From: Magnus Eriksson (mage2254_at_thedreamer.nospammail.net)
Date: 2006-11-18 19:13:25
Hi guys. I was browsing through back issues of Elektor at the local library when I noticed an article about building an ECG (electrocardiogram) cartridge for the Gameboy(s). The interesting bit was that it used a chip from ST to interface to the processor, and it was described as very good for interfacing to any 8-bit era CPU. So I looked it up, and it's pretty neat. The chip used was the PSD813, but there are some variations within the product line. The family: Flash In-System Programmable (ISP) Peripherals For 8-bit MCUs, 5V http://www.st.com/stonline/products/literature/ds/7833.htm Datasheet: http://www.st.com/stonline/products/literature/ds/7833.pdf Highlights: * 27 I/O pins (but you lose 8 when interfacing to a 6502 (non-multiplexed) bus) * Programmable logic (CPLD), "3000 gates" * 1 or 2 Mbit (128/256K) Flash * optional 256 kbit (32K) secondary Flash * optional 16/64/256 kbit (2/8/32K) SRAM, battery-backupable * Page mapping register (so you can access all that) :-) * JTAG (for reprogramming) I'm thinking that you could do some cool stuff with that, especially the programmable logic. It shouldn't even be that hard to hack up something that acts almost like a CIA/VIA. And that is before you figure out how to offload processing to the CPLD part. (First thought: GCR/MFM decoding?) And then you get a busload of memory too. It doesn't look like it's going to fit very well into a tiny memory window, but it would be interesting to try and work around that. Anyway; I figured someone here might have not heard about that sort of thing, and might be interested. MAgnus Message was sent through the cbm-hackers mailing list
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