97
SMB2	-	$A7
SMB3	-	$B7
SMB4	-	$C7
SMB5	-	$D7
SMB6	-	$E7
SMB7	-	$F7

BBR0	-	$0F
BBR1	-	$1F
BBR2	-	$2F
BBR3	-	$3F
BBR4	-	$4F
BBR5	-	$5F
BBR6	-	$6F
BBR7	-	$7F

BBS0	-	$8F
BBS1	-	$9F
BBS2	-	$AF
BBS3	-	$BF
BBS4	-	$CF
BBS5	-	$DF
BBS6	-	$EF
BBS7	-	$FF

The format for each of the four instructions is:
RMBx  <addr>
SMBx  <addr> where addr is a 1 byte address
BBRx  <addr> <addroffset> where addr is a 1 byte address
                          and addroffset is a 1 byte offset
			  from the current address
Here is an example of BBR:
DA60  5F 4A 03  BBR5 &4A,&DA66
DA63  4C 40 DA  JMP  &DA40
DA66  D7 4A     SMB5 &4A
(and SMB)
BBS and RMB are the same format.
Thats it...
the name of the processor is 6511Q if you want to create a
new assembler - this may be used in the future in conjunction
with the photocopier controller.
	Rab