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| cs8900a Data Sheet for RR-net programming http://retrohackers.org/viewtopic.php?f=7&t=14 |
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| Author: | RaveGuru [ Wed Jan 11, 2006 10:59 pm ] | |||
| Post subject: | cs8900a Data Sheet for RR-net programming | |||
This is the official Data Sheet for the Cirrus Logic 8900a NIC
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| Author: | Graham [ Fri Jan 13, 2006 1:01 pm ] |
| Post subject: | |
For RR-Net programming you also need a 2nd datasheet which describes the 8-bit mode a bit further. Some important information from the datasheet: If you receive a frame from the streaming registers, you have to read the first two 16 bit words in hi/lo order, and all following words in lo/hi order. If you don't do it like this, you will have strange byte skipping effects. Code example: LDA $DE09 STA TYPE+1 LDA $DE08 STA TYPE LDA $DE09 STA SIZE+1 LDA $DE08 STA SIZE LDA $DE08 ... LDA $DE09 ... etc |
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| Author: | RaveGuru [ Fri Jan 13, 2006 2:04 pm ] |
| Post subject: | |
Very interesting! I had no idea about this! Perhaps that could explain some of the mysterious problems i had with my UDP/IP code... PS. I've added the Documentation on 8-bit mode! Thanks for pointing it out 
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