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+--- Thread: Hi from Lew (/thread-274.html)
RE: Hi from Lew - MbeeTech - 05-02-2021
(05-02-2021, 01:27 AM)Ernest Wrote: Would have been great to have the old mechanical Teletype I had back in the eighties and give the BAUDOT a go. Oh well, I'm sure I'm not alone in ruing the throwing out of something that was taking up too much space
I've occasionally looked around the airwaves for RTTY broadcasts.
Here in Melbourne in the 80's there was a regular wednesday night RTTY broadcast from the WIA and then
afterwards there was a group that shared RTTY art / pictures. I recorded quite a lot of the RTTY pic broadcasts
and have them on file. I had made up a RTTY transceiver that was connected to the Bee's parallel port and wrote
my own software for it.
At the time I was a licensed (Limited) amateur but have since let my license lapse (VK3XNC)
RE: Hi from Lew - Ernest - 05-02-2021
(05-02-2021, 11:21 AM)ejwords Wrote:Thanks for the picture EWAN,(05-02-2021, 01:27 AM)Ernest Wrote: Thanks Ewan for giving me the confidence that the B-ETI would work on a unmodified Mainboard, I decided to drop a BETI PROM into my MB1656 Coreboard in place of the v54 D-Boot ROM and fired it up.
Bingo and operational B-ETI looks like all the extra SRAM is not causing any issues (certainly on the bit of testing I did today)
Hi Ernest.
I hadn't thought of trying the ROM in a 56K coreboard. Good thinking.
The one I have has a MB1732 (32k rom based) coreboard in it as per the pic attached.
If I'm recalling correctly, the one my mate had was the same configuration.
I must look up the ECN you mentioned. Thanks for that.
All the best to you.
I think you will find the SRAM on your MB1732 will have had a minor board alteration to place the SRAM in memory space of D800h - DFFFh just under the B-ETI ROM address. No changes need for the 56k as it already has SRAM all the way up to E000h the B-ETI start address. The !ROM SEL will also be set for address E000h.
I also was a Radio amateur back in the eighties (VK6WM) however also let my license expire as family life took over the priorities.
Ernest