Zanchius wrote:
I would be comfortable in flipping a byte or two on the EPROM image, I managed to find a programmer that can burn 27256 chips so that also wouldn't be an issue.
May I ask which bytes should be changed?
Hi Flavio,
Download the EPROM source file at <> from the website at <>.
In the .ASM or .LST file, search for "LD (ACE_BAUD),A". It occurs in two places. The first one sets the initial baud rate to 9600 (with a 1.8 MHz resonator or 1.8432 crystal). Change the byte at 01AE to whatever is correct for your crystal and desired baud rate.
01A5 21 80FF COLD_START LD HL,RC_TYPE
01A8 06 0F LD B,CS_CLR_LEN
01AA CD 100C CALL CLEAR_BLOCK
;DB 0 ;(RC_TYPE)
;DB 0 ;(RC_SOFT)
;DB 0 ;(RC_STEP)
;DB 0 ;(RC_CC)
;DB 0 ;(RC_HALT)
;DB 0 ;(RC_F0)
;DB 0 ;(RC_RST0)
;DB 0 ;(RC_HARD)
;DB 0 ;(RegPtr)
;DW 0 ;(ABUSS)
;DB 0 ;(IoPtr)
;DB 0 ;(RX_ERR_LDRT)
;DB 0 ;(RX_ERR_STOP)
;DB 0 ;(RX_ERR_OVR)
01AD 3E 0C LD A,12 <=== this sets 9600 baud!
01AF 32 8FFF LD (ACE_BAUD),A
Or, if you're using the Z80-CPU card serial port, you can change the Z80-SIO card baud rate using this call:
080B CD CA0D PORT_SPEED CALL PRINTI
080E 0D0A2830 433D3936 DB CR,LF,"(0C=9600) BAUD:",EOS
0816 30302920 42415544
081E 3A00
0820 3A 8FFF LD A,(ACE_BAUD)
0823 CD F60D CALL PUT_BYTE
0826 CD 490D CALL SPACE_GET_BYTE
0829 D8 RET C
082A 32 8FFF LD (ACE_BAUD),A
082D CD F214 CALL ACE_SET_BAUD
0830 C9 RET
Hope this helps!
Lee
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
--
This email has been checked for viruses by Avast antivirus software.
Lee Hart