old gold times, when people used UV-ROM to build their own made boards - Page 1
Forum section: electronics / general

author: legacy
author_rank: Super Contributor
timestamp: July 03, 2017, 03:25:02 pm
content: So, I want to tell it through imagesGameBoy, a couple of hacked cartridgesGameBoy cartridges hack, a look of the inside: the (mad) wiringGameBoy cartridges hack, a look of the inside: meet the MBC chipGameBoy cartridges hack, a NVRAM replaces the ROMClassic design, my first home made HC11 boardwhose RAM socket has been used to programa NVRAM for a GB hacked cartridgeClassic design, my first i'51 boardwhose RAM socket has been used to programa NVRAM for a GB hacked cartridgeA few application-ROMsThe (home made) programming socketIt was also useful to dump the content of a console's BIOS.New MC6809 board preview, still waiting to be cooked and assembed.It will for sure use an UVROM for its firmware, but during the developmentit will be loaded with the the same NVRAM trick used in the GB hacked cart.A few empty UV-ROM chipsThat's all folks

author: Bruce Abbott
author_rank: Frequent Contributor
timestamp: July 03, 2017, 04:51:12 pm
content: The 6809 board looks very interesting. Are you going to release the design?Here's my collection of EPROMs, and the programmer I built for my Amiga 1200.

author: legacy
author_rank: Super Contributor
timestamp: July 03, 2017, 05:32:59 pm
content: Well, first it has to pass both the DFM (design for manufacturing) levels. Currently it's just an EDA project with a prototype made on breadboards, and the firmware is just a poor miniMON (able to upload S19). I am more focused on two completely different projects: new ISA on fpga and its debug processor.The MC6809 project has been scheduled with the lowest priority

author: BrianHG
author_rank: Super Contributor
timestamp: July 05, 2017, 03:32:44 am
content: Quote from: Bruce Abbott on July 03, 2017, 04:51:12 pmWow, back in 89, I built a similar programmer for my Amiga 1000. Worked like a charm for all 8 bit eproms up to 4mbit. At the time, 4mbit didn't exist, but, 32 pin 1mbit eprom spec just became available and I was prepared with extra bits on the address counter which I did end up using as my programmer lasted and worked on my A3000&A4000 through the mid 90's. It ran circles around some very expensive IBM PC programmers, especially reads and verify.

author: legacy
author_rank: Super Contributor
timestamp: July 05, 2017, 07:58:44 am
content: The message here is: we can eventually use our home made boards, like the above, hc11 or 8051 board, to program a NVRAM, and use a NVRAM device (asynchronous static ram on parallel bus, with a battery to retain the information when poweroff) as "ROM" for machines like GameBoy which bootstrap from a ROM-cartridge!... Homemade ROM-programmers wont most likely do a poor job.Have H.O.P.E.(hold on, pain ends)

author: ali6x944
author_rank: Frequent Contributor
timestamp: July 05, 2017, 09:37:22 am
content: Quote from: legacy on July 03, 2017, 03:25:02 pmwow...gold!amazing work

author: legacy
author_rank: Super Contributor
timestamp: July 05, 2017, 09:47:12 am
content: LOLfunny, but can't you quote the whole forum when you reply ?(p.s. thanks, it's an advice for everybody is looking for "cheap" solution/doesn't want to put money on an ROM/Flash programmer. Say, it's an "option" that one might consider)

author: ali6x944
author_rank: Frequent Contributor
timestamp: July 05, 2017, 03:10:25 pm
content: LOL