Due to voltage drop on internal regulator 78L05, it can temperature overloaded, Vcc and Vpp will drop.Ģ) Note, Jp6 and Jp7 have 4 voltage combinations: 12.5, 15, 21 and 25V. It is better to have less stable voltage (8.9V) than high (11.15). Recomended to have 9-12V 500mA power supply, connector center positive. USB power can't handle required current and voltage drops. 1)Use only external power for old eproms 2716.27256.
Hope images are not annoying.īy: EZo - 12:30:22Your programmer should support old eproms. If this is annoying, please write me on asbesto (at) gmail (dot) com We need this in order to restore some old Commodore PET's for our computer museum Any help is appreciated! Following, images of our programmer. I'm using it under Win XP Home Edition (BLEAH! When a GNU/LINUX Software?!?), with his 'USERPORT.EXE' demon running, and the latest version (0.97G) of EEPROM.EXE.
I made some photos of my programmer, to be more detailed. Software can run on New & Old(Original willem Eprom). Vcc from 5 to 5.5 But what about other settings? What are tWP and tWC, and how to set them for different chips? Also, what is the D5 switch? On manual I can see that Vpp can be from 12.5 to 25V, adjustable by dip switches. Any kind of 27XXXX, with or without 'C' I'm successful in reading them, but there's no way to write on them! Some times I get errors, some times I write garbage, sometime it write and.ĭoes NOTHING! The manual with this programmer (Willem Pro4 ISP from Ebay, Tomsad) it's only a few pages, so there's no support or help. › Willem Pro4 Isp Software ♥ ♥īy: asbesto - 11:19:29Hi all, I'm new in this kind of stuff, so please be patient I'm trying to program some old EPROM, stuff like 2764, 27128, 27256, or 27c512.
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