6809 was the best 8-bit microprocessor ever made, I ordered a couple while they are still available.
compatible SRAM and some program storage memory that is relatively easy to program as I have no idea where my EPROM programmer has gotten off to. Any recommendations welcome.
Quote6809 was the best 8-bit microprocessor ever made, I ordered a couple while they are still available. I used to program on a 6809 as well. How about we make a retro dual processor (09/Z80) board Quotecompatible SRAM and some program storage memory that is relatively easy to program as I have no idea where my EPROM programmer has gotten off to. Any recommendations welcome.There's plenty of SRAM around these days that will work. As for the EPROM, maybe use flash or just battery-back the SRAM. You could build in a modern micro to act as a programmer.Another idea is to have an modern micro actually serve the EPROM data.______Rob
An ABM Ultrasonic Industrial sensor (used for measuring fullness of large tanks, I think), .7 - 20ft range, absolutely no idea what to use it for, but won the auction on a 99 cent bid with free shipping. 4- 20ma current loop it says, I'll have to research it a bit.I love oddball stuff....
Does anyone remember the "computer" from 70's made out of long plastic switches and wires and lights? You stuck pre-printed paper in the plastic in front of the lights. You stuck wires in the holes. Each lever switched like 8 switches which were wired in parallel. I didn't know who else to ask this question to, so I thought I'd try here. It's related to the post about the gravity powered computer above.
As I recall though, it was very Motorola like at the bus level
I was thinking about building a programmer for EEPROM that ran off my Raspberry Pi.
I thought since the hex files would already be on it it would make sense to use it for the programmer.
How would you propose serving the EPROM data via micro?
Unless you plan to remove the chip for programming you have to dual port the memory chip, easy enough but adds several chips. I had an EPROM emulator on the market that plugged into the EPROM socket and used SRAM with the dual porting added.
Well these old chips weren't very fast eh? Maybe connect the AVR (or whatever) up with pins the same as an EPROM and monitor the CS/RD signals, when you see an active select you use the address to index into an array and provide the data.This was proposed by somebody here quite some time ago, originally I poo-pooed the idea but it may have legs. Especially if you can control the target CPU's clock.
Adding dual-ported RAM would be easier but uses a few chips, this idea only needs a single chip.
Or build an FLASH emulator for development and drop a chip in when finished, just like we used to do but without the UV light
I'll never forget the smell of conductive foam exposed to UV light!
I had two big EPROM erasers running full time.
QuoteI'll never forget the smell of conductive foam exposed to UV light!It's funny how you remember such things.QuoteI had two big EPROM erasers running full time.That's why I built the emulator, got sick of swapping chips.______Rob