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USER CUSTOMIZATION

M68CPU32BUG REV 1 C-4

9. Power up the newly programmed BCC and note the checksum value indicated.

Repeat steps 1 through 8 above, to set the checksum to this value but with the

changes noted below. The CODESIZE parameter at offset $08 can be altered to make

the checksum valid only over the CPU32Bug half of the EPROM so user code in the

second half can be freely changed. Since a checksum error is simply reported on the

display terminal and code execution continues, it is not mandatory to set the

checksum.

STEP 1: No change.

STEP 2: Change checksum to the value noted on power-up per the command

below where "XXXX" is the value noted.

CPU32Bug>MS 400E XXXX<CR>

STEP 3: Change the filename to C32B1C.MX. To speed up reprogramming, a

temporary file consisting of only the checksum word could be used by

entering DU 400E 400F ’TMP.MX’ ,DC000<ALT-F1><CR> after

creating the C32B1C.MX file.

STEP 4: Skip this step.

STEP 5: No change.

STEP 6: Change the filename to C32B1C.MX.

STEP 7: This step is optional.

STEP 8: Only the checksum value needs to be programmed using the indicated

value. Since the checksum was set to the unprogrammed state of the

EPROM ($FFFF), programming can start immediately. DO NOT

ERASE THE BCC EPROM!

10. Power-up the BCC once again. The checksum message should not appear.

11. On the host computer, enter the following commands to update the two CPU32Bug S-

record files so they may be properly archived to a floppy disk for safe keeping:

C>DEL TMP.MX<CR>

C>DEL C32B1.MX<CR>

C>RENAME C32B1C.MX C32B1.MX<CR>

C>COPY C32B*.MX A:<CR>

12. The customization procedure is now complete.

USER CUSTOMIZATION

M68CPU32BUG REV 1 C-5

C.3 CUSTOMIZATION TABLE

Table C-1. CPU32Bug Customization Area

Offset Default Value Mnemonic Description

$00-03 $00002FFC PWR_SSP Power on/reset stack pointer

$04-07 $000E0090 PWR_PC Power on/reset program counter

$08-0B $00020000 CODESIZE Size of CPU32Bug ROM in bytes:

Number of bytes for checksum calculation. Must be

an even number of bytes.

$0C $20 SRECMAX Maximum number of data bytes for S-record created by

DU command

Legal values = 1–255 ($01–$FF).

$0D $FF CHECKALT Checksum alternate:

Change this if CHECKSUM should ever be

calculated as $FFFF.

$0E-0F $3033 CHECKSUM Checksum value:

$FFFF = calculate new checksum value, else

checksum has been set. In either case CPU32Bug

simply reports any error and continues toward the

ready prompt.

Old Chip Select Table (Rev. A BCC + Rev. A PFB)

$10-11

$12-13

$0003

$5830

.CSBAR0

.CSOR0

CS0 base address register value and

. option register value

$14-15

$16-17

$0003

$3830

.CSBAR1

.CSOR1

CS1 base address register value and

. option register value

$18-19

$1A-1B

$0103

$6870

.CSBAR2

.CSOR2

CS2 base address register value and

. option register value

$1C-1D

$1E-1F

$0103

$3030

.CSBAR3

.CSOR3

CS3 base address register value and

. option register value

$20-21

$22-23

$1004

$5870

.CSBAR4

.CSOR4

CS4 base address register value and

. option register value

$24-25

$26-27

$1004

$3870

.CSBAR5

.CSOR5

CS5 base address register value and

. option register value

$28-29

$2A-2B

$FFE8

$783F

.CSBAR6

.CSOR6

CS6 base address register value and

. option register value

$2C-2D

$2E-2F

$0000

.CSBAR7

.CSOR7

CS7 base address register value and

. option register value

$30-31

$32-33

$FFF8

$680F

.CSBAR8

.CSOR8

CS8 base address register value and

. option register value

$34-35

$36-37

$0000

.CSBAR9

.CSOR9

CS9 base address register value and

. option register value

$38-39

$3A-3B

$0103

$5030

.CSBAR10

.CSOR10

CS10 base address register value and

. option register value

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